Lansium domesticum—A Fruit with Multi-Benefits: Traditional Uses, Phytochemicals, Nutritional Value, and Bioactivities

Hossam M Abdallah; Gamal A Mohamed; Sabrin R M Ibrahim

doi:10.3390/nu14071531

. 2022 Apr 6;14(7):1531. doi: 10.3390/nu14071531

Lansium domesticum—A Fruit with Multi-Benefits: Traditional Uses, Phytochemicals, Nutritional Value, and Bioactivities

Hossam M Abdallah ¹, Gamal A Mohamed ^1,^*, Sabrin R M Ibrahim ^2,³

Editor: Winston Craig

PMCID: PMC9002712 PMID: 35406144

Abstract

Lansium domesticum (Langsat, Meliaceae) is a tropical fruit mainly found in Southeast Asian countries, particularly in Thailand, Malaysia, Indonesia, and the Philippines. Traditionally, it is utilized as a folk treatment for eye inflammation, ulcers, diarrhea, dysentery, fever, spasms, flatulence, worms, insect bites, scorpion stings, and malaria. Additionally, it is utilized as a mosquito repellent, skin moisturizer and whitening agent. Pharmacological research showed that the plant has a wide array of bioactivities, including antimalarial, antifeedant, anti-aging, wound healing, antioxidant, cytotoxic, analgesic, antibacterial, antimutagenic, insecticidal, and larvicidal. The most commonly described activities were attributed to the presence of terpenoids and phenolics. Further, some studies reported the preparation of nanoparticles and pharmaceutical formulations from the plant. This review highlights the potential of L. domesticum as herbal medicine. It provides an overview about the reported data on L. domesticum from 1931 to November 2021, including nutritional value, traditional uses, phytoconstituents, and bioactivities, as well as nanoparticles and pharmaceutical formulations.

Keywords: Lansium domesticum, Meliaceae, traditional uses, nutritional value, phytoconstituents, bioactivities

1. Introduction

Fruits, vegetables, and medicinal herbs are the richest sources of health-promoting compounds such as vitamins, β-carotene, minerals, flavonoids, phenolics, and polyphenolics that exert significant bioactivities [1,2]. Genus Lansium belongs to the Meliaceae family, which includes about 560 species and 50 genera that are widespread in tropical and subtropical regions [3]. Genus Lansium commonly recognized species are Lansium breviracemosum Kosterm., L. membranaceum (Kosterm.) Mabb., and L. domesticum Corrêa. [4]. This genus is represented by only one species, L. domesticum, in Peninsular Malaysia [4]. While in Java, it is represented by two species; L. domesticum Corrêa and L. humile Hassk., as well as a variety L. domesticum var. pubescens Koorders et Valeton have been recognized [5,6]. L. domesticum is a common evergreen Southeast Asian tree that occurs both in the wild or cultivated in these regions, where it represents one of the commonly cultivated fruits [7]. It has high market potential and adequate economic value in Southeast Asian countries. Thailand, Malaysia, Indonesia, and the Philippines are considered to be the main producers of L. domesticum. Additionally, the plant is cultivated in Burma, Vietnam, Puerto Rico, Sri Lanka, India, Hawaii, Surinam, and Australia [5,8,9]. L. domesticum Correa is a complicated aggregate species of different plant forms. It’s four prevalent types are Duku, Dokong (longkong), Duku-langsat, and Langsat. Duku and Langsat are the two most common types. Duku-langsat, Langsat, and Duku are domestic to Peninsular Malaysia, however, Dokong is found in southern Thailand and has been cultured in Peninsular Malaysia for >10 years [5,7]. The Duku-langsat is an intermediate type, it is conventionally regarded as uppermost type to both Duku and Langsat [4,7]. L. domesticum includes two botanically distinct varieties; var. pubescens and var. domesticum (Table 1) [10].

Table 1.

Characteristics of the major distinct forms and varieties of L. domesticum.

Forms/Variety	Botanical Characteristics	Ref.
Langsat	Fruits are bunched together ≈ 20 on one brown thick spike up to 20 cm length. Its fruit is oval or round ≈ 2–3 cm long and has a yellowish skin, which when peeled release a latex, showing up a translucent white flesh that is divided into segments and has 1–3 seeds. On ripping, the flesh is fairly aromatic and juicy with a sweet-acidic taste.	[11]
Duku	Fruits are bunched together ≈ 8–12, on one brown thick spike up to 20 cm length. Duku fruit is featured from langsat fruit by its larger size (3–5 cm in diameter), round shape, and much thicker skin that is comparatively free from latex. Also, it is generally more aromatic and sweeter than langsat.	[11]
Dokong (Longkong)	Fruits are occurred in bunches (25–30 fruits/bunch). Its fruit is globular with leathery, thick, and yellow skin, free of latex. The edible portion is juicy and fleshy is thin-skinned, nearly seedless, and free of latex, with uneven five-fragmented translucent white adhering aril. It has a nice aroma with a slightly sour and sweet taste.	[12,13]
Duku-langsat	It is round, brownish-yellow, and intermediate in size. It has a sweet flesh and thinner skin than that of duku.	[5]
L. domesticum var. typica	Inflorescence: rachises, young branchlets, under the surface of leaves, and calyx sparsely pubescent or sub-glabrous. Fruit: oblong-obovoid or ellipsoid, pericarp thin with little milky juice, seeds small, aril thick and smooth.	[14]
L. domesticum var. pubescens Koorders et Valeton	Inflorescence: young branchlets, rachises, calyx densely pubescent, under the surface of leaves. Fruit: sub-globose, pericarp thick with milky copious juice, thin and sour aril, large seeds.	[14]

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The plant has different synonyms; Aglaia domestica (Correa) Pellegrin, A. aquea (Jack) Kosterm., A. intricatoreticulata Kosterm., A. dookoo Griff., A. merrillii Elmer, A. steenisii Kosterm., A. sepalina (Kosterm.) Kosterm., Lachanodendron domesticum Nees, Lansium domesticum var. aqueum Jack, L. aqueum (Jack) M.Roem., L. domesticum var. typicum Backer, L. domesticum var. pubescens Koord. & Valet., L. javanicum M. Roem., L. javanicum Koord. & Valet. ex Moll & Janss., L. parasiticum var. aqueum (Jack) Sahni & Bennet, L. sepalinum Kosterm, L. parasiticum Sahni & Bennet, L. pedicellatum Kosterm., and Taeniochlaena polyneura Schellenberg. Additionally, different local names have been given for L. domesticum [5,15,16] (Table 2).

Table 2.

Different local names of L. domesticum according to the nationality [5,14,15,16].

Nationality	Name
English	Langsat, Duku
Burmese	Duku, Langsak
Filipino	Lanzone, Buahan, Lansones, Lanzon, Lansone
Indonesian	Langsat, Kokosan, Lanset Duku, Langsa, Lansot, Lasa, Lansat
Italian	Lansio, Lanzone
Malay	Langseh, Lansa, Langsep, Kokosan, Pijitan
Thai	Longkong, Duku, Langsat
Vietnamese	Bo‘N-Bon
Chinese	Lan Sa, Lan Sa Guo
Japanese	Ransa
Spanish	Arbol De Lanza, Lanzón
Portuguese	Arbol-Do-Lanza
Surinam	Duki
Malaysia	Dokong, Duku Hutan, Duku, Duku-Langsat, Langsat-Hutan, Longkong, Langsat
Korean	Lang Sat
Danish	Langsat, Langsep
French	Lansium, Langsep
Dutch	Doekoe, Langsep
Costa Rica	Duki
Cuba	Duku, Kokosan
German	Doko, Echter-Lanzebaum, Duku, Lansabaum, Langsta, Lansibaum
Honduras	Duki
Taiwan	Lan sa guo
Kenya	lengeset
Sundanese	Kokosan, Pisitan
Javanese	Langsep, langsat, celoring
Madurese	Langsep

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Its tree has a 40–50 ft height with long leaves which are dark green and pinnate with a glossy surface. The flowers are present in clusters on the old branches and trunk of the tree. They are mostly bisexual, small with a yellow-white color. The fruits grow in clusters and are small, round (3–5 cm diameter) with a leathery yellow skin that can be thin or thick. The fruit’s flesh is translucent and juicy with six or five segments which have seeds. The fruits may be sweet or acidic relying on the growing conditions and variety [5]. The delicious, succulent, fruit aril is eaten fresh directly after peeling or can also be candied or preserved in syrup [5,17,18]. The jams, juices, sherbet, and ice creams are the most popular langsat products. On the contrary, the seeds and peel are the main byproducts after the flesh’s consumption, neither of which are widely used. However, the seeds and peels are a rich pool of bio-metabolites [12]. In Indonesia, the fruit is a very popular dessert, and the peel was traditionally known to be toxic to domestic animals [19]. The plant extracts exhibited various biological activities, including antimalarial, antifeedant, anti-aging, wound healing antioxidant, cytotoxic, analgesic, antibacterial, antimutagenic, insecticidal, and larvicidal. Phytochemical studies of L. domesticum indicated that triterpenoids particularly onoceranoids with unusual and unrivaled skeleton, cycloartenoid, and tetranortriterpenoid are the main constituents reported from this plant that displayed remarkable bioactivities.

In recent decades, herbal medicines have substantiated their publicity among consumers for both traditional and cultural reasons. Herbal medicines have been utilized for treating various ailments and diseases in many populations for thousands of years. They are considered the main treatment approach in many countries because of their safety, reliability, and affordability in comparison to synthetic ones that can cause adverse effects on human health. L. domesticum has immense role in providing medicinal and realistic value in many developing countries particularly in regions where medicine is unreachable, and the populations are in the need of healthcare. Thus, this review is aimed at describing and summarizing the studies on L. domesticum, including traditional uses, nutritional value, phytoconstituents, and bioactivities, as well as the production and season and nanoparticles and pharmaceutical formulations. The cited literature in the current work is dated from 1931 to November 2021.

2. Research Methodology

The reported data about L. domesticum was obtained through searching in various databases, including Web of Science, PubMed, Scopus, and Google scholar. Moreover, published papers in different publishers such as ACS, Elsevier, Bentham, Sage, Wiley, Taylor &Francis, Thieme Medical, and Springer were surveyed. Further, non-English papers, theses, conferences, and symposiums have been reviewed. The used keywords include L. domesticum, traditional uses, phytochemistry, bioactive compounds, pharmacology, and other related words. All of the conducted research from 1931 to 2021 has been reviewed.

3. Production and Season

Generally, L. domesticum produces fruit once and sometimes twice a year with differences in fruiting periods according to the area. In Malaya, it bears fruits twice a year, in June and July and again in December and January or even till February. In Indonesia, the plant is available anywhere during the rainy season (January to April) [19]. In the Philippines, the season is short and most of the fruits are off the market in >1 month, however, in India, the fruits become mature between April and September [20]. Its harvest season in Thailand is commonly between August and September of each year. Its production often varies from year to year, relying on the existence of a dry period for inducing flowering. The average production is only 1 ton/rai/year in Thailand. In Indonesia, the production reached 228,817 tons which placed it in the twelfth position of fruit production. In Southern Sumatra, the production reached 8419.1 tons in 2011 [21]. On the other hand, the average production was 1000 fruits/tree/year in the Philippines and an average 13.5 kg/trees produced annually in Nilgiris, India [20].

4. Traditional Uses of L. domesticum

The different parts of L. domesticum have various medicinal and non-medicinal uses in many nationalities (Table 3). The peel is wealthy in non-toxic oleoresin that is utilized against diarrhea and fevers [8]. In Thailand, the peel and flesh have been used as facial toners, wash gels, and masks, as well as a skin moisturizer and whitening cream. Additionally, the seeds possess antifeedant and febrifugal capacities and pericarp is utilized for repelling mosquitoes [22,23]. L. domesticum bark was used by people in the Pakuli region of Palu for malaria treatment. Moreover, the boiled bark with water was utilized to reduce pain and fever [24].

Table 3.

Non-medicinal and medicinal uses of L. domesticum.

Forms/Variety	Botanical Characteristics	Ref.
Fruit peels	In Java, it is dried and burned as incense in the sick people’s rooms and to repel mosquitoes. It is utilized to cure diarrhea and intestinal parasites. Fruit peels are used as an arrow poison.	[25,26]
	It is applied to the skin as a moisturizer and skin whitening cream. Borneo, it is utilized as talc powder by indigenous females of Dayak for skin protection from the sun.	[10,27]
Seeds	Pulverized seeds mixed with water are utilized as a vermifuge for children. Also, they are utilized as a febrifuge. In Peninsular Malaysia, among the Sakai the bitter seeds were crushed and utilized for curing fevers. In the Philippines, pounded seeds mixed with water are used for deworming and ulcers.	[22,23,28]
Bark	A poultice of bark used against scorpion stings. A decoction is taken for malaria and dysentery treatment in Java, Borneo, and Malaya. A tincture is useful as an anti-colic or anti-diarrhetic. In Kenya, the bark is used for spleen and fever. In Borneo, bark stew water decoction is taken by rural communities as an antifertility medicine.	[8,17,26,29,30,31]
Resin	It halts diarrhea and intestinal spasms. The resin from the bark is given for swellings, flatulence, and spasm.	[8]
Leaf	Its juice is utilized as eye drops to eleminate inflammation. A decoction of leaves and bark has been taken for curing dysentery. The Philippines used leaves for the control of mosquitoes. In Ibans in Sarawak, Malaysia leaves are used to treat fever.	[26,32,33]
Peel and flesh	It is used as facial masks, wash gels, and toners. Peel is known to be toxic to domestic animals.	[10,34]
Wood tar	It is used for blackening teeth.	[5]
Wood	It is used for tool handles, house posts, and rafters	[16]
Bark and fruit	The fruit skin‘s juice and bark are utilized as a Dyak arrow poison.	[5]
Seed and bark	A decoction of seed and bark is used for the enlargement of spleen and fever in Kenya.	[30]
Stem	The decoction of the langsat stems and bark of Pterocarpus indica assists treating dysentery.	[35]

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5. Nutritional Value of L. domesticum

The fruit tastes sweet and sour. It has a sour taste due to its low pH at about 3.85 that is aligns with the reported total acidity of fruit ≈1.04% [36]. Its taste has been resembled to a combination of grapefruit and grape and is considered excellent by most people. Its fructose, sucrose, and glucose contents are accountable for the sweet taste [37]. The fruit is a prosperous source of minerals, fats, protein, organic acids, carbohydrates, fiber, and vitamins. Various studies reported the evaluation of the nutritional value of this fruit. Chemical composition and mineral contents of flesh, peel, and seed of a fruit sample collected from Kuala Terengganu, Malaysia using ICP-OES (inductively couple plasma optical emission spectrometry) were previously evaluated [38]. The seeds had the highest crude protein (3.0 g/100 g), carbohydrates, and sodium, whereas the peels possessed high contents of crude fat, ash, calcium, potassium, and magnesium [38]. Furthermore, the seeds are rich in starch. Additionally, it was reported that the seeds and peels could have higher nutrient contents than pulp fruits [39]. In Thailand, the nutrient composition per100 g langsat fruit had energy (66 cal), moisture (82.9%), protein (0.9 g), fat (0.1 g), fibre (0.3 g), carbohydrate (15.3 g), Ca (5 mg), Fe (0.7 mg), P (35 mg), vitamin A (15 I.U.), vitamin B2 (0.02 mg), vitamin B1 (0.08 mg), niacin (0.1 mg), and vitamin C (46 mg) [40]. In addition, it was found that 100 g edible portion of duku showed 34 kcal energy, 90 g water, 0.4 g protein, 0.0 g fat, 8.2 g carbohydrate, 0.9 g fiber, 0.5 g ash, 10 mg Ca, 20 mg P, 1.0 mg Fe, 12 mg Na, 230 mg K, 0.05 mg vitamin B1, 0.02 mg vitamin B2, 0.5 mg niacin, and 13.4 mg vitamin C [41]. Meanwhile, 100 g longkong fruit flesh contained protein 1.0 g and crude fat 0.5 g, which are higher than that of duku and langsat fruit [18,42]. Moreover, 100 g of longkong contains water 84 g, fiber 0.8 g, carbohydrates 14.2 g, Ca 19 mg, ash 0.6 g, K 275 mg, and vitamins (B2, B1, and C). The energy value is 238 kJ/100 g [16,43,44]. It is noteworthy that sodium, magnesium, potassium, zinc, calcium, iron, and manganese are the major minerals in the fruit [12,45].

6. L. domesticum Enzymes

Enzymes are important biocatalysts in food biotechnology. Plant-derived enzymes (e.g., bromelain, invertase, amylase, papain, ficin, lipoxygenase, etc.) have played a remarkable role in various food industries, for example, dairy and bakery products, syrups, and alcoholic beverages. Besides, the plants can also be used as raw materials for enhancing the potential of the microbial enzyme that are employed in the food industry. L. domesticum fruit and pericarp are wealthy, with different active enzymes. On the other hand, these enzymes could contribute to the spoilage of the fruit. The fruits activated these enzymes for protection when they suffer from changes in the environment and/or storage temperature [12]. For example, oxidoreductases are activated when the peel or fruit is damaged. Phenylalanine ammonia-lyase, polyphenol oxidase, and peroxidase that are found in the pericarp oxidize the phenols to yield browning compounds [46,47]. Chitinase and β-1,3-glucanase are reported from the fruit peel that possessed antifungal potential towards Metarhizium guizhouense [48]. Polygalacturonase (PG) and pectin methylesterase (PME), as well as antioxidant enzymes: GPX (glutathione peroxidase), SOD (superoxide dismutase), and catalase (CAT) were detected in fully matured fruit that possessed high activities during fruit maturation [49]. Furthermore, the fruit had LOX (lipoxygenase) that is accountable for the polyunsaturated fatty acids deoxygenation and converting them into fragrance and signaling molecules for regulating leukotriene [50]. It was reported that polygalacturonase, pectin methylesterase, and cellulases rise the sugar profile in the fruit and decrease the firmness of the fruit during ripening [49].

7. Phytoconstituents of L. domesticum

The chemical investigation of various parts of L. domesticum resulted in the isolation of different chemical constituents; most of them have been isolated from the peels, seeds, and barks (Table 4). Their identification was carried out using various spectroscopic techniques, as well as X-ray and chemical means. A total of 112 compounds have been reported from L. domesticum (excluding nutrients such as amino acids, protein, and sugars), including various classes of triterpenoids (e.g., swietenine, onoceranoid, cycloatanoid, and tetranortriterpenoid), cardenolides, steroids, sesquiterpenes, organic acids, phenolics, and volatile compounds. It was reported that the fruit peel had an abundant level of reductive substances, glycosides, organic acids, alkaloids, flavonoids, and phenolics, but it had no saponins [51,52]. Phytochemical screening of the bark revealed the existence of anthraquinones, alkaloids, flavonoids, coumarins, cardiac glycosides, tannins, saponins, and iridoids [24]. Further, a toxic constituent such as lansium acid (6%) was detected in the peel [52,53]

Table 4.

List of the reported phytoconstituents from Lansium domesticum.

Compound Name	Chemical Class	Plant Part	Extract/ Fraction	Mol. Wt.	Mol. Formula	City, Country	Ref.
Germacrene D (1)	Sesquiterpene	Fruits	Essential oil	204	C₁₅H₂₄	Seepoa village, Narathiwat, Thailand	[57]
		Fruits	Essential oil	-	-	Penang, Malaysia	[11]
		Seeds	CH₂Cl₂/acetone	204	C₁₅H₂₄	Laguna, Philippine	[58]
3-Carene (2)	Monterpene	Fruits	Juice	136	C₁₀H₁₆	Eastern Thailand	[56]
δ-Selinene (3)	Sesquiterpene	Fruits	Juice	204	C₁₅H₂₄	Eastern Thailand	[56]
1,3,5-Trioxane (4)	Organic compound	Fruits	Juice	90	C₃H₆O₃	Eastern Thailand	[56]
(E)-2-Hexenal (5)	Aldehyde	Fruits	Juice	98	C₆H₁₀O	Eastern Thailand	[56]
α-Cubebene (6)	Sesquiterpene	Young fruit	CHCl₃	204	C₁₅H₂₄	Narathiwat, Satun, and Yala, Thailand	[43]
α-Cubebene (6)		Fruits	Juice	-	-	Eastern Thailand	[56]
Isoledene (7)	Sesquiterpene	Fruits	Juice	204	C₁₅H₂₄	Eastern Thailand	[56]
α-Calacorene (8)	Sesquiterpene	Fruits	Juice	200	C₁₅H₂₀	Eastern Thailand	[56]
Ethyl oleate (9)	Fatty acid ester	Young fruit	CHCl₃	310	C₂₀H₃₈O₂	Narathiwat, Satun, and Yala, Thailand	[43]
Hexadecenoic acid (10)	Fatty acid	Young fruit	CHCl₃	254	C₁₆H₃₀O₂	Narathiwat, Satun, and Yala, Thailand	[43]
1,2,4a,5,6,8a-Hexahydro-4,7-dimethyl-1-(1-methylethyl)-naphthalene (11)	Sesquiterpene	Young fruit	CHCl₃	204	C₁₅H₂₄	Narathiwat, Satun, and Yala, Thailand	[43]
Octadecanoic acid (12)	Fatty acid	Young fruit	CHCl₃	284	C₁₈H₃₆O₂	Narathiwat, Satun, and Yala, Thailand	[43]
α-Copaene (13)	Sesquiterpene	Fruits	Essential oil	204	C₁₅H₂₄	Seepoa village, Narathiwat, Thailand	[57]
Oleic acid (14)	Fatty acid	Fruits	MeOH	282	C₁₈H₃₄O₂	Seepoa village, Narathiwat, Thailand	[57]
δ-Cadinene (15)	Sesquiterpene	Fruits	Essential oil	204	C₁₅H₂₄	Seepoa village, Narathiwat, Thailand	[57]
τ-Muurolol (16)	Sesquiterpene	Fruits	Essential oil	222	C₁₅H₂₆O	Seepoa village, Narathiwat, Thailand	[57]
Palmitic acid (17)	Fatty acid	Fruits	MeOH	256	C₁₆H₃₂O₂	Seepoa village, Narathiwat, Thailand	[57]
(+)-Spathulenol (18)	Sesquiterpene	Fruits	Essential oil	220	C₁₅H₂₄O	Seepoa village, Narathiwat, Thailand	[57]
Citric acid (19)	Organic acid	Fruits	H₂O	192	C₆H₈O₇	North Sulawesi, Indonesia	[36]
Malic acid (20)	Organic acid	Fruits	H₂O	134	C₄H₆O₅	North Sulawesi, Indonesia	[36]
Piroglutamic acid (21)	Organic acid	Fruits	H₂O	129	C₅H₇NO₃	North Sulawesi, Indonesia	[36]
Ascorbic acid (22)	Organic acid	Fruits	H₂O	176	C₆H₈O₆	North Sulawesi, Indonesia	[36]
Glycolic acid (23)	Organic acid	Fruits	MeOH	76	C₂H₄O₃	Seepoa village, Narathiwat province, Thailand	[57]
Maleic acid (24)	Organic acid	Fruits	MeOH	116	C₄H₄O₄	Seepoa village, Narathiwat province, Thailand	[57]
Ferulic acid (25)	Phenolic acid	Fruits	MeOH	194	C₁₀H₁₀O₄	Singapore	[59]
P-Coumaric acid (26)	Phenolic acid	Fruits	MeOH	164	C₉H₈O₃	Singapore	[59]
Gallic acid (27)	Phenolic acid	Fruits	MeOH	170	C₇H₆O₅	Singapore	[59]
Ellagic acid (28)	Phenolic acid	Fruits	MeOH	302	C₁₄H₆O₈	Singapore	[20]
Chlorogenic acid (29)	Phenolic acid	Fruit peels	LDSK50-EA LDSK50-H₂O	354	C₁₆H₁₈O₉	Prathumthani, Thailand	[51]
Rutin (30)	Flavonoid	Fruit peels	LDSK50-EA LDSK50-H₂O	610	C₂₇H₃₀O₁₆	Prathumthani, Thailand	[51]
Scopoletin (31)	Coumarin	Fruit peels	LDSK50-EA LDSK50-H₂O	192	C₁₀H₈O₄	Prathumthani, Thailand	[51]
Quercetin (32)	Flavonoid	Fruit peels	LDSK50-EA LDSK50-H₂O	302	C₁₅H₁₀O₇	Prathumthani, Thailand	[51]
Catechin (33)	Flavonoid	Fruit peels	LDSK50-EA LDSK50-H₂O	290	C₁₅H₁₄O₆	Prathumthani, Thailand	[51]
Lansic acid (34)	Onoceranoid triterpenoid	Fruit peels	EtOH/CH₂Cl₂	470	C₃₀H₄₆O₄	Bogor, Indonesis	[19,60]
	Onoceranoid triterpenoid	Fruit peels	MeOH/EtOAc	-	-	Khon Kaen, Thailand	[61]
	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	-	-	Ba’kelalan, Sarawak, Malaysia	[62]
Lansioside A (35)	Onoceranoid triterpenoid	Fruit peels	EtOH/CH₂Cl₂	659	C₃₈H₆₁NO₈	Bogor, Indonesia	[19,60,63]
	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	-	-	Ba’kelalan, Sarawak, Malaysia	[62]
	Onoceranoid triterpenoid	Fruit peels	EtOH	-	-	Japan	[64]
Lansioside B (36)	Onoceranoid triterpenoid	Fruit peels	EtOH/CH₂Cl₂	618	C₃₆H₅₈O₈	Bogor, Indonesia	[19,60]
	Onoceranoid triterpenoid	Fruit peels	EtOH	-	-	Japan	[64]
	Onoceranoid triterpenoid	Seeds	CH₂Cl₂/EtOAc	-	-	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	-	-	Ba’kelalan, Sarawak, Malaysia	[62]
Lansioside C (37)	Onoceranoid triterpenoid	Fruit peels	EtOH/CH₂Cl₂	588	C₃₅H₅₆O₇	Bogor, Indonesia	[19,60]
	Onoceranoid triterpenoid	Fruit peels	EtOH	-	-	Japan	[64]
	Onoceranoid triterpenoid	Fruit peels	CH₂Cl₂/EtOAc	-	-	Laguna, Philippine	[58]
	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	-	-	Ba’kelalan, Sarawak, Malaysia	[62]
Methyl lansiolate (38)	Onoceranoid triterpenoid	Fruit peels	EtOH/CH₂Cl₂	470	C₃₁H₅₀O₃	Bogor, Indonesia	[19]
	Onoceranoid triterpenoid	Fruit peels	MeOH/EtOAc	-	-	Ra-ngae, Narathiwat, Thailand	[66]
	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	-	-	Ba’kelalan, Sarawak, Malaysia	[62]
Lansiolic acid (39)	Onoceranoid triterpenoid	Fruit peels	EtOH/CH₂Cl₂	456	C₃₀H₄₃O₃	Bogor, Indonesia	[19]
	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	454	C₃₀H₄₆O₃	Indonesia	[67]
	Onoceranoid triterpenoid	Fruit peels and seeds	CH₂Cl₂/EtOAc	-	-	Laguna, Philippine	[58]
	Onoceranoid triterpenoid	Seeds	CH₂Cl₂/EtOAc	-	-	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
	Onoceranoid triterpenoid	Bark	EtOH/EtOAc	-	-	Apo Kayan Indonesia	[68]
	Onoceranoid triterpenoid	Fruit peels	MeOH/EtOAc	-	-	Ra-ngae, Narathiwat, Thailand	[66]
	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	-	-	Ba’kelalan, Sarawak, Malaysia	[62]
Dukunolide A (40)	Tetranortriterpenoid	Seeds	CH₂Cl₂/n-Hexane (Duku)	482	C₂₆H₂₆O₉	Bogor, Indonesia	[69,70]
Dukunolide A (40)		Seeds	MeOH/EtOAc	-	-	Pontianak, West Kalimantan, Indonesia	[71]
Dukunolide B (41)	Tetranortriterpenoid	Seeds	CH₂Cl₂/n-Hexane	498	C₂₆H₂₆O₁₀	Bogor, Indonesia	[70]
		Seeds	CH₂Cl₂/EtOAc	-	-	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
		Seeds	MeOH/EtOAc	-	-	Pontianak, West Kalimantan, Indonesia	[71]
Dukunolide C (42)	Tetranortriterpenoid	Seeds	CH₂Cl₂/n-Hexane	540	C₂₈H₂₈O₁₁	Bogor, Indonesia	[70]
		Seeds	CH₂Cl₂/EtOAc	-	-	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
		Seeds	MeOH/EtOAc	-	-	Pontianak, West Kalimantan, Indonesia	[71]
Dukunolide D (43)	Tetranortriterpenoid	Seeds	CH₂Cl₂/n-Hexane	468	C₂₆H₂₈O₈	Bogor, Indonesia	[72]
		Seeds	CH₂Cl₂/EtOAc	-	-	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
		Seeds	MeOH/EtOAc	-	-	Pontianak, West Kalimantan, Indonesia	[71]
Dukunolide E (44)	Tetranortriterpenoid	Seeds	CH₂Cl₂/n-Hexane	484	C₂₆H₂₈O₉	Bogor, Indonesia	[72]
Dukunolide F (45)	Tetranortriterpenoid	Seeds	CH₂Cl₂/n-Hexane	484	C₂₆H₂₈O₉	Bogor, Indonesia	[72]
Dukunolide F (45)		Seeds	MeOH/EtOAc	-	-	Pontianak, West Kalimantan, Indonesia	[71]
Seco-Dukunolide F (46)	Tetranortriterpenoid	Seeds	CH₂Cl₂/n-Hexane	500	C₂₇H₃₂O₉	Nakhon Si Thammarat, Thailand	[73]
Seco-Dukunolide F (46)		Seeds	MeOH/EtOAc	-	-	Pontianak, West Kalimantan, Indonesia	[71]
Kokosanolide A (47)	Tetranortriterpenoid	Seeds	CH₂Cl₂/n-Hexane	500	C₂₇H₃₂O₉	Malaysia	[74]
Kokosanolide A (47)		Seeds	MeOH/n-Hexane	-	-	Cililin, Bandung, Indonesia	[75]
Kokosanolide B (48)	Tetranortriterpenoid	Bark	MeOH/n-Hexane	456	C₃₀H₄₈O₃	Cililin, Bandung, Indonesia	[76]
		Bark	MeOH/EtOAc	-	-	Cililin, Bandung, Indonesia	[75]
		Bark	MeOH/EtOAc	-	-	Cililin, Bandung, Indonesia	[77]
Kokosanolide C (49)	Tetranortriterpenoid	Seeds	MeOH/n-Hexane	486	C₂₇H₃₄O₈	Cililin, Bandung, Indonesia	[75]
Kokosanolide D (50)	Tetranortriterpenoid	Fruit peels	MeOH/n-BuOH (Kokossan)	516	C₂₇H₃₂O₁₀	Cililin, Bandung, Indonesia	[78]
8,14-Secogammacera-7,14-diene-3,21-dione (51)	Tetranortriterpenoid	Bark	MeOH/n-Hexane	438	C₃₀H₄₆O₂	Cililin, Bandung, Indonesia	[79]
		Bark	MeOH/EtOAc	-	-	Cililin, Bandung, Indonesia	[75]
		Bark	MeOH/EtOAc	-	-	Cililin, Bandung, Indonesia	[77]
		Leaves	MeOH/EtOAc	-	-	Ba’kelalan, Sarawak, Malaysia	[62]
α,γ-Onoceradienedione = 8,14-Secogammacera-7,14(27)-diene-3,21-dione (52)	Onoceranoid triterpenoid	Fruit peels	CH₂Cl₂/EtOAc	438	C₃₀H₄₆O₂	Laguna, Philippine	[58]
		Bark	EtOH/EtOAc	-	-	Apo Kayan Indonesia	[34,68]
		Bark	MeOH/n-Hexane	438	C₃₀H₄₆O₂	Cililin, Bandung, Indonesia	[79]
		Fruit peels	MeOH/n-Hexane	-	-	Nganjuk, East Java, Indonesia	[80]
24(E)-Cyclolanost-24-en-3-one, 21,23-epoxy-21,22-dihydroxy (21R,22S,23S) (53)	Cycloartane triterpenoid	Leaves	MeOH/EtOAc (kokossan)	470	C₃₀H₄₆O₄	Cililin, Bandung, Indonesia	[81]
		Bark	MeOH/EtOAc	-	-	Cililin, Bandung, Indonesia	[75]
		Leaves	MeOH/EtOAc	-	-	Cililin, Bandung, Indonesia	[77]
3-Oxo-α-bourbonene (54)	Sesquiterpene	Fruit peels	-	218	C₁₅H₂₂O	-	[82]
Stigmasterol (55)	Sterol	Peel	Hexane/CH₂Cl₂	412	C₂₉H₄₈O	-	[83]
β-Sitosterol (56)	Sterol	Peel	Hexane/CH₂Cl₂	414	C₂₉H₅₀O	-	[83]
4-Hydroxy-N-methylproline (57)	Nitrogenous compound	Fruit peels	MeOH	145	C₆H₁₁NO₃	Bogor, Indonesis	[84]
Domesticulide A (58)	Tetranortriterpenoid	Seeds	CH₂Cl₂/EtOAc	486	C₂₇H₃₄O₈	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
Domesticulide B (59)	Tetranortriterpenoid	Seeds	CH₂Cl₂/EtOAc	528	C₂₉H₃₆O₉	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
Domesticulide C (60)	Tetranortriterpenoid	Seeds	CH₂Cl₂/EtOAc	560	C₂₉H₃₆O₁₁	Thumbon Nopitum, Nakhon Si Thammasat, Thailand	[65]
Domesticulide D (61)	Tetranortriterpenoid	Seeds	CH₂Cl₂/EtOAc	560	C₂₉H₃₆O₁₁	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
Domesticulide E (62)	Tetranortriterpenoid	Seeds	CH₂Cl₂/EtOAc	516	C₂₇H₃₂O₁₀	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
6-Hydroxymexicanolide (63)	Swietenine triterpenoid	Seeds	CH₂Cl₂/n-Hexane	484	C₂₇H₃₂O₈	Thailand	[85]
6-Hydroxymexicanolide (63)		Seeds	CH₂Cl₂/EtOAc	-	-	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
6-Acetoxymexicanolide = Ekeberin C₃ (64)	Tetranortriterpenoid	Seeds	CH₂Cl₂/EtOAc	526	C₂₉H₃₄O₉	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
		Leaves	EtOH/EtOAc			Menglun town of Yunnan, China	[86]
Methyl angolensate (65)	Tetranortriterpenoid	Seeds	CH₂Cl₂/EtOAc	470	C₂₇H₃₄O₇	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
Methyl 6-hydroxyangolensate (66)	Tetranortriterpenoid	Seeds	CH₂Cl₂/EtOAc	486	C₂₇H₃₄O₈	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
Methyl 6-acetoxyangolensate (67)	Tetranortriterpenoid	Seeds	CH₂Cl₂/EtOAc	528	C₂₉H₃₆O₉	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
Azadiradione (68)	Tetranortriterpenoid	Seeds	CH₂Cl₂/EtOAc	450	C₂₈H₃₄O₅	Thumbon Nopitum, Nakhon Si Thammarat, Thailand	[65]
Onoceratriene (69)	Onoceranoid triterpenoid	Bark	EtOH/EtOAc	408	C₃₀H₄₈	Apo Kayan Indonesis	[34,68]
Lansionic acid = 3-Ketolansiolic acid (70)	Onoceranoid triterpenoid	Fruit peels	MeOH/EtOAc	454	C₃₀H₄₆O₃	Khon Kaen, Thailand	[61]
		Fruit peels	CH₂Cl₂/EtOAc	-	-	Laguna, Philippine	[58]
		Bark	EtOH/EtOAc	-	-	Apo Kayan Indonesis	[34,68]
		Fruit peels	MeOH/EtOAc	-	-	Ra-ngae, Narathiwat, Thailand	[66]
Lansionic acid A = Lansiolic acid A (71)	Onoceranoid triterpenoid	Bark	EtOH/EtOAc	470	C₃₀H₄₆O₄	Apo Kayan Indonesis	[34,68]
Lansionic acid A = Lansiolic acid A (71)		Leaves	MeOH/EtOAc	-	-	Ba’kelalan, Sarawak, Malaysia	[62]
21α-Hydroxyonocera-8(26),14-dien-3-one = 3-keto-22-hydroxyonoceradiene (72)	Onoceranoid triterpenoid	Fruit peels	MeOH/EtOAc	440	C₃₀H₄₈O₂	Khon Kaen, Thailand	[61]
		Bark	EtOH/EtOAc	-	-	Apo Kayan Indonesis	[34,68]
Methyl lansionate A = methyl lansiolate A (73)	Onoceranoid triterpenoid	Bark	EtOH/EtOAc	484	C₃₁H₄₈O₄	Apo Kayan Indonesis	[68]
8,14-Secogammacera-14-hydroxy-7-ene-3,21-dione (74)	Tetranortriterpenoid	Bark	MeOH/EtOAc	456	C₃₀H₄₈O₃	Cililin, Bandung, Indonesia	[75]
Lansium acid I (75)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	470	C₃₀H₄₆O₄	Ba’kelalan, Sarawak, Malaysia	[62]
Lansium acid II (76)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	486	C₃₀H₄₆O₅	Ba’kelalan, Sarawak, Malaysia	[62]
Lansium acid III (77)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	468	C₃₀H₄₄O₄	Ba’kelalan, Sarawak, Malaysia	[62]
Lansium acid IV (78)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	470	C₃₀H₄₆O₄	Ba’kelalan, Sarawak, Malaysia	[62]
Lansium acid V (79)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	504	C₃₀H₄₈O₆	Ba’kelalan, Sarawak, Malaysia	[62]
Lansium acid VI (80)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	604	C₃₅H₅₆O₈	Ba’kelalan, Sarawak, Malaysia	[62]
Lansium acid VII (81)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	620	C₃₅H₅₆O₉	Ba’kelalan, Sarawak, Malaysia	[62]
Lansium acid VIII (82)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	691	C₃₈H₆₁NO₁₀	Ba’kelalan, Sarawak, Malaysia	[62]
Lansium acid IX (83)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	620	C₃₅H₅₆O₉	Ba’kelalan, Sarawak, Malaysia	[62]
Ethyl lansiolate (84)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	484	C₃₂H₅₂O₃	Ba’kelalan, Sarawak, Malaysia	[62]
Lamesticumin A (85)	Onoceranoid triterpenoid	Twigs	EtOH/EtOAc	502	C₃₁H₅₀O₅	Xishuangbanna, Mengla, Yunnan, China	[87]
		Leaves	MeOH/EtOAc	-	-	Ba’kelalan, Sarawak, Malaysia	[62]
		Fruit peels	EtOAc/n-Hexane	-	-	Bantul, Yogyakarta, Indonesia	[35]
Lansium acid X (86)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	470	C₃₀H₄₆O₄	Ba’kelalan, Sarawak, Malaysia	[88]
Lansium acid XI (87)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	673	C₃₈H₅₉NO₉	Ba’kelalan, Sarawak, Malaysia	[88]
Lansium acid XII (88)	Onoceranoid triterpenoid	Leaves	MeOH/EtOAc	604	C₃₅H₅₆O₈	Ba’kelalan, Sarawak, Malaysia	[88]
Lansium acid XIII (89)	Cycloartane triterpenoid	Leaves	MeOH/EtOAc	470	C₃₀H₄₆O₄₄	Ba’kelalan, Sarawak, Malaysia	[88]
3β-Hydroxyonocera-8(26),14-dien-21-one (90)	Onoceranoid triterpenoid	Fruit peels	MeOH/EtOAc	440	C₃₀H₄₈O₂	Khon Kaen, Thailand	[61]
		Fruit peels	CH₂Cl₂/EtOAc	-	-	Laguna, Philippine	[58]
		Fruit peels	MeOH/EtOAc	-	-	Ra-ngae, Narathiwat, Thailand	[66]
3-Hydroxy-8,14-secogammacera-7,14-dien-21-one (91)	Onoceranoid triterpenoid	Fruit peels	n-Hexane/EtOAc	440	C₃₀H₄₈O₂	Cililin, West Java, Indonesia	[89]
3-Oxo-24-cycloarten-21-oic acid (92)	Cycloartane triterpenoid	Leaves	MeOH/EtOAc	454	C₃₀H₄₆O₃	Indonesia	[67]
Obebioside A (93)	Cardenolide	Leaves	MeOH/EtOAc	696	C₃₆H₅₆O₁₃	Thailand	[90]
Obebioside B (94)	Cardenolide	Leaves	MeOH/EtOAc	754	C₃₈H₅₈O₁₅	Thailand	[90]
Honghelin (95)	Cardenolide	Leaves	MeOH/EtOAc	534	C₃₀H₄₆O₈	Thailand	[90]
Obeside B (96)	Cardenolide	Leaves	MeOH/EtOAc	592	C₃₂H₄₈O₁₀	Thailand	[90]
Obeside C (97)	Cardenolide	Leaves	MeOH/EtOAc	550	C₃₀H₄₆O₉	Thailand	[90]
Digitoxigenin (98)	Cardenolide	Leaves	MeOH/EtOAc	374	C₂₃H₃₄O₄	Thailand	[90]
2-Ethyl,l,3-(2‘-menthene) propenal (99)	Sesquiterpene	Fruit peels	EtOAc/n-Hexane	220	C₁₅H₂₄O	Purbalingga, Central Java, Indonesia	[91]
Lamesticumin G (100)	Onoceranoid triterpenoid	Fruit peels	MeOH/EtOAc	452	C₃₀H₄₄O₃	Ra-ngae, Narathiwat, Thailand	[66]
17(20)E-Dyscusin B (101)	Pregnane	Leaves	EtOH/EtOAc	330	C₂₁H₃₀O₃	Menglun town of Yunnan, China	[86]
17(20)Z-Dyscusin B (102)	Pregnane	Leaves	EtOH/EtOAc	330	C₂₁H₃₀O₃	Menglun town of Yunnan, China	[86]
3-Oxoanticopalic acid methyl ester (103)	Diterpene	Leaves	EtOH/EtOAc	332	C₂₁H₃₂O₃	Menglun town of Yunnan, China	[86]
(23R)-3-Oxo-5α-cycloart-24-en-21,23-olide (104)	Cycloartane triterpenoid	Leaves	MeOH/EtOAc	452	C₃₀H₄₄O₃	Menglun town of Yunnan, China	[86]
Lansioside D (105)	Onoceranoid triterpenoid	Fruit peels	EtOH/Acetone	646	C₃₇H₅₈O₉	Laguna, Philippines	[92]
Lamesticumin B (106)	Onoceranoid triterpenoid	Twigs	EtOH/EtOAc	488	C₃₁H₅₂O₄	Xishuangbanna, Mengla, Yunnan, China	[87]
Lamesticumin C (107)	Onoceranoid triterpenoid	Twigs	EtOH/EtOAc	454	C₃₀H₄₆O₃	Xishuangbanna, Mengla, Yunnan, China	[87]
Lamesticumin D (108)	Onoceranoid triterpenoid	Twigs	EtOH/EtOAc	454	C₃₀H₄₆O₃	Xishuangbanna, Mengla, Yunnan, China	[87]
Lamesticumin E (109)	Onoceranoid triterpenoid	Twigs	EtOH/EtOAc	484	C₃₁H₄₈O₄	Xishuangbanna, Mengla, Yunnan, China	[87]
Lamesticumin F (110)	Onoceranoid triterpenoid	Twigs	EtOH/EtOAc	458	C₃₀H₅₀O₃	Xishuangbanna, Mengla, Yunnan, China	[87]
Langsatide A (111)	Tetranortriterpenoid	Seeds	MeOH/EtOAc	526	C₂₉H₃₄O₉	Pontianak, West Kalimantan, Indonesia	[71]
Langsatide B (112)	Tetranortriterpenoid	Seeds	MeOH/EtOAc	438	C₂₆H₃₀O₆	Pontianak, West Kalimantan, Indonesia	[71]

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7.1. Volatile Organic Compounds and Organic Acids

Volatile organic compounds (VOCs) are the small molecular weight lipophilic molecules with a low boiling point and volatility which result from the plant’s secondary and primary metabolism [54]. They include alcohols, terpenes, alkanes, olefins, aldehydes, and fatty acid derivatives [55].

The volatile constituents of langsat and duku fruits were obtained using vacuum distillation with subsequent extraction of the distillates by CH₂Cl₂ were analyzed by capillary GC and GC-MS. The results revealed that sesquiterpenes represented the dominant chemical class of volatiles in both langsat and duku fruits (77.14 and 89.21%, respectively) of which germacrene D (1) was the most abundant component [11]. Headspace-solid phase microextraction with the GCMS analysis of the juice from fruit obtained from Eastern Thailand revealed the presence of 43 volatiles among them 3-carene (2), δ-selinene (3), 1,3,5 trioxane (4), (E)-2-hexenal (5), α-cubebene (6), isoledene (7), and α-calacorene (8) were the major volatiles [56]. Longkong‘s fresh peel contains 0.2% of the brown resin, light-yellow volatile oil, and reducing acids. Whilst the dried peel contains semiliquid dark oleoresin composed of 22% resin and 0.17% volatile oil [16,44].

Furthermore, it was reported that the GCMS analysis of the longkong young fruit hot chloroform extract indicated the existence of 10.58% ethyl oleate (9), 11.53% hexadecanoic acid (10), 6.86% 1,2,4a,5,6,8a-hexahydro-4,7-dimethyl-1-(1-methylethyl)-naphthalene (11), 6.05% octadecanoic acid (12), and 5.97% α-cubebene (6) as dominant constituents [43]. Nevertheless, the GCMS analysis of the essential oil of longkong fruits collected from Narathiwat province showed the presence of α-copaene (13) (11.15%), oleic acid (14) (14.80%), δ-cadinene (15) (6.74%), germacrene-D (1) (9.16%), τ-muurolol (16) (6.34%), palmitic acid (17) (5.49%), and (+) spathulenol (18) (5.72%) [57] (Figure 1).

Structures of compounds 1–18 from *Lansium domesticum*.

The organic acids and their concentration in langsat and duku fruits were assessed using reversed-phase HPLC technique. The results revealed that the total organic acids in duku and langsat fruits were 0.604 and 1.04%, respectively, where citric (19) and malic acids (20) represented the major acids found in both fruits. Whilst piroglutamic (21) and ascorbic (22) acids existed in low concentrations [36]. Moreover, citric acid (19), glycolic acid (23), maleic acid (24), and malic acid (20) are the predominant acids found in the fruit (Figure 2) [57].

Structures of compounds 19–33 from *Lansium domesticum*.

7.2. Phenolics

It was stated that the longkong peel and flesh had a high phenolic content that is affected by the initiation of the phenylalanine ammonia-lyase activity upon external stimuli leading to abundant phenolics production [12]. Ferulic (25), p-coumaric (26), and gallic (27) acids, ellagic acid (28), and a high level of tannins were reported in longkong fruit [20,59,93]. Further, the phytochemical analysis of the ethyl acetate (LDSK50-EA) and aqueous (LDSK50-H₂O) fractions of longkong peels illustrated the presence of phenolics, mainly chlorogenic acid (29), rutin (30), and scopoletin (31) [51]. It is noteworthy to state that the pericarp possessed a higher flavonoid content than flesh, while the seeds have no flavonoids [53]. A high flavonoids yield was observed in the fruit extracted with hot H₂O in comparison to other kinds of solvents [43]. Alimon et al., reported the presence of flavonoids in langsat, duku, and longkong [93]. It is noteworthy that many flavonoids are found in the fruit, however, only rutin (30), quercetin (32), and catechin (33) have been detected (Figure 2) [43,51].

7.3. Terpenoids

The peel was reported to contain a large quantity of latex that had lansic acid (34) as a major component of the latex that was isolated firstly in 1967 by Kiang et al., from the light petroleum peel extract [94]. Lansioside A (35), a novel seco-onoceran aminoglucoside triterpenoid was isolated from the EtOH extract of L. domesticum peel by SiO₂ CC. It had an acetyl group linked to the nitrogen atom, characterizing the existence of N-acetyl-D-glucosamine. Its configuration was established by NMR and chemical derivation, as well as optical rotation [60,63]. In another study, Nishizawa et al., obtained seco-onoceran triterpenoids; lansic acid (34) and lansiosides B and C (36 and 37) from the peel CH₂Cl₂ fraction by SiO₂ CC. They gave the same aglycone methyl ester, methyl lansiolate (38) on methanolysis (Figure 3) [63]. Lansiosides B and C (36 and 37) are β-D-glucopyranoside and β-D-xyloside, respectively [19]. Compound 35 was found to inhibit leukotriene D₄-induced contraction of guinea pig ileum in vitro in a dose-dependent way (IC₅₀ 2.4 × l0⁶ g/mL, 2.4 ppm), while 36 and 37 were 10-fold less potent and 39 was inactive [19].

Structures of compounds 34–44 from *Lansium domesticum*.

Dukunolide A (40), a tetranortriterpenoid with a novel 26-carbon skeleton was purified from n-hexane extract of duku seeds by SiO₂ CC and recrystallization. Its structure was established by NMR spectroscopic data and single-crystal X-ray diffraction [69]. Nishizawa et al., isolated and characterized dukunolides A (40), B (41), and C (42), as well as revising the structure of 40 using NMR; the absolute configuration was deduced by chemical method and X-ray analysis. Compound 40 possessed a UV bathochromic shift due to the α,β,γ,δ-dienolide system and cis- ring junctions at C-l/C-2 and C-5/C-10, whereas 41 had a C-8/C-9 epoxide and saturated doubly conjugated δ-lactone moieties at the γ,δ-positions. Compound 42 was similar to 40, with an additional secondary acetoxyl group at C-22 [70]. Further, the same authors in 1988 isolated dukunolides D-F (43–45) from the CH₂Cl₂ extract of by SiO₂ CC using CH₂Cl₂/n-hexane or CH₂Cl₂/EtOAc as solvent system. Their structures were elucidated by NMR and the absolute configuration was deduced by X-ray analysis [72]. Dukunolides D (43) and E (44) were structurally similar to 40 and 41, respectively, with the absence of the 5,6-oxirane ring. Whilst dukunolide F (45) was assigned as stereoisomer of 44 [72] (Figure 3).

Seco-Dukunolide F (46), a 4-ring A/B/C/D fused tetranortriterpenoid was obtained from the seeds CH₂Cl₂ extract of Thai by SiO₂ CC using CH₂Cl₂/n-hexane or CH₂Cl₂/EtOAc as an eluting system. This compound possessed no antimalarial, antitubercular or anti-tumor activities [73]. Kokosanolide A (47), a tetranortriterpenoid was isolated from the n-hexane fraction of the Malaysian L. domestlcum seeds by SiO₂ CC and characterized by NMR and crystallographic analyses [74] (Figure 4). Supratman et al., obtained kokosanolide B (48) as crystals by SiO₂ CC from the bark EtOAc fraction. This compound structurally resembled 47, however, an H₂O was added to the endocyclic double bond to provide the corresponding alcohol [76]. Whilst kokosanolide D (50) was obtained from the peels n-BuOH fraction elucidated using IR, NMR, and HRMS [78].

Structures of compounds 45–54 from *Lansium domesticum*.

Tjokronegero et al., isolated 2 new tetranortriterpenoids; 8,14-secogammacera-7,14-diene-3,21-dione (51) and α,γ-onoceradienedione (52) from the n-hexane fraction of the bark using SiO₂ CC and PTLC (preparative thin-layer chromatography). These metabolites possessed two fused tetrahydrodecalin-type rings linked through an ethylene group. Their structure was assigned based on NMR and crystallographic techniques [79].

The EtOAc extract of L. domesticum leaves afforded a new cycloartan-type triterpenoid, 24(E)-cyclolanost-24-en-3-one, 21,23-epoxy-21,22-dihydroxy (21R, 22S, 23S) (53) that was purified by repeated SiO₂ CC and recrystallization in acetone. Its structure was elucidated by NMR and X-ray diffraction. It was characterized by a furan ring at C-20, C-21, C-22, and C-23, respectively [81].

Uyehara et al., established that cis-cisoid-cis isomer of 3-oxo-α-bourbonene (54) that was reported as toxic fish poison from L. domesticum had a unique cisoid-(5–4–5) fused ring skeleton and it was not identical to the toxic components of L. domesticum [82] (Figure 4).

7.4. Sterols

The fruit and its parts featured very few phytosterols. Pooasa isolated stigmasterol (55) and β-sitosterol (56) from the peel hexane and CH₂Cl₂ extracts. Moreover, the existence of triterpenes and unsaturated sterols was also reported [24,83] (Figure 5).

Structures of compounds 55–62 from *Lansium domesticum*.

8. Biological Activities of L. domesticum Extracts and Isolated Compounds

8.1. Anti-Malarial Activity

Malaria is a serious parasitic disease in tropical and subtropical regions all over the world, with 435,000 deaths and 219 million infections cited in 2017 [95]. The incidence of malaria has re-emerged in part due to several strains of P. falciparum becoming resistant to the available antimalarial agents. Thence, there is a crucial need for discovering new anti-malarial agents and for verifying the safety and efficiency of traditional medicinal plants that are utilized to fight this disease [96].

L. domesticum seeds and bark are traditionally known to be effective towards malaria parasite [30]. L. domesticum bark extracts were assessed for in vitro anti-plasmodial potential against chloroquine-resistant clone (W2) and -sensitive P. falciparum clone (D6). The bark extracts (Conc. 20 µg/mL) were notably active towards chloroquine-resistant clone W2 and exhibited selective potential towards chloroquine-sensitive P. falciparum clone D6 in the Kenyah malaria [30]. Further, the bark EtOAc fraction had a promising activity towards D6 and W2 P. falciparum clones (IC₅₀ 3.45 and 5.61 µg/mL, respectively). On the other hand, it had no significant effect on parasite clearance on the P. bergheii-infected mice [68]. On the other hand, the skin and leaf aqueous extracts equally reduced parasite number of both drug-sensitive (3D7) and chloroquine-resistant (T9) P. falciparum. The skin extracts interrupted the parasite lifecycle, which proved the effectiveness of L. domesticum as a source of antimalarial agents towards P. falciparum chloroquine-resistant strains [17]. Additionally, the seeds CH₂Cl₂ extract was found to significantly prohibit P. falciparum (IC₅₀ 9.9 µg/mL) [65,85]. It was stated that lansiolic acid (39) had antimalarial potential [97]. Yapp et al., obtained 4-hydroxy-N-methylproline (57), a cyclic hydroxy-amino acid with trans carboxyl and hydroxyl groups as a crystal from the peel MeOH extract. This compound exhibited antimalarial potential towards chloroquine-resistant P. falciparum (T9) strain only at concentration >1.0 mg/mL [84].

Saewan et al., reported the separation of new tetranortriterpenoids; domesticulides A–E (58–62), along with 11 known analogs; lansioside B (36), lansiolic acid (39), and dukunolide C (42), 6-hydroxymexicanolide (63), 6-acetoxymexicanolide (64), methyl angolensate (65), methyl 6-hydroxyangolensate (66), methyl 6-acetoxyangolensate (67), and azadiradione (68) from the seeds CH₂Cl₂ extract using SiO₂ CC and preparative TLC [65] (Figure 5 and Figure 6). Compounds 42, 59–61, 64, 65, 67, and 68 were moderately active (IC₅₀ 2.4–9.7 µg/mL) against P. falciparum (K1, multidrug-resistant strain), compared to artemisinin (IC₅₀ 0.001–0.003 µg/mL) in the microculture radioisotope assay. The results revealed that the C6-hydroxyl group lessened the activity as in 66 (IC₅₀ > 20.0 µg/mL), however, the substitution of C6-hydroxyl group with an acetoxy group increased the activity as in 59 (IC₅₀ 3.2 µg/mL), 63 (IC₅₀ 9.7 µg/mL), and 67 (IC₅₀ 3.8 µg/mL). The most active compounds were 59, 60, 67, and 68 (IC₅₀ values of 3.2, 2.4, 3.8, and 2.9 µg/mL, respectively) [65].

Structures of compounds 63–73 from *Lansium domesticum*.

Moreover, 6-Hydroxymexicanolide (63) had a swietenine skeleton (A/B/C/D 4-fused ring triterpenoid system) was purified from the seeds CH₂Cl₂ extract by SiO₂ CC using CH₂Cl₂/n-hexane or CH₂Cl₂/EtOAc and assigned based on NMR and X-ray techniques. It showed no noticeable effect (IC₅₀ >20 µg/mL) towards P. falciparum [85].

Omar obtained methyl lansiolate (38), lansiolic acid (39), α,γ-onoceradienedione (52), onoceratriene (69), lansionic acid (70), lansionic acid A (71), 21α-hydroxyonocera-8(26),14-dien-3-one (72), and methyl lansionate A (73) from the bark and assessed for their in vitro antimalarial potential towards the chloroquine-sensitive (D6) and chloroquine-resistant (W2) P. falciparum. Compounds 38, 52, 72, and 73 were the most potent compounds towards D6 P. falciparum (IC₅₀ ranging from 0.65–2.41µg/mL) in comparison to artemisinin (IC₅₀ 0.0015 µg/mL) and chloroquine (IC₅₀ 0.0045 µg/mL), while, only 38, 52, and 73 exhibited activity towards W2 P. falciparum (IC₅₀ values of 0.76, 1.83, and 1.02 µg/mL, respectively), compared to artemisinin (IC₅₀ 0.0035 µg/mL) and chloroquine (IC₅₀ 0.0065 µg/mL) [68] (Figure 6). Besides, 38 and 52 (Conc. 50 mg/kg/day) suppressed parasitemia levels by 44 and 20%, respectively, in the P. bergheii-infected mice, compared to quinine (dose of 10 mg/kg, 60%). Whilst 72 and 73 had no significant effect of parasite clearance on the infected mice [68] (Table 5).

Table 5.

Biological activity of reported phytoconstituents from Lansium domesticum.

Compound Name	Biological Activity	Assay, Organism, or Cell Line	Biological Results		Ref.
Compound Name	Biological Activity	Assay, Organism, or Cell Line	Compound	Positive Control	Ref.
Germacrene D (1)	Antimicrobial	Agar well/Escherichia coli	12.0 mm (CZ) *	Chloramphenicol 23.0 mm (CZ)	[58]
		Agar well/Pseudomonas aeruginosa	11.0 mm (CZ)	Chloramphenicol 8.0 (CZ)	[58]
		Agar well/Candida albicans	14.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Aspergillus niger	13.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Trichophyton mentagrophytes	13.0 mm (CZ)	Chloramphenicol 50.0 (mm (CZ)	[58]
Lansioside A (35)	Anti-leukotriene D₄	leukotriene D₄/guinea pig ileum	2.4 ppm (IC₅₀)	-	[19]
Lansioside B (36)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrugresistant strain)	>20.0 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Lansioside C (37)	Antimicrobial	Agar well/Staphylococcus aureus	19.0 mm (CZ)	Chloramphenicol 25.0 mm (CZ)	[58]
		Agar well/Escherichia coli	12.0 mm (CZ)	Chloramphenicol 23.0 mm (CZ)	[58]
		Agar well/Pseudomonas aeruginosa	12.0 mm (CZ)	Chloramphenicol 8.0 mm (CZ)	[58]
		Agar well/Bacillus subtitis	26.0 mm (CZ)	Chloramphenicol 20.0 mm (CZ)	[58]
		Agar well/Candida albicans	13.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Aspergillus niger	14.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Trichophyton mentagrophytes	20.0 mm (CZ)	Chloramphenicol 50.0 mm (CZ)	[58]
Methyl lansiolate (38)	Antimalarial	Microculture radioisotope/P. falciparum (D6, chloroquine sensitive strain)	0.65 µg/mL (IC₅₀)	Artemisinin 0.0015 µg/mL (IC₅₀) Chloroquine 0.0045 µg/mL (IC₅₀)	[68]
		Microculture radioisotope/P. falciparum (W2, chloroquine resistant strain)	0.76 µg/mL (IC₅₀)	Artemisinin 0.0035 µg/mL (IC₅₀) Chloroquine 0.0065 µg/mL (IC₅₀)	[68]
	Cytotoxicity	SRB/KB	128.0 cells % survival	-	[68]
Lansiolic acid (39)	Antimicrobial	Agar well/Staphylococcus aureus	12.0 mm (CZ)	Chloramphenicol 25.0 mm (CZ)	[58]
		Agar well/Escherichia coli	11.0 mm (CZ)	Chloramphenicol 23.0 mm (CZ)	[58]
		Agar well/Pseudomonas aeruginosa	12.0 mm (CZ)	Chloramphenicol 8.0 mm (CZ)	[58]
		Agar well/Bacillus subtitis	13.0 mm (CZ)	Chloramphenicol 20.0 mm (CZ)	[58]
		Agar well/Candida albicans	14.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Aspergillus niger	14.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Trichophyton mentagrophytes	14.0 mm (CZ)	Chloramphenicol 50.0 mm (CZ)	[58]
	Antimalarial	Microculture radioisotope/P. falciparum (D6, chloroquine-sensitive strain)	>10 µg/mL (IC₅₀)	Artemisinin 0.0015 µg/mL (IC₅₀) Chloroquine 0.0045 µg/mL (IC₅₀)	[68]
		Microculture radioisotope/P. falciparum (W2, chloroquine- resistant strain)	>10 µg/mL (IC₅₀)	Artemisinin 0.0035 µg/mL (IC₅₀) Chloroquine 0.0065 µg/mL (IC₅₀)	[68]
		Microculture radioisotope/P. falciparum (K1, multidrug-resistant strain)	>20.0 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
	Cytotoxicity	SRB/KB	116.1 cells % survival	-	[68]
Dukunolide C (42)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug-resistant strain)	5.2 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Kokosanolide A (47)	Cytotoxicity	MTT/MCF-7	8.62 μg/mL (IC₅₀)	-	[98]
Kokosanolide B (48)	Antibacterial	Disc diffusion/E. coli	8.0 mm (IZD)	Vancomycin 17.5 mm (IZD) Chloramphenicol 18.5 mm (IZD) Sulphonamide 9 mm (IZD)	[77]
8,14-Secogammacera-7,14-diene-3,21-dione (51)	Antibacterial	Disc diffusion/E. coli	7.5 mm (IZD)	Vancomycin 17.5 mm (IZD) Chloramphenicol 18.5 mm (IZD) Sulphonamide 9 mm (IZD)	[77]
α,γ-Onoceradienedione = 8,14-Secogammacera-7,14(27)-diene-3,21-dione (52)	Antimicrobial	Agar well/Pseudomonas aeruginosa	13.0 mm (CZ)	Chloramphenicol 8.0 mm (CZ)	[58]
		Agar well/Candida albicans	13.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Aspergillus niger	12.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Trichophyton mentagrophytes	13.0 mm (CZ)	Chloramphenicol 50.0 mm (CZ)	[58]
	Antimalarial	Microculture radioisotope/P. falciparum (D6, chloroquine sensitive strain)	1.66 µg/mL (IC₅₀)	Artemisinin 0.0015 µg/mL (IC₅₀) Chloroquine 0.0045 µg/mL (IC₅₀)	[68]
		Microculture radioisotope/P. falciparum (W2, chloroquine resistant strain)	1.83 µg/mL (IC₅₀)	Artemisinin 0.0035 µg/mL (IC₅₀) Chloroquine 0.0065 µg/mL (IC₅₀)	[68]
	Cytotoxicity	SRB/KB	131.5 cells % survival	-	[68]
		MTT/HeLa	32.39 μg/mL (IC₅₀)	Doxorubicin 2.83 μg/mL (IC₅₀)	[80]
		MTT/T-47D	30.69 μg/mL (IC₅₀)	Doxorubicin 0.04 μg/mL (IC₅₀)	[80]
		MTT/A549	13.71 μg/mL (IC₅₀)	-	[80]
Domesticulide A (58)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	>20.0 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Domesticulide B (59)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	3.2 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Domesticulide C (60)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	2.4 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Domesticulide D (61)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	6.9 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Domesticulide E (62)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	>20.0 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
6-Hydroxymexicanolide (63)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	>20.0 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
6-Acetoxymexicanolide (64)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	9.7 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Methyl angolensate (65)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	5.9 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Methyl 6-hydroxyangolensate (66)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	>20.0 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Methyl 6-acetoxyangolensate (67)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	3.8 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Azadiradione (68)	Antimalarial	Microculture radioisotope/P. falciparum (K1, multidrug resistant strain)	2.9 µg/mL (IC₅₀)	Artemisinin 0.001–0.003 µg/mL (IC₅₀)	[65]
Onoceratriene (69)	Antimalarial	Microculture radioisotope/P. falciparum (D6, chloroquine sensitive strain)	>10 µg/mL (IC₅₀)	Artemisinin 0.0015 µg/mL (IC₅₀) Chloroquine 0.0045 µg/mL (IC₅₀)	[68]
		Microculture radioisotope/P. falciparum (W2, chloroquine resistant strain)	>10 µg/mL (IC₅₀)	Artemisinin 0.0035 µg/mL (IC₅₀) Chloroquine 0.0065 µg/mL (IC₅₀)	[68]
	Cytotoxicity	SRB/KB	108.3 cells % survival	-	[68]
Lansionic acid = 3-ketolansiolic acid (70)	Antimicrobial	Agar well/Escherichia coli	12.0 mm (CZ)	Chloramphenicol 23.0 mm (CZ)	[58]
		Agar well/Pseudomonas aeruginosa	12.0 mm (CZ)	Chloramphenicol 8.0 mm (CZ)	[58]
		Agar well/Bacillus subtitis	13.0 mm (CZ)	Chloramphenicol 20.0 mm (CZ)	[58]
		Agar well/Candida albicans	12.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Aspergillus niger	14.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Trichophyton mentagrophytes	15.0 mm (CZ)	Chloramphenicol 50.0 mm (CZ)	[58]
	Antimalarial	Microculture radioisotope/P. falciparum (D6, chloroquine-sensitive strain)	>10 µg/mL (IC₅₀)	Artemisinin 0.0015 µg/mL (IC₅₀) Chloroquine 0.0045 µg/mL (IC₅₀)	[68]
		Microculture radioisotope/P. falciparum (W2, chloroquine-resistant strain)	>10 µg/mL (IC₅₀)	Artemisinin 0.0035 µg/mL (IC₅₀) Chloroquine 0.0065 µg/mL (IC₅₀)	[68]
	Cytotoxicity	SRB/KB	129.1 cells % survival	-	[68]
Lansionic acid A = Lansiolic acid A (71)	Antimalarial	Microculture radioisotope/P. falciparum (D6, chloroquine-sensitive strain)	>10 µg/mL (IC₅₀)	Artemisinin 0.0015 µg/mL (IC₅₀) Chloroquine 0.0045 µg/mL (IC₅₀)	[68]
		Microculture radioisotope/P. falciparum (W2, chloroquine resistant strain)	>10 µg/mL (IC₅₀)	Artemisinin 0.0035 µg/mL (IC₅₀) Chloroquine 0.0065 µg/mL (IC₅₀)	[68]
	Cytotoxicity	SRB/KB	134.5 cells % survival	-	[68]
21α-Hydroxyonocera-8(26),14-dien-3-one = 3-keto-22-hydroxyonoceradiene (72)	Antimalarial	Microculture radioisotope/P. falciparum (D6, chloroquine-sensitive strain)	2.41 µg/mL (IC₅₀)	Artemisinin 0.0015 µg/mL (IC₅₀) Chloroquine 0.0045 µg/mL (IC₅₀)	[68]
		Microculture radioisotope/P. falciparum (W2, chloroquine-resistant strain)	>10 µg/mL (IC₅₀)	Artemisinin 0.0035 µg/mL (IC₅₀) Chloroquine 0.0065 µg/mL (IC₅₀)	[68]
	Cytotoxicity	SRB/KB	113.9 cells % survival	-	[68]
Methyl lansiolate A (73)	Antimalarial	Microculture radioisotope/P. falciparum (D6, chloroquine-sensitive strain)	0.69 µg/mL (IC₅₀)	Artemisinin 0.0015 µg/mL (IC₅₀) Chloroquine 0.0045 µg/mL (IC₅₀)	[68]
		Microculture radioisotope/P. falciparum (W2, chloroquine-resistant strain)	1.02 µg/mL (IC₅₀)	Artemisinin 0.0035 µg/mL (IC₅₀) Chloroquine 0.0065 µg/mL (IC₅₀)	[68]
	Cytotoxicity	SRB/KB	66.7 cells % survival	-	[68]
Lamesticumin A (85)	Antibacterial	Microdilution/S. aureus	6.25 µg/mL (MIC)	Magnolol 25.0 µg/mL (MIC)	[87]
		Microdilution/S. epidermidis	12.5 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
		Microdilution/M. luteus	6.25 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
		Microdilution/B. subtilis	3.12 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
		Microdilution/M. pyogenes	3.12 µg/mL (MIC)	Magnolol 25.0 µg/mL (MIC)	[87]
		Microdilution/B. cereus	3.12 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
	Cytotoxicity	MTT/T-47D	15.68 µg/mL (IC₅₀)	Doxorubicin 0.18 µg/mL (IC₅₀)	[35]
3β-Hydroxyonocera-8(26),14-dien-21-one (90)	Antimicrobial	Agar well/Escherichia coli	11.0 mm (CZ)	Chloramphenicol 23.0 mm (CZ)	[58]
		Agar well/Pseudomonas aeruginosa	12.0 mm (CZ)	Chloramphenicol 8.0 mm (CZ)	[58]
		Agar well/Candida albicans	14.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Aspergillus niger	15.0 mm (CZ)	Chloramphenicol 10.0 mm (CZ)	[58]
		Agar well/Trichophyton mentagrophytes	13.0 mm (CZ)	Chloramphenicol 50.0 mm (CZ)	[58]
Obebioside A (93)	Notch inhibitor	Luciferase/LS174T cells	1.65 μM (IC₅₀)	DAPT 20 nM (IC₅₀)	[90]
Honghelin (95)	Notch inhibitor	Luciferase/LS174T cells	0.62 μM (IC₅₀)	DAPT 20 nM (IC₅₀)	[90]
Obeside B (96)	Notch inhibitor	Luciferase/LS174T cells	0.51 μM (IC₅₀)	DAPT 20 nM (IC₅₀)	[90]
2-Ethyl,l,3-(2‘-menthene)propenal (99)	Cytotoxicity	MTT/T-47D	48.58 µg/mL (IC₅₀)	Doxorubicin 0.43 µg/mL (IC₅₀)	[35]
2-Ethyl,l,3-(2‘-menthene)propenal (99)		MTT/HepG2	127.45 µg/mL (IC₅₀)	Doxorubicin 1.18 µg/mL (IC₅₀)	[35]
Lamesticumin G (100)	α-Glucosidase inhibitory	Colorimetric/Maltase	2.27 mM (IC₅₀)	Acarbose 0.0021 mM (IC₅₀)	[66]
17(20)E-dyscusin B (101)	NO inhibition	MTS/RAW264.7	9.13 μM (IC₅₀)	L-NMMA 0.18 µM (IC₅₀)	[86]
17(20)Z-dyscusin B (102)	NO inhibition	MTS/RAW264.7	14.03 μM (IC₅₀)	L-NMMA 0.18 µM (IC₅₀)	[86]
Lamesticumin B (106)	Antibacterial	Microdilution/S. aureus	6.25 µg/mL (MIC)	Magnolol 25.0 µg/mL (MIC)	[87]
		Microdilution/S. epidermidis	12.5 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
		Microdilution/M. luteus	3.12 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
		Microdilution/B. subtilis	3.12 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
		Microdilution/M. pyogenes	3.12 µg/mL (MIC)	Magnolol 25.0 µg/mL (MIC)	[87]
		Microdilution/B. cereus	3.12 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
Lamesticumin C (107)	Antibacterial	Microdilution/S. aureus	6.25 µg/mL (MIC)	Magnolol 25.0 µg/mL (MIC)	[87]
		Microdilution/S. epidermidis	12.5 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
		Microdilution/M. luteus	6.25 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
		Microdilution/B. subtilis	3.12 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
		Microdilution/M. pyogenes	3.12 µg/mL (MIC)	Magnolol 25.0 µg/mL (MIC)	[87]
		Microdilution/B. cereus	3.12 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
Lamesticumin D (108)	Antibacterial	Microdilution/B. subtilis	6.25 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
Lamesticumin D (108)		Microdilution/B. cereus	3.12 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
Lamesticumin E (109)	Antibacterial	Microdilution/B. subtilis	12.5 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
		Microdilution/M. pyogenes	6.25 µg/mL (MIC)	Magnolol 25.0 µg/mL (MIC)	[87]
		Microdilution/B. cereus	3.12 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
Lamesticumin F (110)	Antibacterial	Microdilution/B. subtilis	12.5 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]
Lamesticumin F (110)		Microdilution/B. cereus	3.12 µg/mL (MIC)	Magnolol 12.5 µg/mL (MIC)	[87]

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* CZ: clear zone.

8.2. Antifeedant, Insecticidal, and Larvicidal Activities

Natural pest controlling agents have been publicized as substitutes to synthetic chemicals for integrated pest management. These phytochemicals are known to pose little threat to human health or to the environment [99]. Recently, there has been a fast-growing interest in the use of more ecologically acceptable methods to protect the food supply from predatory insect attacks [100]. Antifeedants are compounds that either prevent insect feeding (feeding deterrent effect) or cause slowing or cessation of further feeding (feeding suppressant effect) [99,101]. They attract special attention owing to their potential utilization in integrated pest control systems [102].

The feeding deterrence study towards Sitophilus oryzae revealed that flour disks prepared using the barks ethyl acetate and n-hexane fractions totally inhibited the diet consumption at 0.50% (w/w), but the H₂O extract was phagostimulatory [34]. Mayanti et al., isolated two tetranortriterpenoids; kokosanolide A (47) and C (49) and 3 onoceranoid-triterpenoids; kokosanolide B (48), 8,14-secogammacera-7,14-diene-3,21-dione (51), and 8,14-secogammacera-7,14(27)-diene-3,21-dione (52) from the seeds n-hexane fraction and barks EtOAc fraction, respectively [75]. They possessed moderate to potent antifeedant activity with 78, 0, 99, 85, and 56%, respectively, towards the fourth instar larvae of Epilachna vigintioctopunctata (Conc. 1%) [75] (Figure 7). Compounds 39, 52, 69, 71, and 72 isolated from the bark EtOAc fraction exhibited significant insect antifeedant potential towards Sitophilus oryzae (rice weevil) using a flour disk bioassay (Conc. 0.5% w/w), however, 70 was inactive at this concentration. Compounds 52, 71, and 72 had the highest activity with % consumption of diet 40.1, 56.1, and 53.8%, respectively [34,68]. Arnason et al., also reported the insect feeding deterrent potential of 39 [97].

Structures of compounds 74–81 from *Lansium domesticum*.

Leatemia et al., stated that the EtOH seed extracts of L. domesticum obtained from different locations and years in Maluku, Indonesia had an insecticidal potential towards Spodoptera litura, with a % growth inhibition of 78–118% with no significant effect of collection locations on the activity [103]. Additionally, the aqueous extract of fresh leaves was evaluated for larvicidal potential towards Aedes aegvpti and Culex quinquefasciatus by exposing 3rd–4th instar larvae to different concentrations of the extract. The extract was highly effective towards larvae of Ae. aegvpti (LD₅₀ and LD₉₀ 4.0847 and 37.7165 g%) and Cx. quinquejbsciatus (LD₅₀ and LD₉₀ 4.0289 and 16.3316 g%) [32].

8.3. Anti-Fertility Activity

The increase in the human population is one of the most critical problems throughout the world, especially in underdeveloped and developing countries [104]. The evaluation of the antifertility potential of the medicinal plant has been growing worldwide as a means of identifying safe and effective agents for controlling the population explosion [105]. L. domesticum bark water decoction was used by rural communities in East Kalimantan as an anti-fertility agent. The potential of water decoction of bark stew on uterus weight and estrous cycle in mice had been assessed [31]. The estrous cycle is the reproductive cycle in female mice that ranges from 4–5 days. The results revealed that H₂O decoction of the bark had no remarkable effect on the uterine weight and estrous cycle in female mice. Therefore, the anti-fertility potential of the bark H₂O decoction was not proven [31].

8.4. Antimutagenic Activity

Mutagens are agents that can invoke mutations [106]. They are not only included in carcinogenesis and genotoxicity but also the pathogenesis and inception of many chronic diseases, including neurodegenerative, cardiovascular, and hepatic disorders, chronic inflammation, arthritis, diabetes, and aging [107,108]. Natural antimutagenics are known to protect against the detrimental effects of mutagens. They include various plants and their active metabolites such as flavonoids, phenolics, coumarins, carotenoids, tannins, anthraquinones, saponins, and terpenoids [107].

The MeOH extract of leaves exhibited antimutagenic potential towards 2-amino-1-methyl-6-phenylimidazo (4,5-b)pyridine (PhIP) and 3-amino-1,4-dimethyl-5H-pyrido [4,3-b]indole (Trp-P-1)-produced mutagenicity with inhibition 80.8 and 75.7%, respectively, at 125 μg/plate in the Ames test [62]. Additionally, the peel 50% EtOAc fraction showed significant anti-mutagenic potential towards mitomycin C-induced mutagenicity in TK6 human lymphoblasts in the cytokinesis-blocked micronucleus assay [109].

The new onoceranoid triterpenoids, lansium acids I–IX (75–83), along with 34, 36–39, 51, 70, 84, and 85, were purified from the leaves EtOAc fraction using normal- and RP₁₈ SiO₂ CC and repeated HPLC (Figure 8). They were characterized by chemical derivatization and spectroscopic analyses and absolute stereo-structures were assigned via X-ray diffraction and electronic circular dichroism spectra. Compounds 34, 38, 39, and 84 displayed antimutagenic potential towards Trp-P-1 and PhIP in the Ames assay. Further, the oral intake of 70 (Conc. 0.03% or 0.06%, w/w) exhibited in vivo antimutagenic potential towards PhIP in the micronucleus test. This was evident by the presence of fewer MNRETs (micro-nucleated reticulocytes) caused by PhIP [62].

Structures of compounds 82–89 from *Lansium domesticum*.

In 2019, Matsumoto et al., isolated 3 new onoceranoid triterpenoids; lansium acids X–XII (86–88) and a new cycloartanoid; lansium acid XIII (89) (Figure 8). Compounds 86–88 had antimutagenic effectiveness towards Trp-P-1 without antimicrobial activity using Salmonella typhimurium TA98 strain in the Ames assay. Their effects were attributed to the inhibition of CYP1A2 (cytochrome P450 1A2), which bioactivated Trp-P-1 mutagenicity [88].

8.5. Cytotoxic Activity

Cancer represents one of the major reasons for death globally [110]. Many of the available chemotherapies possess serious side effects, drug resistance, and none target specificity [111]. Thus, there is an emerging search to develop drugs from natural sources in order to overcome these drawbacks. Natural metabolites from diverse sources, including microorganisms, plants, and animals, present a great pool for the discovery of novel therapeutic candidates for treating this disease [112].

Recently, it was reported that the n-hexane fraction of the fruit peels demonstrated noticeable activity towards T47D cell lines (IC₅₀ 0.1 µg/mL) compared to doxorubicin (IC₅₀ 0.04 µg/mL), as well as weak cytotoxic potential towards HeLa and A549 (IC₅₀ 59.55 and 18.83 µg/mL, respectively) in the MTT assay [80]. Besides, the peels total EtOAc extract, n-hexane soluble fraction, and n-hexane insoluble fraction had cytotoxic activity in the MTT assay towards T-47D cancer cell line (IC₅₀ 29.41, 43.51, and 25.57 μg/mL, respectively) compared to doxorubicin (IC₅₀ 0.18 μg/mL) [91]. The 24, 48, and 72 h-treatment of HT-29 cell with peels MeOH, EtOH, and EtOAc extracts (Conc. 0–100 µg/mL) in the MTT assay revealed that MeOH extract exhibited cytotoxic potential (IC₅₀ 6.79 µg/mL) and induced morphological changes towards HT-29 cells line after 27 h, while EtOAc (IC₅₀ 86.00 µg/mL) and EtOH extracts displayed a weak or no activity [113].

Moreover, the peel MeOH extract had toxicity against Artemia salina [61]. Further, the leaves MeOH extract (Conc. 200 μg/mL) exhibited Notch inhibitory potential by reducing luciferase activity to 30% and cell viability to 62% compared to those of the control [90].

Manosroi et al., assessed the cytotoxic capacities of cold and hot H₂O, cold and hot MeOH, and cold and hot CHCl₃ extracts of eight L. domesticum parts (young fruits (YF), ripe fruits (RF), old leaves (OL), seeds (SE), young leaves (YL), peels (PE), stalk (ST), and branches (BR)] that were collected from three provinces (Satun, Narathiwat, and Yala) in the south of Thailand towards B₁₆F₁₀, KB, HepG2, and HT-29 using SRB assay. It is noteworthy that ripe fruits cold water extract (RFWC) had the highest percentage yield (59.38%). The hot and cold MeOH extract of stalks (STMH and STMC) showed the highest total flavonoid and phenolic contents. The young fruit cold (YFCC) and hot CHCl₃ (YFCH) extracts possessed cytotoxic potential (IC₅₀ < 1 mg/mL) towards all cancer cells. In apoptotic induction, YFCH displayed the highest apoptotic effectiveness towards KB with 13.84% at 0.5 mg/mL and towards HT-29 with 8.68% at 5 mg/mL. On the other hand, YFCC had the highest apoptotic potential towards KB cells (10.70% at 0.5 mg/mL) [43]. The YFCH exhibited the highest necrotic induction potential towards KB and B₁₆F₁₀ cell lines (% necrosis 6.19 and 27.58% at 5 mg/mL, respectively) whereas YFCC had the highest potential towards KB, HT-29, HepG2, and B₁₆F₁₀ cell lines at 5 mg/mL (% necrosis 45.36, 41.13, and 100%, respectively) [43].

Besides, Manosroi et al., stated that the young fruit hot (NYFCH) and cold chloroform (NYFCC) extracts from the Northern region exhibited antiproliferative effect towards KB cells (IC₅₀ 603.45 and 765.06 µg/mL, respectively) in the SRB assay, compared to cisplatin (IC₅₀ 12.72 µg/mL), fluorouracil (IC₅₀ 12.94 µg/mL), doxorubicin (IC₅₀ 0.82 µg/mL), and vincristine (IC₅₀ 0.03 µg/mL). The triterpenoids in the chloroform extracts may be accountable for this effect [53]. Additionally, they had higher active MMP-2 inhibitory potential (53.03 and 31.30% for NYFCC and 49.40 and 21.72% for NYFCH) than all anticancer agents except cisplatin. The antioxidative triterpenes in hot chloroform extract inhibited matrix metalloproteases (MMPs), which regulate invasion and cellular motility of cancer cells, indicating that the NYFCH could be further developed to an oral anticancer agent [53].

In addition, kokosanolide A (47) had potent cytotoxic potential (IC₅₀ 8.62 μg/mL) towards MCF-7 cancer cells. Furthermore, the molecular docking study revealed that 47 and 49 showed strong bond-free energy (−8.8 kcal/mol and -8.7 kcal/mol, respectively) to estrogen receptor-α (ERα), therefore they inhibited ERα in breast cancer cells [98]. Tanaka et al., obtained 3 new onoceranoid triterpenes; 70, 72, and 90 from the peel EtOAc fraction that exhibited moderate toxicity against A. salina (Conc. 100 µg/mL) [61] (Figure 9).

Structures of compounds 90–95 from *Lansium domesticum*.

Putri et al., separated 3-hydroxy-8,14-secogammacera-7,14-dien-21-one (91), a new onoceranoid triterpenoid from peel n-hexane extract that exhibited weak activity against MCF-7 (IC₅₀ 717.5 µM) compared to doxorubicin (IC₅₀ 35.7 µM) in the MTT [89].

Additionally, 52 demonstrated weak cytotoxic potential towards A549 (IC₅₀ 13.71 μg/mL) and moderate activity towards HeLa and T47D cell lines (IC₅₀s 32.32 and 30.69 μg/mL, respectively) compared to doxorubicin (IC₅₀ 2.83 and 0.04 μg/mL, respectively) in the MTT assay [80]. Additionally, lamesticumin A (85), an onoceranoid-type triterpenoid was isolated from the peels n-hexane fraction that possessed cytotoxic potential towards T-47D (IC₅₀ 15.68 µg/mL) compared to doxorubicin (IC₅₀ 0.18 µg/mL) in the MTT assay [91].

Nishizawa et al., obtained 3-oxo-24-cycloarten-21-oic acid (92), a new cycloartanoid triterpene carboxylic acid, along with 34, 39, and 40 from L. domesticum leaves. Compound 92 exhibited significant inhibitory activity of skin-tumor promotion at a concentration of 3.2 nM in EBV-EA (Epstein Barr virus activation-early antigen) in Raji cells induced by TPA (12-O-tetradecanoyl-phorbol-13-acetate) [67] (Figure 9).

Tsuchiya et al., purified 6 cardenolides, obebioside A (93), obebioside B (94), honghelin (95), obeside B (96), obeside C (97), and digitoxigenin (98) from the EtOAc-soluble fraction of L. domesticum leaves by SiO₂, ODS (octadecyl silica), and ODS-HPLC CC (Figure 10). They were identified by NMR, ESIMS, and optical rotation. These compounds were assessed for their Notch signaling inhibitory potential compared to the DAPT (γ-secretase inhibitor, N-(N-(3,5-difluorophenacetyl)-l-alanyl)-S-phenylglycine t-butyl ester). Compounds 93, 94, and 95 demonstrated potent Notch inhibition (IC₅₀ 1.65, 0.62, and 0.51 μM, respectively), whereas 96, 97, and 98 were inactive. Further, 95 was also potent cytotoxic (IC₅₀ of 34 nM) towards HPB-ALL in the Alamar Blue assay. It induced the C17.2 neural stem cells differentiation to neurons, resulting in a 65% rise in differentiation. It inhibited Notch signaling through a dual mechanism, including lowering of both MAML (mastermind-like) protein and Notch1 levels [90]. Notch signaling possesses substantial roles in cell differentiation and proliferation, abnormal activation of this signaling promotes cancer progression [114,115]. Therefore, 95 as a Notch signaling inhibitor may be a candidate for an anticancer agent or could have application in neural regenerative medicine [90]. 2-Ethyl,l,3-(2′-menthene)propenal (99), an aldehyde sesquiterpene was obtained from the peels EtOAc extract that gave a red-brown color after Ce(SO4)₂ visualization (Figure 10). It displayed cytotoxic potential towards T-47D (IC₅₀ 48.58 µg/mL) and HepG2 (IC₅₀ 127.45 µg/mL) compared to doxorubicin (IC₅₀ 0.43 and 1.18 µg/mL, respectively) in the MTT assay [35].

Structures of compounds 96–**105** from *Lansium domesticum*.

8.6. Antioxidant Activity

Chronic illnesses such as diabetes, cancer, and cardiovascular and neurodegenerative diseases are featured by an incremented state of oxidative stress that may result from a decline in antioxidant defenses and/or reactive species (ROS) overproduction [116]. Natural compounds are known to have better antioxidant potential than synthetic antioxidants, making them an extremely attractive ingredient for commercial foods [117]. Despite the huge number of natural antioxidative agents, searching for new chemical entities with antioxidant potential remains a growing field.

Klungsupya et al., reported that the peel 50% EtOAc fraction possessed potent antioxidant capacity [109]. Also, the EtOH-EtOAc (50:50%, v/v) and EtOH:H₂O (50:50%, v/v) fractions showed potent O₂^-bullet and OH^bullet scavenging activity in the photo-chemiluminescence assay. They had protective potential on H₂O₂-induced DNA damage on TK6 human lymphoblast cells (Conc. 25, 50, 100, and 200 μg/mL) in the comet assay [51].

Subandrate et al., reported that the seed extract (dose 100 mg/kg BW) had an antioxidant potential, where it increased GSH (glutathione) and lowered MDA (malondialdehyde) in alcohol-induced rats, therefore it prohibited free radicals and inhibited lipid peroxidation [118]. Moreover, the EtOAc fraction of the seeds exhibited a strong antiradical potential (IC₅₀ 8.938 µg/mL) than water fraction, n-hexane fraction, and methanol extract (IC₅₀ 13.898, 11.012, and 14.624 µg/mL, respectively) in comparison to vitamin C (IC₅₀ 4.721 µg/mL). This effect was referred to its high phenolic and flavonoid contents (58.25 mg GAE/g and 75.123 mg QE/g, respectively) [119].

Manosroi et al., collected various parts of L. domesticum from Eastern and Northern Thailand and extracted them by the cold and hot methods using H₂O, CHCl₃, and MeOH. The hot seeds H₂O extract from the Northern region (NSEWH) possessed the highest free radical scavenging (FRS) potential (SC₅₀ 0.34 µg/mL) in the DPPH assay, compared to ascorbic acid (SC₅₀ 0.08 µg/mL). On the other hand, the hot CHCl₃ extract of the young leaves from the Eastern region (EYLCH) had the potent lipid peroxidation inhibition (IPC₅₀ 0.86 µg/mL), compared to α-tocopherol (IPC₅₀ 0.03 µg/mL) in the modified ferric-thiocyanate method. Additionally, the cold-H₂O extract of the old leaves from the Northern region (NOLWC) exhibited the powerful metal ion chelating potential (MC₅₀ 0.47 µg/mL), compared to EDTA (MC₅₀ 0.06 µg/mL) in the ferrous ion chelating method. It is noteworthy that the extracts from the Northern region had higher FRS, metal ion chelating, and lipid peroxidation inhibition activity than those from the Eastern region. This might be attributed to the flavonoid and phenolic compounds in the extracts [53].

Apridamayanti et al., reported that the stem bark displayed weak antioxidant potential (IC₅₀ 2820 ppm) in the DPPH assay [120].

The 96% EtOH and EtOAc extracts from fruit peels (FP) and flesh (FF) of L. domesticum were prepared by maceration with ethyl acetate and 96% ethanol. FP-EtOAc and FF-EtOAc extracts had potent antioxidant potential in the DPPH, BCB (β-carotene bleaching), and FRAP (ferric reducing antioxidant power) assays, respectively [121].

8.7. α-Glucosidase Inhibitory Activity

Diabetes continues to be a main health concern worldwide. It is featured by a defect in insulin action and/or secretion associated by hyperglycemia and disruption in lipid, carbohydrate, and protein metabolism [122,123]. The best therapeutic strategy for type-II diabetes is to lower hyperglycemia through retardation of the intake of glucose by repression of α-glucosidases and α-amylases, which are accountable for the di- and oligosaccharides breakdown into glucose [123].

A novel onoceranoid triterpenoid, named lamesticumin G (100), along with methyl lansiolate (38), lansiolic acid (39), lansionic acid (70), and 3β-hydroxyonocera-8(26), 14-dien-21-one (90), were separated from the fruit peels EtOAc fraction. They were assessed for α-glucosidase inhibition towards rat intestinal α-glucosidases (sucrase and maltase). Lamesticumin G (100) inhibited α-glucosidase (IC₅₀ 2.27 mM), compared to acarbose (IC₅₀ 0.0021 mM), while 38, 39, 70, and 90 had no inhibitory potential towards maltase enzyme in the colorimetric assay [66].

8.8. Anti-Aging Activity

Aging is a process distinguished by the accumulation of the degenerative damages, ultimately leading to the death of an organism [124]. It is the highest risk factor for various age-linked disorders, such as diabetes, neurodegenerative disease, cancer, and stroke [125]. A wealth of research aims to develop therapies that delay age-related disorders in human. The 96% EtOH and EtOAc extracts from fruit peels (FP) and flesh (FF) of L. domesticum were assessed for the elastase and collagenase inhibitory activity. FP-EtOH and FP-EtOAc extracts exhibited the most potent elastase and collagenase inhibitory activity. Nevertheless, FF-EtOH extract possessed the highest tyrosinase inhibitory capacity. Therefore, the fruit flesh and peel extracts of L. domesticum could be a cosmetic active ingredient because of their anti-tyrosinase and anti-aging capacities [121].

8.9. Analgesic and Anti-Inflammatory Activities

Inflammation occurs in response to processes such as cell death, tissue injury, ischemia, cancer, and degeneration, leading to the synthesis and secretion of numerous inflammatory mediators [126]. Pain is a public health problem with considerable socioeconomic effects [127]. Its treatment needs analgesics including, anti-inflammatory agents that exhibit analgesic potential at maximum doses [128]. In this respect, the inhibition of NO (nitric oxide) and PGE2 (prostaglandin E2) production has been established as a potential therapy for different inflammatory disorders [126,129]. Several available analgesics and anti-inflammatory drugs possess adverse effects [130]. Accordingly, medicinal plants can represent a significant source of natural and safer new drugs for treating pain and inflammation [129].

Purification of the leaves EtOAc-soluble fraction yielded two new metabolites: 17(20)E-dyscusin B (101) and 17(20)Z-dyscusin B (102), along with 64, 103, and 104. Compounds 101 and 102 were a pair of Δ¹⁷⁽²⁰⁾ geometric isomers of pregnane steroids as established by NMR, MS, and IR analyses (Figure 10). Compounds 101 and 102 showed the significant NO inhibition in LPS-stimulated RAW264.7 cells (IC₅₀s 9.13 and 14.03 µM, respectively) compared with L-NMMA (IC₅₀ 0.18 µM), whereas 64, 103, and 104 were inactive (IC₅₀ > 25 µM) in the colorimetric MTS assay [86]. Apridamayanti et al., reported that stem bark infusion had analgesic capacity with dose of 65, 130, and 195 mg/kg BW towards 0.6% acetic acid-induced writhing in mice, with writhing protection at the percentage of 57.52, 42.48, and 24.51%, respectively [120].

8.10. Antibacterial Activity

Antibiotics represent one of the most substantial interventions in human medicine [131]. However, the world has witnessed an alarming rise in the failure of many antibiotics to treat bacterial infections due to the generation of antibiotic-resistant and antibiotic-tolerant persister cells and biofilms [132,133]. Natural products from various sources may contribute to the discovery of novel therapeutics for multi-drug resistant bacterial infections.

Marfori et al., isolated lansioside D (105) from acetone fraction of EtOAc extract of the fruit peel that exhibited pronounced antibacterial activity against S. aureus and B. subtilis with MICs 31.25 and 15.62 μg/mL, respectively. It was moderately active versus E. coli (MIC 250 μg/mL) and inactive against Candida lipolytica, Saccharomyces cerevisiae, Cladosporium herbarum, and Aspergillus niger [92].

Ragasa et al., isolated five new onoceranoid triterpenes: lansioside C (37), lansiolic acid (39), α,γ-onoceradienedione (52), lansionic acid (70), and 3β-hydroxyonocera-8(26),14-dien-21-one (90) from the peels CH₂Cl₂ extract and germacrene D (1) and lansiolic acid (39) from the seeds. All compounds exhibited antibacterial potential versus P. aeruginosa (IZDs ranging from 11.0–13.0 mm) compared to chloramphenicol (IZD 8.0 mm CZ), where 52 had the highest potential with IZD 13.0 mm. Compounds 70 and 37 had low and moderate activities against B. subtilis, respectively, while 39 and 37 had low effectiveness towards S. aureus using the agar well method (Conc. 60 µg/well). On the other hand, they had moderate potential towards A. niger and C. albicans and low effect against T. mentagrophytes [58].

Dong et al., reported the purification of structurally rare onoceranoid-triterpenoids; lamesticumins A–F (85 and 106–110) from the EtOAc fraction of twigs using SiO₂ and RP₁₈ CC that were elucidated based on spectroscopic analysis and the C-21 absolute configuration of 110 was assigned by Snatzke’s method (Figure 11). Compounds 85, 106, and 107 possessed notable activity versus S. aureus, S. epidermidis, M. luteus, B. subtilis, M. pyogenes, and B. cereus with MIC values ranging from 3.12–12.6 µg/mL, compared to magnolol (MIC 12.5–25.0 µg/mL) in the microdilution assay [87].

Structures of compounds **106**–**112** from *Lansium domesticum*.

In 2018, Mayanti et al., isolated and characterized 48, 51, and 53 from the barks and leaves of L. domesticum. Compounds 51 and 48 possessed antibacterial effectiveness towards E. coli with IZDs 7.5 and 8.0 and 7.5 and 10.0 mm at concentration 500 and 1000 ppm, respectively, in comparison to vancomycin, chloramphenicol, and sulphonamide (IZDs 17.5, 18.5, and 9 mm, respectively), whereas they were inactive versus B. cereus in the disc diffusion assay. Compound 53 exhibited activity (Conc. 10,000, 5000, and 1000 ppm) towards E. coli with IZDs 3.67, 3.17, and 2.32 mm, respectively; however, they showed no activity towards E. feacali [77].

Furthermore, 2 new tetranortriterpenoids, langsatides A (111) and B (112), together with 40–43 and 45 were obtained from the seeds EtOAc fraction (Figure 11). Compounds 111 and 112 were elucidated based on spectroscopic analyses and [α]_D values. They showed no antibacterial potential towards S. aureus, E. faecalis, E. Faecium, and Acinetobacter baumanni (IC₅₀ > 100 μM) [71].

The L. domesticum seeds extract showed antibacterial potential towards S. aureus and E. coli at concentration 1250 and 1000 µg/mL, respectively, in the dilution broth technique using Mueller-Hinton broth [28].

8.11. 5α-Reductase Inhibitory Activity

5α-Reductase is the key enzyme responsible for the biosynthesis of dihydrotestosterone (DHT) [134]. Its inhibitors are useful treatments for DHT-dependent disorders, including androgenic alopecia and hair growth, benign prostatic hyperplasia, and acne [135]. Lansiosides A–C isolated from dried peel possessed 5α-reductase inhibitory potential. They were effective in controlling male hormone-type baldness, acne, and prostate hypertrophy [58,64].

8.12. Wound Healing Activity

Fruits’ phenolic compounds are known to exhibit wound healing potential and accelerate tissue regeneration through their antioxidant, anti-inflammatory, and antimicrobial capacities, as well as stimulation of angiogenic activities needed for wound re-epithelialization and granulation tissue formation [136,137]. Therefore, they may be favorable ingredients in nutraceutical preparations, functional foods, or cosmeceuticals [138]. L. domesticum had high phenolic contents.

It was reported that AgNPs have a wound healing potential for normal and burn-related wounds because of their antifungal and antibacterial activities. Additionally, Shankar et al., reported that the incorporation of the L. domesticum peel extract AgNPs (0.1% w/w) in Pluronic F127 gels as a delivery system enhanced the wound healing potential. These AgNPs increased wound closure time, hydroxyproline and collagen content, and wound tensile strength (33.41 N/cm²) without any inflammation. Finally, the enhanced biocompatibility and wound healing activity of L. domesticum AgNPs were attributed to its triterpenoids [139].

Metal oxide nanoparticles (NPs) have gained remarkable attention in the biomedical field [140]. L. domesticum peels triterpenoids along with amino-sugars (N-acetyl-D-glucosamine) have a strong stabilizing and reducing potential that can reduce the metal ions to nanoparticles by acting as capping agents [141]. Fruit peel extract of L. domesticum was used as a combined reducing and capping agent to develop eco-friendly gold (Au), silver (Ag), and gold-silver (Au-Ag) nanoparticles that were characterized by various physicochemical techniques. AgNPs inhibited the S. aureus and E. coli growth (MICs 16 and 8 μg/mL and MBCs 32 and 16 mg/mL, respectively), while Au-Ag-NPs had MICs 16 μg/mL for both S. aureus and E. coli. However, AuNPs did not display any antibacterial potential [142]. Further, the cytotoxicity and cellular activity of C2C12 cells in the presence of these NPs were assessed using MTT and Almar Blue assay, respectively. AgNPs showed decreased cellular activity (Conc. > 40 μg/mL), however, AuNPs (Conc. > 50 μg/mL) exhibited no difference in cellular activity. It is noteworthy that Au-Ag-NPs did not possess cytotoxic potential compared to AgNPs, revealing that the AuNPs content in Au-Ag-NPs prohibited the AgNPs-induced cellular damage and increased the cell viability [142].

Rahma et al., synthesized AgNPs using langsat leaf (LL) extract as the bio-reductor that were characterized by UV-Vis spectrophotometer. They significantly inhibited the E. coli and S. aureus growth (Conc. 6.25 and 12.5%, respectively) in the broth dilution method. Additionally, they displayed bactericidal potential towards E. coli (MBC 25%) but did not have bactericidal activity towards S. aureus [143].

Skin aging is a physiological process that can be induced by extrinsic and intrinsic factors [144,145]. Intrinsic aging takes place within tissue through the reduction in dermal cells, fibroblasts, and collagen production, while extrinsic aging can be produced by environmental factors, especially solar UV radiation, which leads to skin damage through the ROS (reactive oxygen species) generation [146,147]. The use of antioxidants can prevent aging [148]. Increase free radicals in the body will accelerate the production of elastase and collagenase enzymes, leading to an increase in the degradation of collagen which is the major component of connective tissue on the skin [149]. Based on the strong antioxidant activity of L. domesticum fruit peel, it was formulated in topical semisolid pharmaceutical preparations such as gel and cream with the EtOH extract of strawberry fruit and pomelo peel as anti-aging formula [150]. All formulas showed anti-aging potential through radical DPPH scavenging, anti-collagenase, anti-tyrosinase, and anti-elastase activities [150].

The peel ethanol extract was formulated into anti-mosquito lotion using cetyl alcohol (Conc. 3, 5, and 7%). The lotion formula (5% cetyl alcohol) was prepared in 3 lotion formulas (conc. 10, 20, and 35%). These formulas did not exhibit any edema and erythema when it was applied for 3 days on rabbits. Additionally, peel extract lotion (Conc. 20 and 35%) was effective as a mosquito repellent [151].

A combination of L. domesticum fruit extract and Hibiscus (Hibiscus rosa-sinensis) flower extract (LHE) caused 49.37% tyrosinase inhibition, which revealed that LHE had effectiveness as a lightening agent in cosmetics preparations [27]. After applying for 4 weeks in human skin, LHE contained lotion base significantly increased skin moisture content and reduced its melanin index in the efficacy test [27].

9. Safety of L. domesticum

The dermatological safety assessment of L. domesticum fruits EtOH extract was carried out clinically using ROPT (Repeated Opened Patch Test) and SCPT (Single Closed Patch Test) in >50 selected healthy volunteers. A lotion base containing 50 mg of extract was applied onto the chorioallantoic membrane and left for 20 s in contact and afterward any appearance of hemorrhage, hyperemia, and opacity on the membrane was reordered using HET-CAM (Hen’s Egg Testing of Chorioallantoic Membrane) method. ROPT revealed that the extract did not produce any allergic skin reaction or irritation. SCPT exhibited no irritation or allergic skin reaction (Conc. 1% and 3%) in all volunteers, while 5% concentration produced irritation in 1.9% of all subjects [152,153,154]. Further, L. domesticum fruit extract and Hibiscus (Hibiscus rosa-sinensis) flower extract (LHE) lotion safety assessment by SCPT and HET-CAM indicated that LHE was safe for human eyes and skin and could be utilized as active an ingredient in cosmetics [10,27].

10. Conclusions

L. domesticum is a commonly consumed fruit with high nutritional value, low toxicity, and long-term traditional applications for treating various diseases. The current work summarized the reported data concerning its production and season, nutritional value, phytoconstituents, enzymes, biological activities, safety, nanoparticles, and pharmaceutical formulations. It was found that yields of various plant parts MeOH extracts are varied (5.71% for peels, 6.4% for seed, and 17.94% for pulp) [53,71,155]. These percentages would vary according to the tree, source of plant material, and time of collection, as well as the extraction condition, including the technique, type of solvent, time, and temperature [53,156]. A total of 112 compounds have been reported from L. domesticum, including terpenes, sterols, organic acids, flavonoids, coumarin, and volatile compounds (Figure 12).

Number of metabolites reported from *Lansium domesticum* and their chemical classes.

These metabolites were isolated from the different parts of L. domesticum such as seeds, leaves, peels, bark, twigs, and fruits (Figure 13). Triterpenoids (64 compounds) are the major metabolites reported from L. domesticum, including onoceranoid (35 compounds), tetranortriterpenoid (24 compounds), cycloartane (4 compounds), and swietenine (1 compound) triterpenoids and are frequently involved in various pharmacological actions.

Number of metabolites reported from different part of *Lansium domesticum*.

Most of the reported metabolites have been evaluated for their anticancer, antifeedant, insecticidal, antidiabetic, antimalarial, antimutagenic, and antibacterial abilities (Figure 14). It is noteworthy that 94 and 95 showed potent notch inhibitory potential; therefore, they may be a candidate for anticancer or neural regenerative agents. Further, 38 and 73 had potent antimalarial effectiveness that could be further investigated for their possible use as antimalarial agents.

Biological activities of *L. domesticum* extracts and phytoconstituents.

However, the relative study of the relationship between the structure of these metabolites and bioactivity, as well as their biosynthetic pathways is limited. The emphasis of future work should be to conduct biosynthetic pathways, possible mechanisms, and pharmacological properties of L. domesticum and its metabolites.

Although the phytochemical screening of L. domesticum revealed the existence of anthraquinones, alkaloids, and iridoids, however, none of them have been isolated as pure metabolites. Limited studies reported the synthesis of metal nanoparticles (Au- and AgNPs) using L. domesticum that evaluated only for their antimicrobial and wound healing potential. Therefore, future research should focus on evaluating these NPs for other bioactivities and on developing protocols for implementing the biosynthesis of NPs using other metals, metal oxides, nitrides, and carbides. Some studies reported the preparation and biological evaluation of various pharmaceutical formulations such as gel, cream, and lotion using either L. domesticum extracts alone or in combination with other plant extracts that proved the traditional uses of L. domesticum as an anti-aging, lightening, and moisturizing agent in cosmetics preparations, as well as mosquito repellent. The topical safety studies of the fruit extract revealed its safety for topical uses. Thus, future research should focus on the comprehensive utilization of L. domesticum, the following strategies are suggested. First, there should be an emphasis on research concerned with the single metabolite’s isolation and bioactivity evaluation rather than the crude extract. Second, metabolic pathways, structure-activity relationships, in-vivo pharmacological studies, and mechanisms of action of L. domesticum metabolites, particularly triterpenoids, require more attention. Third, research on the unstudied parts of L. domesticum that have been widely used in traditional medicine should be carried out to prove the folk use. Lastly, the toxicological evaluation of the extracts of other parts of L. domesticum is needed to estimate safety and reliable dosage in clinical applications. L. domesticum by-products (LDP) could represent wide opportunity for separating bioactive metabolites with various potential applications. Additionally, they could be a source of livestock feeds, fuel (bioethanol), or organic fertilizers [157,158]. Peels can also be utilized for the recovery of soluble dietary fibers and polyphenols [157,158]. The polyphenols recovery from the LDP can be achieved utilizing micro-, ultra-, and nano-filtration processes [159]. Therefore, proper use of these by-products will be a sustainable approach for improving health through the separation of health-promoting metabolites, as well as solving the environmental issues.

Abbreviations

A549: Lung adenocarcinoma epithelial cell line; 5-FU: 5-Fluorouracil; AgNPs: Silver nanoparticles; Au: Gold; B₁₆F₁₀: Human murine melanoma cells; BCB: β-Carotene bleaching assay; BHT: Butylated hydroxytoluene; C2C12: Myoblast cell line; CAT: Catalase; CC: Column chromatography; CH₂Cl₂: Dichloromethane; CHCl₃: Chloroform; CYP1A2: Cytochrome P450 family 1 subfamily A member 2; CZ: Clear zone; DAPT: N-[N-(3,5-Difluorophenacetyl)-l-alanyl]-S-phenylglycine t-butyl ester; DHT: Dihydrotestosterone; DPPH: 2,2-Diphenyl-1-picrylhydrazyl; EDTA: Ethylenediaminetetraacetic acid; ERα: Estrogen receptor alpha; EtOAc: Ethyl acetate; EtOH: Ethanol; FMCA: Fluorometric microculture cytotoxicity assay; FRAP: Ferric reducing antioxidant power assay; GC-MS: Gas chromatography-mass spectrometry; GPX: Glutathione peroxidase; GSH: Glutathione; H₂O: Water; HeLa: Human cervix carcinoma cell line; HepG2: Human hepatocarcinoma cell line; HES1: Hairy and enhancer of split 1; HETCAM: Hen’s egg-chorioallantoic membrane test; HPB-ALL: Human T cell acute lymphoblastic leukemia cells; HPLC: High performance liquid chromatograph; HRFABMS: High Resolution Fast Atom Bombardment Mass Spectrometry; HSC-F: Cynomolgus monkey normal T cells; HT-29: Human colorectal adenocarcinoma cells; IC₅₀: Concentration causing 50% growth inhibition; ICP-OES: Inductively couple plasma optical emission spectrometry; IPC₅₀: The sample concentrations providing 50% inhibition of lipid peroxidation; IZD: Inhibition zone diameter; KB: Human mouth epidermal carcinoma; LD₅₀: The amount which causes the death of 50%; LD₉₀: The amount which causes the death of 90%; L-NMMA: Nitric Oxide Synthase Inhibitor NG-Monomethyl-L-Arginine; LOX: Lipoxygenase; LS174T: Colonic adenocarcinoma cell line; LTD₄: leukotriene D₄; MAML: Mastermind-like protein; MC₅₀: The sample concentration providing 50% metal chelating activity; MCF-7: Human breast cancer cell lines; MDA: Malondialdehyde; MeOH: Methanol; MIC: Minimum inhibitory concentrations; MMP-2: 72 kDa type IV collagenase also known as matrix metalloproteinase-2; MTS: Tetrazolium dye assays; MTT: 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide; n-BuOH: n-Butanol; NICD: Notch intracellular domain; NMR: Nuclear magnetic resonance; NO: Nitrous oxide; NOESY: Nuclear over-Hauser effect; ODS: octadecyl silica; PG: Polygalacturonase; PGE₂: Prostaglandin E2; PhIP; P39: 2-Amino-1-methyl-6-phenylimidazo [4,5-bI]pyridine; PME: Pectin methylesterase; ppm: parts per million; PTLC: preparative thin layer chromatography; RBP-J: Immunoglobulin kappa J region; ROPT: Repeated opened patch test; ROS: Reactive oxygen species; RP18: Reversed phase C₁₈ silica gel; SC₅₀: The sample concentrations providing 50% of scavenging; SCPT: Single Closed Patch Test; SiO₂ CC: Silica gel column chromatography; SOD: Superoxide dismutase; SRB: Sulforhodamine B; T-47D: Human breast cancer cell line T-ALL: Human T-cell acute lymphoblastic leukemia; TLC: Thin layer chromatography; Trp-P-1; P38: 3-Amino-1,4-dimethyl-5H-pyrido [4,3-b]indole; VLC: Vacuum column chromatography; VOCs: Volatile organic compounds; WHO: World health organization.

Author Contributions

Conceptualization, S.R.M.I. and G.A.M.; methodology, S.R.M.I., H.M.A. and G.A.M.; formal analysis, H.M.A. and G.A.M.; investigation, H.M.A. and G.A.M.; resources, H.M.A.; data curation, H.M.A. and G.A.M.; writing—original draft preparation, S.R.M.I., H.M.A. and G.A.M.; writing—review and editing, S.R.M.I., H.M.A. and G.A.M.; funding acquisition, H.M.A. All authors have read and agreed to the published version of the manuscript.

Funding

The authors extend their appreciation to the Deputyship for Research & Innovation, Ministry of Education in Saudi Arabia for funding this research work through the project number IFPRP: 198-166-1442 and King Abdulaziz University, DSR, Jeddah, Saudi Arabia.

Data Availability Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

Footnotes

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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PERMALINK

Lansium domesticum—A Fruit with Multi-Benefits: Traditional Uses, Phytochemicals, Nutritional Value, and Bioactivities

Hossam M Abdallah

Gamal A Mohamed

Sabrin R M Ibrahim

Roles

Abstract

1. Introduction

Table 1.

Table 2.

2. Research Methodology

3. Production and Season

4. Traditional Uses of L. domesticum

Table 3.

5. Nutritional Value of L. domesticum

6. L. domesticum Enzymes

7. Phytoconstituents of L. domesticum

Table 4.

7.1. Volatile Organic Compounds and Organic Acids

Figure 1.

Figure 2.

7.2. Phenolics

7.3. Terpenoids

Figure 3.

Figure 4.

7.4. Sterols

Figure 5.

8. Biological Activities of L. domesticum Extracts and Isolated Compounds

8.1. Anti-Malarial Activity

Figure 6.

Table 5.

8.2. Antifeedant, Insecticidal, and Larvicidal Activities

Figure 7.

8.3. Anti-Fertility Activity

8.4. Antimutagenic Activity

Figure 8.

8.5. Cytotoxic Activity

Figure 9.

Figure 10.

8.6. Antioxidant Activity

8.7. α-Glucosidase Inhibitory Activity

8.8. Anti-Aging Activity

8.9. Analgesic and Anti-Inflammatory Activities

8.10. Antibacterial Activity

Figure 11.

8.11. 5α-Reductase Inhibitory Activity

8.12. Wound Healing Activity

9. Safety of L. domesticum

10. Conclusions

Figure 12.

Figure 13.

Figure 14.

Abbreviations

Author Contributions

Funding

Data Availability Statement

Conflicts of Interest

Footnotes

References

Associated Data

Data Availability Statement

ACTIONS

PERMALINK

RESOURCES

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