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. 2017 Jul 13;22(4):1029–1034. doi: 10.1177/2156587217717415

A Review of the Antioxidant Activity of Celery (Apium graveolens L)

Wesam Kooti 1, Nahid Daraei 2,✉
PMCID: PMC5871295  PMID: 28701046

Abstract

Plants are an important source of natural active products that are different, based on mechanism and biological properties. Celery (Apium graveolens L) is a plant from the apiaceae family and phenolic and antioxidant compounds of this plant have been studied by several scientists. The aim of this study was to review systematically the antioxidant activity of celery. Required articles were searched from databases such as Science Direct, PubMed, Scopus, and Springer. Keywords used in this study were Apium graveolens L, celery, antioxidant, free radical, leaf, and seed. Out of 980 collected articles (published in the period 1997-2015), 9 studies finally met the inclusion criteria and were considered. Celery, because of compounds such as caffeic acid, p-coumaric acid, ferulic acid, apigenin, luteolin, tannin, saponin, and kaempferol, has powerful antioxidant characteristics, to remove free radicals. It is clear that celery, with different compounds and diverse concentration can have varied healing effects. It is suggested that the next studies concentrate on other therapeutic and industrial attributes of celery.

Keywords: Apium graveolens L, celery, antioxidant, free radical, leaf

Use of medicinal plants to treat common ailments has been prevalent since ancient times and different parts of the plants were used for public health. The use of natural treatments is cost-effective.1,2 Since ancient times, plants have been important in reducing pain and today the focus is on their role and ability in healing and their treatment properties for various diseases.3–5 Many studies have shown the positive effects of various herbs and medicinal plants on infertility,6 hormone disorders,7 liver disorders,8 anemia,9 renal diseases,10 and neurologic and mental disorders.11

Flavonoids and other phenolic compounds spread widely in plants, and their diverse biological activities such as antioxidant effects have been investigated in many studies such as coronary heart diseases,7,12 diabetes,13 and cancer.14 Medicinal herbs have fewer side effects than chemical drugs and their antioxidant attributes decrease the toxicity of these drugs.7 Today herbal drugs are used as an alternative to chemical drugs and the main reason is their low level of side effects compared with chemical drugs.15

Celery (Apium graveolens L) is a plant from the apiaceae family, and is one of the annual or perennial plants that grow throughout Europe and the tropical and subtropical regions of Africa and Asia16 (Figure 1).

Figure 1.

Figure 1.

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Apium graveolens L.

In India, approximately 40 000 tons of celery are produced and 29 250 tons are exported each year. Celery for its growth needs high levels of moisture, but requires lower temperature. Therefore, the highest quality celery is found growing in cold and mild environments.17 The parts that are used in this plant include seeds, leaves, and essential oils.18 Among the phytochemical compounds of celery, one can mention carbohydrates, phenols such as flavonoids, alkaloids, and steroids.19

Presence of compounds such as limonene, selinene, frocoumarin glycosides, flavonoids, and vitamins A and C are the reason that celery is the most widely used plant in traditional medicine.20 Some main constituents of celery with chemical structures are shown in Figure 2.

Figure 2.

Figure 2.

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Some of the main constituents of celery.

Celery can prevent cardiovascular diseases,21 jaundice, liver and lien diseases,22 urinary tract obstruction,18 gout,22 and rheumatic disorders.23 Research on rats shows that ethanol extracts of celery leaves increases spermatogenesis24 and also improves their fertility.15,25,26 Celery reduces glucose, blood lipids,7,27 and blood pressure, which can strengthen the heart.28 Experimental studies show that celery has antifungal29 and anti-inflammatory properties.30 Moreover, its essential oils have antibacterial effects.31 Its seeds are useful in the treatment of bronchitis,22 asthenopia, asthma, chronic skin disorders, including psoriasis,32 vomiting, fever, and tumors.33 The root of the celery is diuretic and it is used for the treatment of colic.33 Plants are an important source of natural active products, which vary, based on mechanism and biological properties. Various phytochemical compounds, especially polyphenols (such as flavonoids, phenolic acids, and tansipropanoids) are responsible for collecting free radicals and antioxidant activities of plants.34 Polyphenols have biological effects. These effects, especially the antioxidant activities, are inductors for restraining free radicals and peroxidation. Polyphenols generally exhibit similar chemical properties, which means that one or more number of the phenolic groups can react with hydrogen donors and neutralize free radicals.35 Many studies examine the effects of celery antioxidants. Phenolic and antioxidant compounds of celery have been studied by several scientists.36 Celery root and its leaves have the property to remove OH and DPPH (2,2-diphenyl-1-picrylhydrazyl) radicals and the plant also reduces the intensity of liposomal peroxidation that represents the plant’s protection.37 The aim of this study was to review systematically the antioxidant activity of celery.

Method

Search Strategy

In order to collect data, the following keywords were searched separately or in combination in domestic databases such as Magiran, Sid, and Iranmedex, and the international databases of Science Direct, PubMed, Scopus, and Springer: Apium graveolens L, celery, antioxidant, free radical, leaf, and seed. The search was limited to articles in Persian and English, and the time period was the year 1997 to December 2015.

Study Selection and Data Extraction

Investigation and information gathering was conducted by 2 experts. Experimental studies and clinical trials met the inclusion criteria. In the first stage, 980 articles were collected. After reviewing titles and abstracts, the unrelated articles were deleted. In addition, the studies lacking full information, and the abstracts of conference proceedings were also eliminated. Finally, 9 studies met the inclusion criteria. According to the research type, the findings of studies were divided into 2 parts: in vitro and in vivo. Table 1 summarizes the findings of the reviewed studies.

Table 1.

Summary of Antioxidant Activity of Celery.

Type of Extract Used Part(s) Model Dose Results Reference
Aqueous extract Root and leaves In vivo 1.5 mg/kg

  • – Celery root juice increased antioxidative capacity, ie, reduced glutathione content

  • – The total antioxidative capacity (FRAP) in liver homogenate.

  • – Celery leaf juice increased GSH content, but did not influence FRAP in liver homogenate

 38
Aqueous extract Seed In vivo 60 mg/kg

  • – n-Butanol extract of celery seed (B) or insulin (I) therapy moderated blood glucose within normal range, enhanced body weight gain and normalized the activities of all antioxidant enzymes

 39
Ethanolic extract Leaves In vivo and in vitro 50-600 μg/mL

  • – Apiin had a remarkable scavenging activity on MDA and LPF.

  • – Promoted TAOC and significantly enhanced the activities of SOD, GSH-Px, and CAT

 40
Methanolic and ethanolic extracts Leaves In vitro 70% and 50%

  • – Increased TAOC

 36
Ethanolic extract All of the parts In vitro —

  • – Excellent free radical–scavenging activities

 41
— Leaves In vitro 0, 25, 50, 100, 200, and 500 μg/0.05 mL

  • – Has potential as a natural antioxidant and thus inhibits unwanted oxidation process

 42
Methanolic, diethyl ether, and aqueous extracts Seeds In vitro 20, 40, 60 and 80 μg/mL

  • – Among the different extract tested methanol extract showed the highest antioxidant activity

 43
Methanolic, ethanol, and hexane extracts — In vitro —

  • – Antioxidant activity was observed

 44
Aqueous extract Seeds In vitro 50, 100, and 150 ppm

  • – Exhibited antioxidant activity

 45
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Abbreviations: CAT, catalase; FRAP, ferric reducing antioxidant power; GSH, reduced glutathione; GSH-PX, glutathione peroxidase; LPF, lipofuscin; MDA, malondialdehyde; SOD, superoxide dismutase; TAOC, total antioxidant capacity.

Results and Discussion

In Vivo Studies

The study by Kolarovic et al38 of the antioxidant activity of celery in treated rats with doxorubicin, was investigated and furthermore, the effect of the celery itself, and its combination with doxorubicin on the statue of antioxidant was studied. In this study, reduced glutathione (GSH) and ferric reducing antioxidant power (FRAP) in liver homogenate and blood hemolysate, as well as the contents of cytochrome P450 in liver homogenate were investigated. Results showed that doxorubicin significantly reduced glutathione content and total antioxidant status (FRAP) in liver homogenate and blood, but it does not have any effect on the cytochrome p540 content, while these items after treatment with celery juice and celery roots, had significantly increased. Celery root water increases antioxidant capacity and content of GSH and total antioxidant capacity (FRAP) in liver homogenate. Water of celery leaves increases GSH content but it does not have any effect on FRAP in liver homogenate. Water of the roots and leaves of celery, in combination with doxorubicin, have protective effects, which increase FRAP in the liver homogenate compared to animals treated with doxorubicin. Generally, the results of this study indicated that celery can have antioxidant effects.38 In the study by Al Sa’aidi et al,39 the potential of n-butanol extract from celery seed (Apium graveolens) in ameliorating of lipid peroxidation and its antioxidant properties in diabetic rats by streptozotocin was investigated. In this study, there were 32 male rats divided into 4 groups, including a control group and 3 diabetic groups. An amount of 60 mg/kg of aqueous extract of n-butanol was administered to the diabetic group, and 4 IU/animal insulin injected respectively for 21 days. On day 22, weight gain was recorded and male rats were killed. Liver blood and intracellular liquid were used for investigating blood glucose level and subcellular activity of alanine aminotransferase (ALT), aspartate aminotransferase (AST), catalase (CAT), superoxide dismutase (SOD), glutathione (GSH) transferase and reductase were assessed, along with the density of malondialdehyde (MDA) and glutathione.

Results were that these diabetic rats had hyperglycemia, weight loss, increased activity of ALT, SOD, CAT, GSH, reduced GSH reductase, and normal AST. Treatment with n-butanol extract from celery seed modified the glycemic and insulin level and increased body weight in the normal range and normal activity of all antioxidant enzymes. This study concluded that n-butanol extracts from celery seed has significant potential for the treatment of diabetic rats and also improving antioxidant enzymes in diabetic rats.39 Another study, conducted in 2014 by Li et al40 investigated the in vivo and in vitro effect of antioxidant flavonoids isolated from celery. In this study, flavonoid from leaves was extracted and purified and then its ethanol extract of celery, by column chromatography and crystallization were produced. This product was identified as apiin by liquid chromatography/electrospray ionizations/mass spectrometry and its antioxidant activities in in vitro inhibition of DPPH˙, superoxide mg/mL for O2 −˙ and hydroxyl radical (OH˙) were activated. The IC50 value was 68.0 μg/mL for DPPH, 0.39 mg/mL for O2 −˙ and 48.0 μg/mL for the OH˙. Also, the antioxidant activity was evaluated in murine models in vivo. All the data, including the contents of MDA, lipofuscin (LPF) activities of SOD, glutathione peroxidase, CAT, and total antioxidant capacity (TAOC) in serum, brain, and heart were assessed. Results showed that apiin has significant inhibitory activity of MDA and LPF, to strengthen TAOC, and it dramatically enhances the activity of SOD, GSH peroxidase, and CAT.40

In Vitro Studies

In a study conducted in 2008 by Yildiz et al,36 essential antioxidant compounds of celery leaves were evaluated. In this study, the TAOC by the method of CUPRAC (cupric ion reducing antioxidant capacity) and ABTS (2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate)) spectrophotometry and TAOC relationship with high-performance liquid chromatography (HPLC) were measured. In the subsequent levels, CUPRAC spectrophotometric methods of TAOC assay and copper (II)-neocuproine (2,9-dimethyl-1,10-phenanthroline) were used as the chromogenic oxidant in the laboratory. Antioxidant compounds in celery plant extract by HPLC were analyzed on one column of C18 and then it was measured. TAC was measured by HPLC in the 41% to 57% of celery leaves compounds (in different levels of hydrolyses). According to data from HPLC it was shown that the celery leaves have antioxidant properties.36 Yao et al,40 in 2010, analyzed the structure of phenolic compounds and phenolic activities of 11 antioxidant celery cultivars. The major phenolic acids in extracts included caffeic acid, p-coumaric acid, and ferulic acid, while the identified flavonoids included apigenin, luteolin, and kaempferol. The total phenol content was measured by using the Folin-Ciocalteu method, and the TAOC with the help of DPPH and ABTS radicals were investigated.

Apigenin was the main flavonoid in this sample, and the most abundant phenolic acid was p-coumaric acid. Studied plants had high levels of phenolic compounds and antioxidant capacity. Generally, there was a positive correlation between total flavonoid contents and antioxidant activity, total phenolic acids or total phenolic were observed in this study.41 In another study conducted in 2012 by Nagella et al,42 chemical compounds and antioxidant activity of essential oils isolated from celery leaves were investigated. First, the celery leaves were distillated and they were analyzed by gas chromatography/mass spectrometry and essential oils of leaves were removed. A total of 73.72% of leaf content were essential oils. In the next step, the essential oils, isolated from the leaves of celery to inhibit the DPPH radical, were studied and the results showed that the isolated oil from celery has natural antioxidant capacity. The above information shows that the major compounds of celery can have a key role as a natural antioxidant.42 A study was carried out by Shanmugapriya and Ushadevi43 in 2014 on Apium graveolens seed extract antioxidant activity. First, celery seed extracts with solvents such as ethanol, ether, and water were prepared. Then the activity of celery seeds was analyzed using the DPPH assay method. Among the various extracts under assessment, methanol extract had the highest antioxidant activity. In the density of 80 μg/mL of extracts, methanol extract had the maximum antioxidant activity, 63.28% ± 0.86%, while this activity for diethyl ether extract was 54.04% ± 0.21%, and for the aqueous extract was 52.97% ± 0.64%. Similarly in the entire concentration of methanol extract of the plant, the seed had highest antioxidant activity. Other extracted luteolin and flavonoids reduced reactive oxygen, but on the other hand increased SOD enzymes that had protective effects against damages. So it can be concluded that these compounds may be responsible for antioxidant activity of celery seeds.43 In 2015, Uddin et al44 investigated the activities of celery antioxidant phytochemical compounds by photochemical screening in presence of flavonoid, tannins, saponins, and showed the absence of terpenoids. Total methanol content (63.46 ± 12.00 mg gallic acid equivalent [GAE]/g) was slightly higher. Fraction for ethanol was (36.60 ± 12.28 mg GAE/g) and for hexane fraction (34.86 mg ± 6.96 GAE/g). Flavonoid content in methanol extract was 56.95 ± 7.14 mg quorcetin/g and lowest of this content in methyl extract was 29.2 ± 3.15 mg quercitin/g. The activity of FRAP was analyzed as higher in comparison with other extracts. Generally, it was concluded that the celery plant has antioxidant characteristics.44 Naglaa et al,45 in 2015, investigated the Apium graveolens seeds, and the objective of this study was to evaluate the antioxidant activity of essential oil of the celery seed. First the chemical compounds of essential oils were obtained by hydrodistillation and were analyzed by gas chromatography/mass spectrometry. The most prevalent essential oil was limonene. The antioxidant activities of volatile oils extracted from the celery and seeds powders were assessed by the Rancimat apparatus and DPPH. Results from this test explained that all essential oils having different concentrations had antioxidant activity and this means that the entire added essential oils, whether added individually or mixed, possessed an antioxidant effect. Overall, this research showed that essential oils and natural antioxidant can be used in industrial food and drugs.45

Conclusion

This study investigated further the properties of celery leaves and seeds. Celery, because of compounds such as caffeic acid, p-coumaric acid, ferulic acid, apigenin, luteolin, tannin, saponin, and kaempferol, has powerful antioxidant characteristics, while different compounds of this plant with diverse concentration can have different healing effects. It is suggested that the next studies concentrate on other therapeutic and industrial attributes of celery.

Acknowledgements

The authors of the present article would like to express their sincere gratitude to all those who have supported them during the research.

Footnotes

Author Contributions: WK and ZA were involved with study concept, design, and critical revision of the manuscript for important intellectual content.

Declaration of Conflicting Interests: The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Funding: The authors received no financial support for the research, authorship, and/or publication of this article.

Ethical Approval: Ethical approval was not required for this article as no human subjects were involved.

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