Table 2.

Principle involved, along with various sources, compounds extracted, solvents used, and the corresponding process conditions used in Soxhlet extraction

Principle	Sources	Compounds extracted	Process conditions	References
Heating, condensation, extraction, and reflux of S within a Soxhlet apparatus	Spent coffee (silverskin)	Caffeine	Hexane, dichloromethane, ethanol, 1:50, 6 h, the temperature was a solvent boiling point	Mussatto et al., 2015
		Chlorogenic acid	60% isopropanol (60%), 1:10, 27 °C
	Waste Punica granatum L. (pomegranate) seeds	Oils (PUFAs, punicic acid)	Hexane, 1:15, 4 h, 60 °C	Talekar et al., 2018
	Rosmarinus officinalis L. (rosemary) leaves	Rosmarinic acid, Carnosic acid, Carnosol	96% food grade ethanol, demineralized water, 1:12, 8 h	Hirondart et al. 2020
	Piper betle (betel) leaves	Eugenol, Eugenol acetate	100% acetone, 1:5, 56 °C, 8 h	Das et al., 2019
	Agaricus bisporus L	Ergosterol	Hexane, ethanol, or limonene (150 mL for 4.5 g of sample), 4 h,	Heleno et al., 2016
	Anthemis cotula L. (stinking chamomile)	Anthecotuloid, Caffeoyl Quinic acid, and Quercetin	96% ethanol, 1:20, 6 h	Sut et al, 2019
	Allium cepa L. var. ascalonicum	Alkaloids, Polyphenols, Tannins, Flavonoids	70% ethanol + HCl (2 N),1:10, pH: 1, 2 h	Saptarini and Wardati, 2020
	Silybum marianum L. Gaertner fruits	Silymarin	n-hexane (defatting), methanol (for Silymarin extraction), 2:75, 6 h (defatting) + 5 h (actual extraction)	Wianowska and Wiśniewski, 2015
	Miscanthus sinensis (runo) stem	Runo dye	50% ethanol and 4 h	Pinzon et al., 2020