Optimization of subcritical water extraction of antioxidants from Coriandrum sativum seeds by response surface methodology

Kinetic and Thermodynamics studies for Castor Oil Extraction Using Subcritical Water Technology

“…Phenolic compounds were also extracted from grape pomace using SWE with higher polyphenols, flavonoids and antioxidant activity compared to conventional organic solvent extraction 12 . Similar results were obtained for phenolics and flavonoids from Coriandrum seeds obtained with SWE showing higher content when compared with conventional solid-liquid extraction and even modern extraction techniques, such as ultrasound-and microwave-assisted extraction 13 . In addition, Baek et al 14 examined the influence of different temperatures and time on the SWE yield of antioxidant nutrients from licorice and found that the SWE significantly affected the antioxidant activities and nutraceutical compound levels of the extracts.…”

Isolation of coriander (Coriandrum sativum L.) essential oil by green extractions versus traditional techniques

“…But this could be also considered as advantage since vegetal oil from coriander is rich in monounsaturated fatty acids which could provide additional health value of dry extract [8]. It is a similar situation with extracts obtained by subcritical water where, besides essential oil, other important compounds such as polyphenolics are extracted with high yields [20]. Since separation of essential oil from SWE extracts by L/L extraction with methylene chloride was performed in order to prepare samples for GC analysis, in application of these products, L/L separation would be avoided and these extracts would be complex mixtures containing high amount of health benefit compounds.…”

“…Pressure effects during SWE could be neglected since it is only important to use pressure high enough to maintain water in liquid state on extraction temperature, therefore temperature has been identified as the critical factor in SWE process [21]. On fixed pressure, extraction time and sample-to-solvent ratio, total extract yield increases with increase of temperature up to 150 • C, after that, TE yield decreased on 200 • C. Besides aromatic compounds from essential oil, total extracts obtained by SWE are rich in other desirable compounds such as polyphenols and flavonoids, which exhibit significant antioxidant activity [20]. Increased temperature exhibits several effects which are affecting either solvent or plant properties.…”

“…The procedure of extraction was described elsewhere [20]. Sample to solvent ratio was 1:10 (w/v) and all extractions were performed on isobaric conditions (30 bar) for 20 min.…”

Optimization of hydrolysis of rutin in subcritical water using response surface methodology

“…Recently, many studies of the application of subcritical water as a green and environment friendly extraction medium have been published [1][2][3][4][5][6][7][8][9][10][11]. Subcritical water has many beneficial properties compared to classic organic solvents, such as giving higher yields, higher purities of extract and low solvent and recycling costs.…”