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- W1757432118 abstract "Abstract Onion solid wastes (OSW) were used as raw material to produce polyphenol- and pigment-enriched extracts with antioxidant activity, using ultrasound-assisted solid-liquid extraction. The extraction medium used was free from conventional volatile organic solvents, and it was composed of water and glycerol. Glycerol concentration ( C gl ) and liquid-to-solid ratio ( R L/S ) were first optimised employing Box–Behnken experimental design and then extraction efficiency was further assessed through kinetics. The optimal conditions were found to be C gl = 90% (w/v) and R L/S = 90 mL g −1 , and under these conditions the extraction of total polyphenols and total pigments was shown to obey first-order kinetics. Maximal effective diffusion ( D e ) values were 9.28 × 10 −11 and 13.22 × 10 −11 m 2 s −1 , for total polyphenols and total pigments, respectively, while the corresponding activation energies ( E a ) were 31.52 and 12.11 kJ mol −1 . The reducing power ( P R ) increased as a response to increasing extraction temperature and the extract obtained at 80 °C had P R value of 490 μmol ascorbic acid equivalents per g of dry weight. Liquid chromatography-diode array-mass spectrometry analysis of this extract showed that the major polyphenols tentatively identified were quercetin 4′- O -glucoside and quercetin, accompanied by other quercetin glycosides, cyaniding 3- O -glucoside and a series of quercetin degradation and oxidation products." @default.
- W1757432118 created "2016-06-24" @default.
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- W1757432118 date "2015-12-01" @default.
- W1757432118 modified "2023-10-10" @default.
- W1757432118 title "A green ultrasound-assisted extraction process for the recovery of antioxidant polyphenols and pigments from onion solid wastes using Box–Behnken experimental design and kinetics" @default.
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- W1757432118 doi "https://doi.org/10.1016/j.indcrop.2015.09.039" @default.
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