Ethanol, Quercetin was supplied by China Institute for Drugs and Biological Products Identification (Beijing, China), and the purity is over 98%. sodium carbonate, sodium nitrite, aluminum trichloride, anthrone, sulfuric acid, disodium phosphate Folin-Ciocalteu reagent and 1,1-diphenyl-2-picrylhydrazyl radical (DPPH), ABTS (2,2-Azinobis-(3ethylbenzthiazoline-6-sulfonic acid), ferric chloride (FeCl 3 ) and Ascorbic acid were purchased from Sigma (St. Louis, MO, USA). All the other reagents were of analytical grade, methanol and Formic acid (HPLC grade) were obtained from Merck (Darmstadt, Germany), The phenolic standards (Protocatechuic acid, Protocatechuic aldehyde, p-Hydroxybenzoic acid, p-Hydroxybenzaldehyde, Vanillic acid, Catechin, Rutin, Caffeic acid, Syringic acid, Vanillin, p-Coumaric acid, Ferulic acid), Gallic acid.
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Ezaouine et al. (2022) studied this question.
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