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- W164408021 abstract "The rates of hydrolysis of more than a hundred flavonoid glycosides have been measured, using N HCl, β-glucosidase, β-glucuronidase or anthocyanase. The results show that such measurements are useful (α) in distinguishing O- from C-glycosides, (b) in characterizing flavonoids having sugars attached to more than one hydroxyl group, and (c) for determining suitable conditions for the isolation of intermediate glycosides. Flavonols with glucuronic acid or glucose attached to the 7-hydroxyl are readily distinguished from those having rhamnose attached by their resistance to acid hydrolysis; times for complete hydrolysis are 180, 25 and 5 min respectively. β-Glucosidase attacks the 3-, 7- and 4′-O-glucosides of quercetin at the same rate, but preferentially removes glucose from the 7-hydroxyl group of quercetin 7-glucoside-3-sophoro-side. Anthocyanase hydrolyses anthocyanidin 3-galactosides, 3-glucosides and 3-(diglycosides) much more rapidly than 3-rhamnosides, 3-arabinosides and acylated glycosides. These procedures have been applied, in combination with other methods, to the identification of flavonol glycosides present in species Allium, Helleborus, Lathyrus, Matthiola, Potentilla and Tulipa. New glycosides now characterized are: the 7-glucuronide-3-rutinosides of kaempferol and quercetin, the 7-rhamnoside-3-lathyroside and 7-rhamnoside-3-(rhamnosylarabinoside) of kaempferol, and the 7-glucoside-3-(xylosyl-glucoside), the 3,4′-diglucoside, the 3,7-diglucuronide and the 7-glucoside-3-(caffeoylsophoroside) of quercetin." @default.
- W164408021 created "2016-06-24" @default.
- W164408021 creator A5065266631 @default.
- W164408021 date "1965-02-01" @default.
- W164408021 modified "2023-10-10" @default.
- W164408021 title "Plant polyphenols—XIV." @default.
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- W164408021 doi "https://doi.org/10.1016/s0031-9422(00)86152-x" @default.
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