Plant polyphenols—XIV.

摘要: Abstract The rates of hydrolysis more than a hundred flavonoid glycosides have been measured, using N HCl, β-glucosidase, β-glucuronidase or anthocyanase. results show that such measurements are useful (α) in distinguishing O- from C-glycosides, (b) characterizing flavonoids having sugars attached to one hydroxyl group, and (c) for determining suitable conditions the isolation intermediate glycosides. Flavonols with glucuronic acid glucose 7-hydroxyl readily distinguished those rhamnose by their resistance hydrolysis; times complete 180, 25 5 min respectively. β-Glucosidase attacks 3-, 7- 4′-O-glucosides quercetin at same rate, but preferentially removes group 7-glucoside-3-sophoro-side. Anthocyanase hydrolyses anthocyanidin 3-galactosides, 3-glucosides 3-(diglycosides) much rapidly 3-rhamnosides, 3-arabinosides acylated These procedures applied, combination other methods, identification flavonol present species Allium, Helleborus, Lathyrus, Matthiola, Potentilla Tulipa. New now characterized are: 7-glucuronide-3-rutinosides kaempferol quercetin, 7-rhamnoside-3-lathyroside 7-rhamnoside-3-(rhamnosylarabinoside) kaempferol, 7-glucoside-3-(xylosyl-glucoside), 3,4′-diglucoside, 3,7-diglucuronide 7-glucoside-3-(caffeoylsophoroside) quercetin.