FLAVONOL GLYCOSIDES OF THE CULTIVATED STRAWBERRY

Abstract

SUMMARY— Alter extraction and separation by thin‐layer chromatography (TLC) on cellulose, nine flavonol glycosides were detected and purified in the fruit of strawberry from various sources. The structures of these were investigated by TLC, spectral properties and several types of hydrolysis. Four of them mere completely identified as the ‐3‐ß‐monoglucosides and ‐3‐ß‐glucuronides of quercetin and kaempferol. Three others were characterized less fully as kaempferol‐7‐monogluco‐side, a kaempferol‐7‐glucoside and an unreported quercetin‐3‐glucoside which was not the ‐3‐ß‐monoglucoside or a diglucoside. A comparison between the flavonol glycosides and anthocyanins of this fruit was made with respect to the amounts and types present.