Phytochemistry

An NADPH and FAD dependent enzyme catalyzes hydroxylation of flavonoids in position 8

H Halbwirth, K Stich

Index: Halbwirth, Heidrun; Stich, Karl Phytochemistry, 2006 , vol. 67, # 11 p. 1080 - 1087

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Citation Number: 18

Abstract

Yellow flavonols contribute to flower pigmentation in Asteraceae. In contrast to common flavonols, they show additional hydroxyl groups in position 6 and/or 8 of the aromatic A-ring in addition to the basic 5, 7-hydroxylation pattern. An enzyme introducing a hydroxyl group in position 8 of flavonols and flavones was demonstrated for the first time with enzyme preparations from petals of Chrysanthemum segetum. Flavanones, dihydroflavonols and ...