Abstract

The flavonoids quercetagetin, gossypetin and scutellarein 7-glucoside which have o-dihydroxyl groups in the A ring inhibit indole-3-acetic acid oxidase. Since scutellarein 7-glucoside has no such grouping in the B-ring it is clear that it is the hydroxyls in the A-ring that cause the inhibition. The presence of o-dihydroxyls in the A-ring also decreases the inhibitory effect upon ATP formation in mitochondria.

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