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While the scavenging effect of 2'-hydroxy-flavonol was 84%, that of 3'-hydroxyflavonol was 39%.Vitamin C showed the effect of 89% in the same experi-mental condition. That is, the anti-oxidative effects of flavo-nol derivatives are dependent upon the number of hydroxylgroups and their positions. Many flavonol derivatives are being isolated from naturalsources. Nuclear magnetic resonance (NMR) spectroscopyis widely used for their identification. Because the positionand the number of substituted hydroxyl groups cause thechanges of the

Substitution Effect of Hydroxyl Groups on the1H and13CC Chemical Shifts in Hydroxyflavonols

Substitution Effect of Hydroxyl Groups on the¹H and¹³CC Chemical Shifts in Hydroxyflavonols