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Antioxidant and Antiradical Activities of Flavonoids
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Abstract
The relationship between the structure of 42 flavonoids and their antioxidant and
antiradical activities was elucidated by heat-induced oxidation in a beta-carotene
and linoleic acid system and by the 1,1-diphenyl-2-picrylhydrazyl decoloration test.
From seven structurally divergent groups of flavonoids, only flavonols with a free
hydroxyl group at the C-3 position of the flavonoid skeleton showed high inhibitory
activity to beta-carotene oxidation. Antiradical activity depended on the presence
of a flavonol structure or free hydroxyl group at the C-4' position. The effect of
the 4'-hydroxyl was strongly modified by other structural features, such as the presence
of free hydroxyls at C-3 and/or C-3' and a C2-C3 double bond.