The relative antioxidant activities of plant-derived polyphenolic flavonoids.

来自 Semantic Scholar

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阅读量：

484

作者：

CA Rice-Evans，NJ Miller，PG Bolwell，PM Bramley，JB Pridham

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摘要：

The relative antioxidant activities, against radicals generated in the aqueous phase, of a range of plant-derived polyphenolic flavonoids, constituents of fruit, vegetables, tea and wine, have been assessed. The results show that compounds such as quercetin and cyanidin, with 3,4 dihydroxy substituents in the B ring and conjugation between the A and B rings, have antioxidant potentials four times that of Trolox, the vitamin E analogue. Removing the ortho-dihydroxy substitution, as in kaempferol, or the potential for electron deloculisation by reducing the 2.3 double bond in the C ring, as in catechin and epicatechin, decreases the antioxidant activity by more than 50%. but these structures are still more effective than ±-tocopherol or ascorbate. The relative significance of the positions and extents of hydroxylation of the A and B rings to the total antioxidant activity of these plant polyphenols is demonstrated.

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关键词：

flavonoid. polyphenol antioxidant activity anthocyanidin.

DOI：

10.3109/10715769509145649

被引量：

4242

年份：

1996