The Relative Antioxidant Activities of Plant-Derived Polyphenolic Flavonoids
作者:
RiceCatherine A.,
MillerNicholas J.,
BolwellPaul G.,
BramleyPeter M.,
PridhamJohn B.,
期刊:
Free Radical Research
(Taylor Available online 1995)
卷期:
Volume 22,
issue 4
页码: 375-383
ISSN:1071-5762
年代: 1995
DOI:10.3109/10715769509145649
出版商: Taylor&Francis
关键词: flavonoid. polyphenol;antioxidant activity;anthocyanidin.
数据来源: Taylor
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 thanα-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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