Chemical studies on antioxidant mechanism of tea catechins: analysis of radical reaction products of catechin and epicatechin with 2,2-diphenyl-1-picrylhydrazyl.

Abstract:

:Tea catechins, an important class of polyphenols, have been shown to have wide spectrum of antitumor activity believed to be due mainly to their antioxidative effect. In this study, the radical scavenging behavior of catechins on 2,2-diphenyl-1-picrylhydrazyl (DPPH) was studied. Two reaction products of (+)-catechin, and two reaction products of (-)-epicatechin were purified and identified. Their structures were determined on the basis of detailed high-field 1-D and 2-D NMR spectral analysis. Structure elucidation of these products can provide insights into specific mechanisms of antioxidant reactions. A possible mechanism of the formation of reaction products is suggested.

journal_name

Bioorg Med Chem

authors

Sang S,Cheng X,Stark RE,Rosen RT,Yang CS,Ho CT

doi

10.1016/s0968-0896(02)00089-5

subject

Has Abstract

pub_date

2002-07-01 00:00:00

pages

2233-7

issue

7

eissn

0968-0896

issn

1464-3391

pii

S0968089602000895

journal_volume

10

pub_type

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