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

Chemical studies on antioxidant mechanism of tea catechins: analysis of radical reaction products... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bioorganic & Medicinal Chemistry Elsevier

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

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Publisher
Elsevier
Copyright
Copyright © 2002 Elsevier Science Ltd
ISSN
0968-0896
DOI
10.1016/S0968-0896(02)00089-5
Publisher site
See Article on Publisher Site

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

Bioorganic & Medicinal ChemistryElsevier

Published: Jul 1, 2002

References

  • J. Nutr.
    Yang, C.S.; Chung, J.Y.; Yang, G.; Chhabra, S.K.; Lee, M.J.
  • Phytochemistry
    Foo, L.Y.; Lu, Y.; Wong, H.

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