Chemistry of the Antioxidant Effect of Polyphenols

: Most plant‐derived polyphenols exhibit strong antioxidant potentials, established by various assay procedures. With pulse radiolysis experiments, absolute scavenging rate constants can be obtained with a variety of oxidizing radicals which allow further structure‐activity correlations and, combine...

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Bibliographic Details
Published in:Annals of the New York Academy of Sciences 2002-05, Vol.957 (1), p.57-69
Main Authors: BORS, WOLF, MICHEL, CHRISTA
Format: Article
Language:English
Subjects:
antioxidants
Antioxidants - chemistry
Antioxidants - pharmacology
flavonoids
Flavonoids - pharmacology
Kinetics
Oxidation-Reduction
Phenols - chemistry
Phenols - pharmacology
Plant Extracts - chemistry
Plant Extracts - pharmacology
Polymers - chemistry
Polymers - pharmacology
polyphenols
resveratrol
Structure-Activity Relationship
Tannins - metabolism
Tannins - pharmacology
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Summary:: Most plant‐derived polyphenols exhibit strong antioxidant potentials, established by various assay procedures. With pulse radiolysis experiments, absolute scavenging rate constants can be obtained with a variety of oxidizing radicals which allow further structure‐activity correlations and, combined with EPR spectroscopy, detailed insight into the mechanisms governing these antioxidant reactions. The most striking difference occurs between regular flavonoids and both condensed and hydrolyzable tannins. The tannins are considered superior antioxidants as their eventual oxidation may lead to oligomerization via phenolic coupling and enlargement of the number of reactive sites, a reaction which has never been observed with the flavonoids themselves.
ISSN:0077-8923
1749-6632
DOI:10.1111/j.1749-6632.2002.tb02905.x