Antioxidative Properties of Functional Polyphenols and Their Metabolites Assessed by an ORAC Assay

Hidekazu ISHIMOTO; Akihiro TAI; Morio YOSHIMURA; Yoshiaki AMAKURA; Takashi YOSHIDA; Tsutomu HATANO; Hideyuki ITO

doi:10.1271/bbb.110717

Food & Nutrition Science Notes

Antioxidative Properties of Functional Polyphenols and Their Metabolites Assessed by an ORAC Assay

Hidekazu ISHIMOTO, Akihiro TAI, Morio YOSHIMURA, Yoshiaki AMAKURA, Takashi YOSHIDA, Tsutomu HATANO, Hideyuki ITO

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Keywords: polyphenol, metabolite, antioxidative activity, oxygen radical absorbance capacity (ORAC), AAPH

JOURNAL FREE ACCESS

2012 Volume 76 Issue 2 Pages 395-399

DOI https://doi.org/10.1271/bbb.110717

View "Advance Publication" version (February 7, 2012).

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Abstract

We compared the antioxidative activities of polyphenol metabolites with those of intact functional polyphenols by an assay of the oxygen radical absorbance capacity (ORAC). The metabolites of ellagitannin geraniin, chlorogenic acid, and (−)-epigallocatechin gallate displayed more potent antioxidative activity than their respective original compounds. Our findings suggest that these metabolites may play important roles as biological antioxidants after their consumption.

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