Role of Metabolism in Physiological Function of Polyphenol Catechins Seigo BABA Nutritional Science Center, Health and Bioscience Laboratories, Meiji

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2 Role of Metabolism in Physiological Function of Polyphenol Catechins Seigo BABA Nutritional Science Center, Health and Bioscience Laboratories, Meiji Seika Kaisha, Ltd., 5-3-1, Chiyoda, Sakado-shi, Saitama , JAPAN Junji TERAO Food Science Laboratory, Department of Nutrition The University of Tokushima School of Medicine Kuramoto-cho Tokushima , JAPAN Abstract: Polyphenols present in plant foods and beverages have attracted much attention as food factors in the prevention of life style-related diseases and health promotion. Here we presented recent studies on the bioavailability of polyphenols, in particular, the relationship between the absorption/metabolism of catechins and their physiological functions including antioxidative effect. In either rats or humans, both (+)-catechin and (-)-epicatechin were found to be more absorptive than gallate-binding catechins. In plasma, they are present mainly as conjugated metabolites, namely glucuronides, sulfates and their methylated products. Nevertheless, their metabolite profiles are different between rats and humans. For example, considerable amounts of sulfates accumulate in human plasma. Catechin metabolites still possess antioxidative effect as long as catechol structure is unchanged. Alternatively, catechin metabolites were recently reported to suppress the induction of apoptosis in nervous cells. Therefore, biological activity of catechin metabolites should be clarified in detail in order to estimate the physiological function of dietary catechins. Key words : Flavonoids, Catechin, Intestinal Absorption, Antioxidant, Conjugated Metabolite

3 Fig. 1 Structure of Catechins.

4 Fig. 2 Structure of Phenolic Acids. Fig. 3 Proposed Scheme of Possible Metabolic Fate in Rats of Administered (+)-catechin and -epicatechin. C, (+)-catechin or -epicatechin; UGT, UDPglusuronosyl transferase; PST, phenylsulfotransferase; COMT, catechol-o-methyltransferase; GlcA, glucuronide moiety; Sulf, sulfate moiety; Met, methyl moiety; Conj, conjugate moiety; HHA, 3-hydroxyhippuric acid; HBA, 3-hydroxybenzoic acid; HPPA, 3-hydroxyphenylpropionic acid.

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6 Fig. 5 Structures of Plasma Epicatechin Metabolites in Humans. Fig. 4 Structures of Plasma Epicatechin Metabolites in Rats.

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