Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
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Comparison of (−)-Epigallocatechin-3-O-gallate (EGCG) and O-Methyl EGCG Bioavailability in Rats
Yukihiro Oritani Yuko SetoguchiRyouichi ItoHiroko Maruki-UchidaTakashi IchiyanagiTatsuhiko Ito
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2013 Volume 36 Issue 10 Pages 1577-1582

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Abstract

(−)-Epigallocatechin-3-O-(3-O-methyl)gallate (EGCG3″Me) and (−)-epigallocatechin-3-O-(4-O-methyl)gallate (EGCG4″Me) are O-methyl derivatives of (−)-epigallocatechin-3-O-gallate (EGCG) present in tea cultivars such as Benifuuki. Although O-methyl EGCGs have various bioactivities, their bioavailabilities have not been determined. In this study, we compared the bioavailability of EGCG and O-methyl EGCGs in rats, and clarified the pharmacokinetics of O-methyl EGCGs. Following oral administration (100 mg/kg), the areas under the concentration–time curves (AUCs) for EGCG, EGCG3″Me, and EGCG4″Me were 39.6±14.2 µg·h/L, 317.2±43.7 µg·h/L, and 51.9±11.0 µg·h/L, respectively. The AUC after intravenous administration (10 mg/kg) was 2772±480 µg·h/L for EGCG, 8209±549 µg·h/L for EGCG3″Me, and 2465±262 µg·h/L for EGCG4″Me. The bioavailability of EGCG3″Me (0.38%) was the highest (EGCG: 0.14% and EGCG4″Me: 0.21%). The distribution volume of EGCG3″Me (0.26±0.02 L/kg) was the lowest (EGCG: 0.94±0.16 L/kg and EGCG4″Me: 0.93±0.14 L/kg). These results suggested that the higher AUC of EGCG3″Me after oral administration was related to its high bioavailability and low distribution volume. These findings supported the stronger bioactivity of EGCG3″Me in vivo.

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© 2013 The Pharmaceutical Society of Japan
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