文章基本信息

标题：Pharmacokinetics of (−)-Epicatechin-3-O-gallate, an Active Component of Onpi-to, in Rats
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作者：Yukiho Takizawa ; Takashi Morota ; Shuichi Takeda 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2003
卷号：26
期号：5
页码：608-612
DOI：10.1248/bpb.26.608
出版社：The Pharmaceutical Society of Japan
摘要：(−)-Epicatechin-3- O -gallate (ECG), a component of Rhei Rhizoma, is one of the active components of Onpi-to, a herbal medicine composed of five crude drugs (Rhei Rhizome, Glycyrrhizae Radix, Ginseng Radix, Zingiberis Rhizoma and Aconiti Tuber), which has been used in patients with chronic renal failure. Pharmacokinetics of ECG was investigated in male rats employing an HPLC-electrochemical detection method. 1. Following oral administration of ECG, ECG plasma levels revealed curves characterized by peaks at 0.065, 0.063 and 0.085 h corresponding to dosages of 12.5, 25.0 and 50.0 mg/kg at mean concentrations of 49.62, 212.89 and 464.04 ng/ml, respectively. Plasma levels subsequently declined bi-exponentially. ECG demonstrated nonlinear pharmacokinetics in terms of C _max and AUC (0—inf). 2. The absolute bioavailability values ( F ) were 1.02, 1.47 and 3.30% at doses of 12.5, 25.0, and 50.0 mg/kg, respectively. 3. Following intravenous injection of ECG, plasma levels of ECG decreased with the γ-elimination half-life ( t _1/2γ) of 4.03 h. 4. Following oral administration of ECG, urinary levels of ECG were lower than the quantitation limit. Moreover, cumulative excretion of the metabolites, δ-(3,4-dihydroxyphenyl)-γ-valerolactone and δ-(3-methoxy-4-hydroxyphenyl)-γ-valerolactone, was 2.45 and 0.23% of dose, respectively, up to 30 h after dosing.
关键词：(−)-epicatechin-3-O-gallate (ECG);pharmacokinetic;rat;HPLC-electrochemical detection (ECD);plasma;urine