Journal
INTERNATIONAL JOURNAL OF TOXICOLOGY
Volume 29, Issue -, Pages 3S-14SPublisher
SAGE PUBLICATIONS INC
DOI: 10.1177/1091581809357082
Keywords
C-14-dihydrocapsiate; capsinoid; pharmacokinetics; metabolites; rats
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Funding
- Ajinomoto Co, Inc, Kawasaki, Kanagawa, Japan
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Pharmacokinetics of a single gavage dose of C-14-labeled dihydrocapsiate (10 mg/kg) were investigated in male rats. Maximal plasma concentration was achieved in 40 minutes and exhibited an apparent half-life of 2.4 hours. Excretion of radioactivity in the urine, feces, and expired air was 78.2%, 19.4%, and 0.5% of the dose, respectively. Highest tissue concentrations were achieved in the kidney, liver, and blood; the data indicate that radioactivity accumulation following daily exposure at a dose of 10 mg/kg body weight is unlikely. Radioactivity in the plasma was associated with metabolites and their conjugates, probably vanillyl alcohol, vanillic acid, glucuronide of vanillyl alcohol, sulphate of vanillyl alcohol, and sulphate of vanillic acid. These results suggest dihydrocapsiate is metabolized by hydrolysis in the gut, or esterase or other enzymes in the blood, and the metabolites were rapidly absorbed and converted to their conjugates in the liver and eliminated by the kidneys into the urine.
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