Method for analysis of tannic acid and its metabolites in biological samples: application to tannic acid metabolism in the rat |
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| Authors: | Nakamura Yumiko Tsuji Sumiko Tonogai Yasuhide |
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| Institution: | National Institute of Health Sciences, Osaka Branch, 1-1-43 Hoenzaka, Chuo-ku, Japan. ynakamura@nihs.go.jp |
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| Abstract: | A new analytical method for measuring tannic acid (TA) using tannase was developed and applied to the investigation of TA metabolism in the rat following oral administration at a dose of 1.0 g/kg. The proposed method for TA determination was based on the enzymatic hydrolysis of TA to gallic acid (GA) and subsequent determination by HPLC. TA metabolites were determined by HPLC. 4-O-Methylgallic acid (4-OMGA), pyrogallol (PY), and resorcinol (RE) were detected in serum. TA was excreted into urine as GA (0.01%), 4-OMGA (0.10%), PY (0.24%), and RE (2.06%) and into feces as TA (62.74%), GA (0.19%), PY (0.02%), and RE (0.76%) within 54 h after oral administration. It was suggested that >60% of TA remained unchanged but that some was hydrolyzed to GA by tannase in the intestine and further metabolized to 4-OMGA, PY, and RE. |
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