Behavior of Trp-P-1 and Its Metabolites in Rat Excreta.

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  • ラット排せつ物中でのＴｒｐ‐Ｐ‐１及びその代謝物の挙動
  • ラット排泄物中でのTrp-P-1及びその代謝物の挙動
  • ラット ハイセツブツ チュウ デ ノ Trp P 1 オヨビ ソノ タイシャブツ ノ キョドウ

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Abstract

To study of the behavior of Trp-P-1 and its metabolites in rat feces and urine, rats were orally administered with Trp-P-1 (750, 1,500 and 2,500 μg/rat), and excreted Trp-P-1 was analyzed using HPLC assay and bacterial mutagenicity assay. The extraction of Trp-P-1 from urine was performed by using the chloroform extraction method, and blue rayon was used for the extraction from feces.<br>When Trp-P-1 was added to rat feces and urine, the recoveries of Trp-P-1 were 85.9±3.9% and 91.3±3.7%, respectively. The extracts of feces and urine from rats administered with Trp-P-1 were individually fractionated by thin layer chromatography on C18 gel. The major mutagenic zone corresponding to Trp-P-1 was found at Rf 0.09 in both extracts, while the feces extract gave two additional mutagenic zones at Rf 0.15 and 0.20. More than 97% of the fecal mutagenic activity was due to unchanged Trp-P-1.<br>In rats administered with 750 μg of Trp-P-1, the amount of extracted Trp-P-1 and the number of His+ colonies induced by whole excreta were 81.6±7.1 μg (n=6) and (432±77)×104 for feces, and 28.7±4.9 μg and (171±28)×104 for urine. The recoveries of Trp-P-1 in the feces and urine were 10.8±0.9% and 3.8±0.7% by HPLC analysis, and 11.1±2.0% and 4.4±0.7% by mutagenicity assay respectively. The results of the two assays seemed to show similar patterns of recovery.

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