Metabolism of Paeonol in Rats

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Abstract
As a part of our studies on the metabolism of active components from traditional Chinese medicines, paeonol was orally administered to rats. The urinary metabolites were analyzed by 3D HPLC, and their structures were determined to be 2,4-dihydroxyacetophenone-5-O-sulfate (P1), resacetophenone-2-O-sulfate (P2), 2-hydroxy-4-methoxyacetophenone-5-O-sulfate (P3), paeonol-2-O-sulfate(P4), resacetophenone (P5), and unchanged paeonol, on the basis of their chemical and spectral data. Among these metabolites, P2−P4 and paeonol were detected in the plasma after the oral administration of paeonol. Furthermore, the bile of rats given paeonol orally was found to contain P3, suggesting the enterohepatic circulation of paeonol.

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