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Comparative pharmacokinetic profiles of glycyrrhetic acid (GA), glycyrrhizic acid (GL) and Gancao-Fuzi-Tang (KF) after oral administration of GL and KF were studied. Plasma samples taken from rats were acidified with acetic acid and GA was extracted with isopropanol-ethyl ether (1 : 1). Separation of GA was performed on a C(18) column with the detection wavelength set at 254 nm. The mobile phase was methanol-acetonitrile-water-acetic acid (58 : 18 : 24 : 1 v/v). The results showed that the mean residence time and area under the curve of GA in KF-administered rats were 27.6+/-1.5 h and 122.8+/-46.7 microg.h/ml respectively, which were significantly different from those in GL-administered rats (15.0+/-2.0 h and 40.9+/-9.6 microg.h/ml, respectively). The results suggest the increased effect of GA after oral administration of KF in comparison with GL.

Comparative Pharmacokinetic Behavior of Glycyrrhetic Acid after Oral Administration of Glycyrrhizic Acid and Gancao-Fuzi-Tang