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Determination of Norathyriol in Rat Plasma and Its Pharmacokinetics Study

??OBJECTIVE To establish a method for the determination of norathyriol in rat plasma by HPLC and to study its characteristics of pharmacokinetics. METHODS Ethyl formic acid(10:1)was used to precipitate protein in the plasma samples after the addition of internal standard, and then the concentration was analyzed by HPLC. All of the separations were carried out on a Platisil ODS(4.6 mm??250 mm,5 ??m) at room temperature. The mobile phase was consisted of formic acid(40:60:0.5, pH 2.74), and was pumped at flow rate of 0.8 mL??min^-1. The UV detection wavelength was set at 312 nm. The rats were given norathriol by intragastric administration with a dosage of 400 mg??kg^-1. The concentration of norathriol in plasma at different time points was determined. RESULTS A good linear relationship was obtained in the concentration range of 0.54-162 ??g??mL^-1(r=0.998). The intra-day and inter-day RSD were less than 7.5% . The main pharmacokinetic parameters measured by Winnonlin 6.1 were showed as follows:t_max,t_1/2, ??_max and AUC_0-t were 0.5 h,(3.46??0.903) h,(26.9??3.17)??g??mL^-1,(52.4??12.0) ??g??h??mL^-1, respectively. CONCLUSION The HPLC method established is rapid and specific, and can be successfully applied in basic pharmacokinetic study in rat plasma.