Résumé
<p><b>AIM</b>To develop a sensitive and rapid HPLC method for the determination of tanshinone IIA (TS) in rat plasma and to study its pharmacokinetics in rats.</p><p><b>METHODS</b>TS and 4-chlorodiphenyl (internal standard) were extracted from plasma with ethyl acetate. After liquid-liquid extraction, the sample was analyzed by HPLC with YMC C18 column (5 microns, 150 mm x 3.0 mm ID). The mobile phase consisted of acetontrile-water-acetic acid (74:26:1) at the flow rate of 0.3 mL.min-1, the UV detection wave length was 270 nm.</p><p><b>RESULTS</b>The calibration curve was linear (r = 0.9981) in the range from 0.05 to 6.40 mg.L-1. The lowest detectable concentration was 0.05 mg.L-1. The recoveries at the concentration of 0.05, 1.60 and 6.40 mg.L-1 were 98.9%, 102.1% and 100.4%, respectively. The inter- and intra-day RSDs were all less than 5%.</p><p><b>CONCLUSION</b>This method is proved to be rapid, precise and reliable enough to be applied to the pharmacokinetics studies of TS in rats after a single dose of 15 mg.kg-1 by oral administration.</p>