Pharmacokinetic study of salvianolic acid D after oral and intravenous administration in rats.

A sensitive, specific and rapid LC-MS method was developed and validated for the determination of salvianolic acid D (SalD) in rat plasma. This method used a single quadrupole mass spectrometer with an electrospray ionization (ESI) source. A single ion monitoring scanning (SIM) mode was employed. It showed good linearity over the concentration range from 3.3 to 666.7ng/mL for the determination of SalD. The R.S.D.% of intra-day and inter-day precision values were no more than 7.69%, and the accuracy was within 91%−104% at all quality control levels. This LC-MS method was applied to the pharmacokinetic study of SalD in rats. A two-compartmental model analysis was employed. The plasma concentrations at 2min (C2min) were 5756.06±719.61, 11,073.01±1783.46 and 21,077.58±5581.97μg/L for 0.25, 0.5 and 1mg/kg intravenous injection, respectively. The peak plasma concentration (Cmax) was 333.08±61.21μg/L for 4mg/kg oral administration. The area under curve (AUC0−t) was 14,384.379±8443.184, 22,813.369±11,860.823, 46,406.122±27,592.645 and 8201.740±4711.961μg/L·h for intravenous injection (0.25, 0.5 and 1mg/kg) and oral administration (4mg/kg), respectively. The bioavailability of SalD was calculated to be 4.159%±0.517%.