ABSTRACT
To study pharmacokinetic characteristics of epimedin A, B, C and icariin after intermuscular administration of Chuankezhi injection to rat. The established RRLC-MS/MS method was applied for simultaneous determination of four analytes in rat plasma and calculating their pharmacokinetic parameters. As a result, each analyte showed a good linear relationship in the concentration range of 1-1 000 μg•L⁻¹.The intra-day precise was 96.9%-107.5% with RSD<5.99%, inter-day precise was 92.3%-105.0% with RSD<10.16%. The relative recovery of four analytes was 88.1%-101.1% with RSD<7.9% and their absolute recovery was 72.0%-86.6% with RSD<6.3%. After intermuscular administration of Chuankezhi injection, the plasma concentration of four flavonoid glycosides rapidly arose to peaks at about 10 min, and then quickly declined in rat. Tmax of epimedin A, B, C and icariin was 0.21, 0.19, 0.16 and 0.49 h, respectively, and their mean elimination half-life(t1/2z) was 0.60, 0.62, 0.47 and 0.49 h. The established method was validated to be sensitive, rapid and specific for determination of the four analytes. Serum concentration of 4 species of epimedium flavonoids in Chuankezhi injection was low, and their absorption and elimination seem quickly, displaying similar pharmacokinetic characteristics in this study.
ABSTRACT
OBJECTIVE: To develope a method for determination of four aflatoxins (B1, B2, G1, G2) in fruit traditional Chinese medicines by rapid-resolution liquid chromatography coupled with electrospray ionization triple quadruple tandem mass spectrometry. METHODS: After being extracted with 70% methanol and purified by immunoaffinity columns, the four aflatoxins were separated on a Shim-pack XR-ODS column using gradient elution with the mobile phase of CH3CN-CH3OH-H2O mixtures monitored under MRM mode in ESI positive scan. RESULTS: There was a good linear relationship over the range of 0.102 1-10.21 ng · mL-1 for AFB1, 0.061 2-7.65 ng · mL-1 for AFB2, 0.193-9.65 ng · mL-1 for AFG1, 0.121-7.55 ng · mL-1 for AFG2 (r > 0.999 8), respectively. The average recoveries ranged from 77.0%-102.4%. CONCLUSION: This method provides a simple and feasible way to determine aflatoxins.