灯盏乙素在大鼠体内药代动力学及组织分布的研究

目的：研究灯盏乙素在大鼠体内药代动力学和组织分布特性,为临床合理用药提供科学依据。方法：灌胃给予80 mg·kg^-1的灯盏乙素,HPLC测定大鼠体内灯盏乙素的血药浓度及组织中的浓度,血浆样品用固相萃取的方法处理,其他生物样品用液-液萃取法处理。结果：灯盏乙素在血浆和组织匀浆中线性范围分别为10～1 280 ng·mL^-1(R2>0.99)和40～1 280 ng·g^-1 (R²>0.99),最低检测限分别为10 ng·mL^-1和40 ng·g^-1,日内、日间精密度均小于8%。主要药代动力学参数：达峰时间t_max为(7.7±1.0) h,峰浓度C_max为(288.0±75.2) ng·mL^-1,药时曲线下面积AUC0～t为(5.6±1.6) μg·mL^-1·h,MRT0～t为 (17.5±1.4) h。结论：灯盏乙素口服后在体内呈非房室模型,药时曲线有双峰现象。

Pharmacokinetic and tissue distribution study of scutellarin in rats

OBJECTIVE: To investigate the pharmacokinetic and distribution character of scutellarin in plasma and tissues in rats, in order to provide some references for rational drug use in the clinic. METHOD: The solution of scutellarin was administered to rats (80 mg x kg(-1)) by oral gavage. A high performance liquid chromatography method determinated the scutellarin concentration in rat plasma and tissue. The plasma samples were performed by solid phase extraction method. The other biological samples were extracted by ethyl acetate. RESULT: The range of scutellarin in plasma and tissue in rats were 10-1280 ng x mL(-1) (R2 > 0.99), 40-1280 ng x g(-1) (R2 > 0.99), respectively. The lowest detection of scutellarin were 10 ng x mL(-1) and 40 ng x g(-1), the precision were less than 8%. The main pharmacokinetic parameters of scutellarin were as follows: tmax, Cmax, AUC and MRT being (7.7 +/- 0.9) h, (288.0 +/- 75.2) microg x L(-1), (5.6 +/- 1.6) microg x mL(-1) x h(-1), (17.5 +/- 1.4) h(-1), respectively. CONCLUSION: These methods applied the study of pharmacokinetics of scutellarin. After oral the scutellarin in rats, the concentration-time course doesn't obey any compartment model. The concentration-time curve is the double peaks.