α-细辛脑乳液型与溶液型注射剂的体内药动学和分布比较

目的:比较α-细辛脑乳液型(脂肪乳)与溶液型注射剂的体内药动学行为和组织分布情况,为拓展注射剂类型奠定基础。方法:以α-细辛脑市售注射剂(溶液)为对照,尾静脉注射给药,HPLC测定大鼠血浆和小鼠组织中的药物浓度,进行相应数据处理和结果分析。结果:大鼠单剂量静注α-细辛脑脂肪乳和溶液后,其平均血药浓度-时间曲线相似并均符合二室模型,但脂肪乳的组织分布能力强于溶液;小鼠单剂量静注脂肪乳和溶液后,α-细辛脑在小鼠肺中的分布相似,但脂肪乳增加了α-细辛脑在肝、脾中的分布,减少了其在心、肾、脑中的分布。结论:α-细辛脑脂肪乳与溶液静注后的血药浓度相似,但脂肪乳显著改变了α-细辛脑的体内组织分布。

Comparison of kinetic behavior in both plasma and tissue after intravenous administration of α-asarone in lipid emulsion and aqueous solution in rats and mice

OBJECTIVE: To compare the pharmacokinetics and tissue distribution of alpha-asarone in lipid emulsion and aqueous solution for injection and study the feasibility of lipid emulsion of alpha-asarone as the parenteral drug delivery system. METHOD: HPLC was used to determine the drug concentration in rat plasma and mice tissues after intravenous (i.v.) administration of lipid emulsion and aqueous solution of alpha-asarone at a single dose (40 mg x kg(-1)), respectively. RESULT: The plasma concentration-time profiles of lipid emulsion and aqueous solution of alpha-asarone after intravenous administration of them are similar and the drug concentration-time data were fitted to a two-compartment open model. The results of tissues distribution showed that distribution contents of alpha-asarone from lipid emulsion and aqueous solution in vivo are similar in lungs but lipid emulsion increased the uptake in livers and spleens, and decreased the uptake in hearts and kidneys for alpha-asarone. CONCLUSION: The plasma concentration-time profiles of alpha-asarone in lipid emulsion and aqueous solution are similar, but lipid emulsion significantly altered the tissue distribution of alpha-asarone, which may be beneficial to decrease its potential toxicity to heart and kidney.