pH梯度法制备抗癌复方硫酸长春新碱脂质体

目的：制备同时包结硫酸长春新碱(VCR)、盐酸米托蒽醌(MTO)的复方脂质体并考察其制剂学性质。方法：采用pH梯度法合并逆相蒸发制备同时包结VCR、MTO的复方脂质体；用Sephadex G-50葡聚糖凝胶柱分离,HPLC同时测定VCR和MTO的包封率；以激光散射粒径分析仪测定复方脂质体的平均粒径及Z-电位；透射电镜观测形态；体外释放实验考察复方脂质体的释药特性。结果：所制备复方脂质体VCR的包封率为95.77%,MTO的包封率达99.53%；平均粒径为72.22 nm,Z-电位为-30.97 mV；外观圆整而均匀；体外释放结果复方脂质体中VCR的T_1/2为6.82 h,对照溶液中VCR的T_1/2为1.70 h,MTO在288 h仅释放了0.05%,对照溶液中MTO在12 h释放完全。结论：采用pH梯度法结合逆相法可制得同时包结VCR和MTO的复方脂质体,且包封率高、粒径小,体外释放证实复方脂质体具有缓释特性。

Preparation of liposome entrapped vincristine sulfate and mitoxantrone chlorhydric acid

Objective: To investigate the prepation of the liposome carried with vincristine sulfate (VCR) and mitoxantrone chlorhydric acid (MTO) and to evaluate the quality of the liposome. Method: The liposome carried with VCR and MIT was prepared by pH-gradients method and reverse evaporation technique. HPLC was employed to determine VCR and MIT entrapping efficiency of liposomal. Laser particle analyzer was applied to determine the size and zeta potential of the liposomes carried with VCR and MTO. Result: The mean diameter of the liposome carried with MIT and VCR was 72.22 nm, with the entrapping rate of 95.77% for VCR and 99.53% for MTO. The liposome had perfect shape. Conclusion: The liposomes with high entrapping rate and small particle size had been prepared by pH-gradient method and reverse evaporation technique.