褪黑素脂质体的制备及理化性质研究

目的 制备褪黑素脂质体并考察其理化性质.方法 采用薄膜分散法制备褪黑素脂质体,在单因素考察基础上.采用均匀试验设计优化最佳处方和工艺;透射电镜下观察外观形态,激光散射测定Zeta电势和粒度分布,低温高速离心法分离脂质体与未包封的药物,UV法测定包封率与载药量,膜动态透析法探讨其体外释药特性.结果 均匀试验设计优化的最佳处方为药脂比1:25,磷脂和胆固醇比10:1,温度40℃,最佳处方制备的脂质体为封闭的多层囊状或多层圆球体,大小均匀,平均粒径为(5.542±0.04)μm,Zeta电势为-31.68mV,包封率为(77.23±2.51)%,栽药量为(3.60±0.29)%.体外释放可延长至72h,释放特性符合双相动力学方程(r_α=0.988 6和r_β=0.9874).结论 采用薄膜分散法制备的褪黑素脂质体,包封率较高,体外释药有明显的缓释效果.

Preparation of melatonin liposomes and their physico-chemical properties

Objective To study the preparation of melatonin (MLT) liposomes and their physico-chemical property. Methods Liposomes were prepared by a film dispersion method. Based on a single test,the optimum formulations and the preparation technology were optimized by a uniform experiment. Morphology of the liposomes was detected by transmission electron microscopy. The Zeta potential and particle size distribution were evaluated by laser scattering. High speed centrifugation was applied to separate the free drug and...