目的制备水飞蓟宾过饱和自乳化给药系统(S-SEDDS), 并对其基本性质进行研究。方法通过溶解度试验、处方配伍试验和伪三元相图的绘制, 以乳化时间、色泽和粒径为指标, 筛选过饱和自微乳的处方组成。采用HPLC法测定水飞蓟宾S-SEDDS中药物;并以水飞蓟宾自乳化给药系统(SEDDS)为对照, 考察药物溶出特征。结果水飞蓟宾S-SEDDS的最佳处方组成为:油相中链甘油三酯(MCT)40%、乳化剂聚氧乙烯氢化蓖麻油(Cremophor RH40)48%、助乳化剂辛酸癸酸聚乙二醇甘油酯(Labrasol)12%, 羟丙甲纤维素(HPMC)的加入量为50 mg/g;水飞蓟宾S-SEDDS的平均粒径为49.6 nm, 自乳化时间<3min, 载药量为39.3 mg/g;体外溶出试验表明处方中加入少量的沉淀抑制剂, 可有效维持药物在S-SEDDS中的过饱和溶解状态。结论所制备的水飞蓟宾过饱和自微乳处方达到了设计要求, 为新制剂开发奠定了基础。

Objective To prepare the supersaturation self-emulsifying drug delivery system(S-SEDDS) containing silymarin and to evaluate its basic properties.Methods With the time of self-emulsifying,the consequence of color visual examination and particle size as parameters,the optimum formulations of silymarin SSEDDS were screened by solubility test,compatibility tests and pseudo ternary phase diagrams.The silymarin concentration was determined by HPLC.The in vitro dissolution characteristics of silymarin S-SEDDS were investigated with silymarin SEDDS as control.Results The optimum silymarin S-SEDDS was composed of medium chain triglycerides(MCT) 40%,Cremophor RH40(ethoxylated hydrogenatedcastor oil) 48%,Labrasol 12%.The time of self-emulsifying was less than 3 min,the average particle diameter was 49.6 nm,the adding amount of hydroxypropyl methylcellulose(HPMC) was 50 mg/g,and the average content of silymarin was 39.3 mg/g.The in vitro dissolution test of silymarin S-SEDDS showed that the presence of a small amount of cellulosic polymer effectively sustained a metastable supersaturated state by retarding precipitation kinetics.Conclusion The designed formulation of silymarin S-SEDDS is reasonable and provides a strong foundation for further development of new preparations.

浙江省新苗人才计划 (2007R40G2120032)