辣椒碱脂质体的制备及体外透皮研究

目的：制备辣椒碱脂质体及通过体外透皮试验研究其可行性。方法：采用薄膜-超声法制备辣椒碱脂质体,以包封率为指标,在单因素试验基础上采用正交试验法,筛选最优处方。采用改良Franz扩散池进行透皮试验,比较辣椒碱混悬液、辣椒碱脂质体和辣椒碱软膏经大鼠离体皮肤的累积透过量。结果：辣椒碱脂质体的最佳处方：药脂比1∶5,100 mg吐温-80,50 mg维生素E,10 ml二氯甲烷,10 ml外水相PBS及pH 6.5,超声8 min。透皮试验12 h累积透过率：辣椒碱脂质体〉辣椒碱-PBS混悬液〉辣椒碱软膏；辣椒碱脂质体12 h累积透过量最多,且呈现明显的缓释效果。结论：所制备的辣椒碱脂质体包封率高,并具有良好透皮作用和缓释作用,该工艺简便易行。

Preparation and in vitro Transdermal Penetration of Capsaicin Liposomes

Objective：To prepare capsaicin liposomes and study the feasibility by in vitro percutaneous penetration test. Meth-ods：Capsaicin liposomes were prepared by a film-ultrasonic method. The best formula was screened by orthogonal test based on single factor studies with the entrapment efficiency as the index. The improved Franz diffusion cells were used to study the transdermal pene-tration of capsaicin suspensions, capsaicin liposomes and capsaicin ointments, and the cumulative penetration amount through the isola-ted rat skin was compared. Results：The optimal formula of capsaicin liposomes were as follows：the ratio of capsaicin to lipids was 1∶5;the amount of Tween-80 was 100 mg;the amount of vitamin E was 50 mg;10 ml dichloromethane was used as the solvent. The op-timal pH value of the external phase was 6. 5 with the volume of 10 ml. The ultrasonic time was 8 min. The order of 12-hour cumulative penetration amount was capsaicin liposomes〉capsaicin-PBS suspensions〉capsaicin ointments. Capsaicin liposomes had the highest 12-hour cumulative penetration amount and showed obvious sustained-release property. Conclusion：Capsaicin liposomes have high en-trapment efficiency, good percutaneous penetration and sustained-release property, and the preparation technology is simple.