水飞蓟宾脂质体包封率及其水飞蓟宾含量测定

目的 :建立一种一阶导数紫外分光光度法测定水飞蓟宾脂质体包封率及脂质体中水飞蓟宾含量。方法 :水飞蓟宾脂质体溶液经SephadexG₁₀₀柱分离后 ,以水飞蓟宾一阶导数紫外扫描图谱在 277nm和 294nm处出现的特征峰和特征谷的振幅ΔA进行定量。结果 :方法的线性范围为 0.5～30.0mg·L^-1(r=0.9998) ,回收率为10 1.7% ,精密度为 1.8%。采用该法测定药脂比为 0.02～0.06的水飞蓟宾脂质体 ,包封率为 65.1%～83.0% ,脂质体中水飞蓟宾平均含量为 760 .4mg·L^-1(n=4)。结论 :一阶导数分光光度法准确、简便 ,可用于水飞蓟宾脂质体的质量控制。

Determination of Concentration and Encapsulation Efficie ncy of Silybin Liposomes

OBJECTIVE: To determine the encapsulation efficiency of silybin liposomes. METHOD: After Silybin liposomes solution was separated through sphadex G-100 column, eluent collected was determined by the first derivative UV spectrometry. RESULT: The calibration curve of Silybin was linear in the range of 0.5-30.0 mg x L(-1) (r = 0.9998). The average recovery was 101.7%. The relative standard deviation was 1.8%. The results showed that the encapsulation efficiency ranged from 65.1%-83.0% when the drug/phospholipid ratio varied from 0.02-0.06. The concentration of SLB in liposomes prepared by optimum technique was 760.4 mg x L(-1) (n = 4). CONCLUSION: The method is accurate, simple and suitable for the quality control of Silybin liposomes.