[关键词]
[摘要]
目的 制备黄芪甲苷自乳化释药系统(SMEDDS),并考察其大鼠在体肠吸收特性。方法 根据黄芪甲苷在不同油相、乳化剂和助乳化剂中的溶解度以及配伍实验结果,确定了黄芪甲苷SMEDDS的处方组成,并通过伪三元相图法绘制出能够形成理想微乳液区域各组成成分的用量范围;评价黄芪甲苷SMEDDS经水分散后形成微乳的微观结构、粒径分布以及体外药物释放情况;考察黄芪甲苷SMEDDS经模拟人体生理体液稀释后的稳定性;通过大鼠在体小肠灌流实验考察黄芪甲苷自微乳液在大鼠肠吸收动力学特征。结果 黄芪甲苷SMEDDS处方由Capmul MCM、聚山梨酯80、Transcutol H构成;在形成微乳区域内任选择一点处方用量制备黄芪甲苷SMEDDS,经水分散后形成淡蓝色乳光微乳液,在透射电镜下可观察到微乳大小均匀,呈圆球状分布,平均粒径为(45.4±5.8)nm;黄芪甲苷SMEDDS在3种溶出介质中药物溶出速率均显著提高;其形成的微乳液在模拟人体生理液体中物理稳定性良好。黄芪甲苷SMEDDS在大鼠整个肠的吸收速率显著高于原料药混悬液。结论 将黄芪甲苷制备成SMEDDS可提高药物溶出速率,增强肠道对药物吸收程度,有望改善黄芪甲苷口服生物利用度。
[Key word]
[Abstract]
Objective To prepare astragaloside IV self-emulsifying drug release system (astragaloside IV SMEDDS), and investigate its intestinal absorption characteristics in rats. Methods According to the solubility and compatibility of astragaloside IV in different oil phases, surfactants and cosurfactants, the prescription composition of astragaloside IV SMEDDS was determined. The dosage range of each component in the ideal microemulsion region was drawn by pseudo-ternary phase diagram, and the microstructure, particle size distribution and in vitro drug release of astragaloside IV SMEDDS after water dispersion were evaluated. The stability of astragaloside IV SMEDDS diluted with simulated human physiological body fluid was investigated, and the intestinal absorption kinetics of astragaloside IV self-microemulsion in rats was investigated by intestinal reflux test in rats. Results The prescription of astragaloside IV SMEDDS was composed of Capmul MCM, Tween-80, and Transcutol H. Astragaloside IV SMEDDS was prepared by water dispersion to form a light blue emulsion microemulsion, and the uniform size of the microemulsion could be observed under transmission electron microscope, and the microemulsion was prepared by selecting a certain amount of astragaloside IV in any prescription dosage in the microemulsion formation region. The light blue emulsion microemulsion could be observed under transmission electron microscope. The average particle size of astragaloside IV SMEDDS was (45.4 ±5.8) nm; The dissolution rate of astragaloside IV in the three dissolution media was significantly increased, and the microemulsion formed by astragaloside IV had good physical stability in simulated human physiological liquid. The absorption rate of astragaloside IV microemulsion in the whole intestine of rats was significantly higher than that of astragaloside IV suspension. Conclusion The preparation of astragaloside IV into SMEDDS can increase the dissolution rate of the drug, enhance the absorption of the drug in the intestinal tract, which is expected to improve the oral bioavailability of astragaloside IV.
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[基金项目]
陕西省中药制药重点学科资助项目(1008);陕西省创新人才推进计划-科技创新团队(2018TD005);陕西省教育厅项目(18JS026)