目的以芦丁为模型药物,研究其壳聚糖-海藻酸钠漂浮型微囊的脉冲释药性能。方法采用复凝聚法制备壳聚糖-海藻酸钠微囊,通过添加起泡剂将其制成胃内漂浮型微囊,考察微囊的脉冲释药性能,并研究起泡剂用量对释放时滞的影响。结果该微囊具有pH值响应性,体外释放呈现S型脉冲释放特征,随着起泡剂用量的增加,释放时滞可由3h延长为6h。结论芦丁壳聚糖-海藻酸钠漂浮型微囊具有理想的包封率和脉冲释放性能,适用于中药制剂领域。

Objective Using rutin as the model drug to prepare floating alginate-chitosan microcapsule and investigate the feasibility of this pulsatile drug delivery system applied in Chinese materia medica.Methods By means of complex coacervation to prepare alginate-chitosan microcapsule and foaming agent to turn the microcapsule into gastric floating system and to investigate the release profile of the microcapsule in vitro and the influence of gas forming agent to the lag-time of the microcapsule.Results In vitro release,the microcapsule responded to the change of pH value and the release profile showed "S" profile,the lag-time increased from 3 h to 6 h as the quantity of gas forming agent with the dosage of foamer increased.Conclusion Floating alginate-chitosan microcapsule is suitable to be applied in pulsatile drug delivery system of Chinese materia medica with the desirable entrapment efficiency.