摘要
Aim To prepare the prolonged-released microspheres of mefformin hydrochloride. Methods Ion-exchange resin-drug mefformin hydrochloride complexes were prepared as core materials, and followed by coating using ethylcellulose （EC） by the emulsion solvent diffusion technique. The release rate of mefformin from the microcapsules was highly dependent on the encapsulating formulation, thus being used as an index for formulation screening. Orthogonal experiments were performed to optimize the coating formulation. Results The final chosen formulation for coating of mefformin microcapsules were as follows： （ 1 ） the ratio of EC （20cps） to EC （45cps） was 50：50; （2） the ratio of plasticizer to coating materials was 20% ;and （3） the ratio of resin-mefformin complexes to coating materials was 5 ： 1. Conclusion The prolonged release microspheres of mefformin hydrochloride were successfully prepared.
目的制备盐酸二甲双胍缓释微囊。方法以自制的离子交换树脂-药物复合物作为核心材料,乙基纤维素(EC)做为包衣材料,用乳化溶剂扩散法制备了盐酸二甲双胍的缓释微囊。以药物的释放百分率作为单因素考察指标,用正交实验优化包衣处方。结果处方组成为EC(20cps)∶EC(45cps) =50∶50,增塑剂∶包衣材料=1∶5,药物树脂复合物∶包衣材料=5∶1。结论成功制备了具有明显缓释特性的盐酸二甲双胍药物树脂微囊。
