目的制备盐酸青藤碱缓释微丸,并对其体外释药情况进行研究。方法采用离心造粒技术制备微晶纤维素空白丸核和盐酸青藤碱含药丸芯,以聚丙烯酸树脂Eudragit NE 30D为包衣液制成膜控缓释微丸,考察包衣增重、抗粘剂用量等因素对缓释微丸释放...目的制备盐酸青藤碱缓释微丸,并对其体外释药情况进行研究。方法采用离心造粒技术制备微晶纤维素空白丸核和盐酸青藤碱含药丸芯,以聚丙烯酸树脂Eudragit NE 30D为包衣液制成膜控缓释微丸,考察包衣增重、抗粘剂用量等因素对缓释微丸释放度的影响。结果通过单因素考察确定了包衣液处方,所制备的微丸具有明显的缓释特征,体外释药过程符合一级动力学模型。结论用聚丙烯酸树脂Eudragit NE30D作为包衣材料所得缓释微丸符合24 h缓释要求。展开更多
The objective of this study was to prepare tamsulosin hydrochloride-sustained release(TSH-SR)pellets which showed good release stability with frame-controlled method.TSH was added to Eudragit~?NE30D and Eudragit~?L30D...The objective of this study was to prepare tamsulosin hydrochloride-sustained release(TSH-SR)pellets which showed good release stability with frame-controlled method.TSH was added to Eudragit~?NE30D and Eudragit~?L30D-55 polymers to form drug-loaded inner core.Afterwards,enteric Eudragit~?L30D-55 polymer was modified on the surface of it to the final product.Dissolution studies showed that TSH-SR pellets were more stable during the coating process,different curing temperatures and storage conditions compared with TSH pellets produced by film-controlled technique.Appearances and glass transition temperatures(Tgs)of free films and surface morphologies observed by scanning electron microscopy(SEM)of blank sustained release pellets prepared by different ratios of Eudragit~?NE30D and Eudragit~?L30D-55 further indicated that temperature and relative humidity(RH)were the key factors when Eudragit~?NE30D blended with Eudragit~?L30D-55 were applied to sustained/controlled release preparations.In addition,SEM identified the surface morphologies of TSH-SR pellets before and after dissolution,which showed intact surface structure and great correlation with release curve respectively.展开更多
文摘目的制备盐酸青藤碱缓释微丸,并对其体外释药情况进行研究。方法采用离心造粒技术制备微晶纤维素空白丸核和盐酸青藤碱含药丸芯,以聚丙烯酸树脂Eudragit NE 30D为包衣液制成膜控缓释微丸,考察包衣增重、抗粘剂用量等因素对缓释微丸释放度的影响。结果通过单因素考察确定了包衣液处方,所制备的微丸具有明显的缓释特征,体外释药过程符合一级动力学模型。结论用聚丙烯酸树脂Eudragit NE30D作为包衣材料所得缓释微丸符合24 h缓释要求。
文摘The objective of this study was to prepare tamsulosin hydrochloride-sustained release(TSH-SR)pellets which showed good release stability with frame-controlled method.TSH was added to Eudragit~?NE30D and Eudragit~?L30D-55 polymers to form drug-loaded inner core.Afterwards,enteric Eudragit~?L30D-55 polymer was modified on the surface of it to the final product.Dissolution studies showed that TSH-SR pellets were more stable during the coating process,different curing temperatures and storage conditions compared with TSH pellets produced by film-controlled technique.Appearances and glass transition temperatures(Tgs)of free films and surface morphologies observed by scanning electron microscopy(SEM)of blank sustained release pellets prepared by different ratios of Eudragit~?NE30D and Eudragit~?L30D-55 further indicated that temperature and relative humidity(RH)were the key factors when Eudragit~?NE30D blended with Eudragit~?L30D-55 were applied to sustained/controlled release preparations.In addition,SEM identified the surface morphologies of TSH-SR pellets before and after dissolution,which showed intact surface structure and great correlation with release curve respectively.