布洛芬膜控型和骨架型缓释微丸的制备和对比

目的制备布洛芬膜控型和骨架型两种缓释微丸,并对体外释放进行分析,研究两者的释药机理。方法两种缓释微丸均采用离心制丸机粉末层积法上药,流化床底喷包衣进行制备,采用Eudragit RLPO作为骨架材料和Eudragit RLPO与E100作为膜控缓释材料。结果微丸光滑圆整,硬度适中,适合包衣,两种微丸均具有明显缓释效果,释药机制为扩散和溶蚀协同作用。结论膜控型缓释微丸释放优于骨架型缓释微丸,制备工艺稳定可行。

乌头汤膜控型缓释浓缩丸的初步研究

目的:制备乌头汤膜控型缓释浓缩丸。方法:选择衣膜厚度、增塑剂的用量、致孔剂的用量为影响药物释放过程的主要因素,通过均匀设计优选出最佳包衣处方。结果:采用优选的包衣处方制备的缓释浓缩丸符合H iguch i释放过程。结论:乌头汤膜控型缓释浓缩丸的制备有可行性。

离心法制备硝酸异山梨酯缓释微丸包衣处方及工艺优化

采用离心法制备硝酸异山梨酯缓释微丸,以微丸的体外释放度为考察指标,探讨包衣处方、工艺因素对缓释微丸的释药特征的影响。结果表明,以丙烯酸树脂Eudragit RLPO为包衣材料,包衣增重为8%,增塑剂与抗粘剂分别占包衣聚合物量的15%,40%。在体外释放度实验中,微丸中药物累积释放百分率0.5 h为20%,2 h为55%,8 h为84%。该方法制备的硝酸异山梨酯缓释微丸包衣均匀,操作简便,质量稳定可靠,适合工业化生产。

格列吡嗪缓释微丸的制备及体外释放度考察

目的通过体外释放度考察及筛选,制备释药行为理想的膜控型格列吡嗪缓释微丸。方法采用离心造粒技术与粉末层积法制备格列吡嗪载药微丸;以丙烯酸树脂类Eudragit水分散体为包衣材料,采用流化床包衣,制备12h缓释微丸;考察自制缓释微丸的体外释放度,并与骨架型市售缓释胶囊进行比较。结果自制膜控型格列吡嗪缓释微丸释放符合一级动力学模型,骨架型缓释制剂初期突释效应比较明显。结论成功制备了膜控型格列吡嗪缓释微丸,体外释放符合缓释制剂要求。

NE30D作为膜控材料的盐酸氨溴索缓释特征参数的研究

目的以NE30D为膜控材料,考察其对盐酸氨溴索渗透作用的影响,探索制定盐酸氨溴索的缓释特征参数。方法以不同浓度的NE30D制备成膜作为渗透阻滞材料,以三室渗透装置考察NE30D膜厚度、盐酸氨溴索溶液浓度、同一批号膜材料批内和批间多个样本对透过率的影响,并计算阻滞效率。结果同一批号膜材料批内和批间制备的不同样本,通过控制制备参数得到的NE30D膜对盐酸氨溴索的阻滞效率重现性非常好,5%浓度制备的膜的阻滞效率在4.0%~4.6%/h,10%浓度制备的膜的阻滞效率在9.0%~9.4%/h。结论 5%和10%浓度制备的NE30D膜对盐酸氨溴索的阻滞效率影响非常大,表明盐酸氨溴索可以通过改变膜的厚度来实现适当的释放速度,也表明NE30D是比较理想的盐酸氨溴索的缓释膜控材料。提示NE30D对于盐酸氨溴索的膜控缓释特征参数可以采用高、低浓度制备膜的阻滞效率及其差值。

Comparison of Nutrient Release Characteristics from Coated Controlled/Slow-release Fertilizers

[Objective] The study aimed at comparing the characteristics of nutrient release from coated controlled/slow-release fertilizers,so as to provide theoretical reference for improving the farming practice and fertilizer application,reducing pollution in Baiyangdian Lake and the surrounding area.[Method] Soil column leaching method was used to study NH4-N and NO3-N leaching characteristics from five kinds of nitrogen fertilizers including three coated controlled/slow-release fertilizers.[Result] Resin and sulfur coated controlled/slow-release urea decreased NH4-N concentration obviously,controlled NO3-N release in early term of experiment,while increased the content of NH4-N ＋ NO3-N in middle-late periods.Compared with that of common urea,the NH4-N of resin and sulfur coated controlled/slow-release urea decreased by 98.5%,98.7% in early period,96.5%,97.4% in middle period,and 59.1%,81.75% in last period.[Conclusion] Resin and sulfur coated controlled/slow-release urea significantly reduced the NH4-N concentration,effectively controlled the NO3-N release in early stage and increased the supply of NO3-N in last period.

包衣处方和工艺对对乙酰氨基酚缓释微丸释放度的影响

目的研究包衣处方和工艺对离心法制备的膜控型缓释微丸的体外释药行为的影响。方法以对乙酰氨基酚为模型药,采用BZJ-360型离心造粒包衣机以液相层积法制备含药丸芯,以微丸的体外释放度为考察指标,分别用单因素考察和正交试验的方法来探讨包衣处方、工艺因素对缓释微丸的释药特征的影响,并筛选出最佳水平,通过对药物释放度曲线的药动学模型拟合确定微丸的缓释机制。结果以丙烯酸树脂(Eudragit RS PO∶RL PO=10∶1)为包衣材料,包衣增重为10%,聚合物浓度为6%时包衣微丸在pH 6.2的磷酸盐缓冲液中呈现良好的缓释效果,释药机制主要是以膜控为主的扩散作用,骨架溶蚀也起到了一定的协同作用。结论该技术制备的对乙酰氨基酚缓释微丸包衣均匀,操作简便,质量可靠,可工业化生产。