论文摘要
本文制备了可生物降解的魔芋葡甘聚糖(KGM)-聚乙烯醇(PVA)-三聚磷酸钠(STPP)酯化水凝胶。在单因素实验的基础上,用正交试验优化了制备工艺条件;考察了交联剂STPP,共混剂PVA,增塑剂甘油对平衡溶胀度和酶解响应性的影响,利用红外测试、X射线衍射与差示扫描量热(DSC)测试对材料间相互作用与交联机理进行了分析;以牛血清蛋白为模型药物,考察了交联剂、共混剂与增塑剂对药物释放度的影响,探讨了释药机理;建立了释药动力学模型,并进行了方程拟合和参数讨论。主要实验结果如下:(1)确定了制备KGM-PVA-STPP水凝胶的适宜反应条件:KGM的浓度为1%w/w,反应pH为11, n(STPP):n(KGM)=0.6-1,m(NaCl):m(KGM)=1-3%w/w,m(PVA):m(KGM)=0.5-1.5%w/w,甘油为2-6%ml/ml,反应时间为3h,反应温度为室温。(2)红外谱图、X射线衍射与DSC测试结果表明, KGM-PVA-STPP水凝胶中存在较强的氢键相互作用与磷脂键,同时保留了与酶解响应性有关的乙酰基;KGM与PVA通过STPP的架桥作用,产生明显的相互作用;KGM与PVA在交联水凝胶中相容性良好,形成了互穿网络。(3)药物释放结果表明,随着加入的交联剂STPP,共混剂PVA的量的增加,释药速率降低,增塑剂甘油的量的变化对释药速率没有太大的影响。(4)给出了基质型药膜在有酶介质中的释药模式图,建立了基本假设,推导出释药模型如下:溶出介质无酶:二极降解释药模型:溶出介质有酶条件下,二极降解模型的拟合效果相对较好。
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