N-异丙基丙烯酰胺(NIPA)和丙烯酸甲酯(MA)通过自由基共聚形成线型大分子P(NIPA-MA),再用联胺取代MA嵌段上的甲氧基,得到一种多官能团的温敏大分子聚(N-异丙基丙烯酰胺-丙烯酸甲酯-丙烯酰肼)(PNMH),用它交联氧化的海藻酸钠(OSA),得到可生物降解的温敏凝胶PNMH-OSA.研究了PNMH的取代度(DS)、海藻酸钠的氧化程度(DO)、pH值和离子强度对PNMH-OSA凝胶降解性能的影响,同时以次甲基蓝(MB)和牛血清蛋白(BSA)为模拟药物.采用包埋法将药物载入凝胶中,研究了凝胶的释药行为.结果表明,凝胶降解速率随海藻酸钠的氧化程度、pH值增加而增加,随PNMH的取代度、离子强度增加而减慢;药物释放速率与药物的分子量和凝胶的降解速率有关.
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