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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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pH响应性超支化星形共聚物的合成及基因转染研究
DOI: 10.11777/j.issn1000-3304.2015.14165, PP. 15-24
Keywords: ATRP,超支化星形共聚物,pH响应性,基因转染
Abstract:
通过两步ATRP制备了两亲性pH响应性超支化星形共聚物HP(DMAESP-co-BS2MOE)-(POEGMA)n.首先,以2-(2'-溴异丙酰氧基)乙基2"-甲基丙烯酰氧基乙基二硫化物(BS2MOE)为自引发单体,与甲基丙烯酰氧基-3-硫代己酸二甲氨基乙酯(DMAESP)共聚,得到超支化共聚物HP(DMAESP-co-BS2MOE).然后以HP(DMAESP-co-BS2MOE)作为大分子引发剂引发甲基丙烯酸寡聚乙二醇酯(OEGMA)的聚合,得到超支化星形共聚物HP(DMAESP-co-BS2MOE)(POEGMA)n.在DMAESP中,叔胺基团和甲基丙烯酸酯基团通过酸敏感的β-硫丙酯键连接,由于该键在酸性条件下能够缓慢水解,形成羧基末端,最终得到的聚合物具有pH响应性.同时,由于BS2MOE中含有二硫键,能够被细胞中的谷胱甘肽还原,该聚合物同时具有氧化还原响应性.HP(DMAESP-co-BS2MOE)(POEGMA)n在水中能够自组装成以HP(DMAESP-co-BS2MOE)为核,以POEGMA为壳的纳米级胶束,并能负载DNA,可作为基因转染的载体.
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