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OALib Journal期刊
ISSN: 2333-9721
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巯-炔加成可控修饰的两亲性嵌段共聚肽及其溶液自组装
DOI: 10.11777/j.issn1000-3304.2015.15071, PP. 1223-1230
Keywords: 聚氨基酸,开环聚合,点击化学,自组装
Abstract:
以单甲氧基聚乙二醇伯胺(mPEG-NH2)作为大分子引发剂,引发γ-炔丙基-L-谷氨酸-N-羧基-环内酸酐(NCA)开环聚合的方法,合成了侧链上含有炔基的聚乙二醇-b-聚(γ-炔丙基-L-谷氨酸)两嵌段共聚物(PEG-b-PPLG).进一步通过巯基-炔基加成的"点击"化学方法,对两嵌段共聚物中聚氨基酸PPLG嵌段分别修饰了普通疏水性的饱和烷烃、具有超疏水性质的全氟代烷烃,并利用红外光谱、圆二色光谱、动态光散射和透射电子显微镜等技术,对合成的两嵌段共聚物在水溶液及有机溶剂四氢呋喃(THF)中的自组装性质进行了研究.研究发现两嵌段共聚物修饰前后,聚氨基酸嵌段在水和THF中都能保持一定的α-螺旋的构象,并进一步自组装形成以α-螺旋的聚氨基酸嵌段为内核、PEG嵌段为外壳的纳米聚集结构.
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