A series of random copolypeptides of poly（methoxy-diethylene glycol–L-glutamate）-co-poly（S-（onitrobenzyl）-L-cysteine）was synthesized by ring-open copolymerization of methoxydiethylene glycol-Lglutamate-N-carbox...A series of random copolypeptides of poly（methoxy-diethylene glycol–L-glutamate）-co-poly（S-（onitrobenzyl）-L-cysteine）was synthesized by ring-open copolymerization of methoxydiethylene glycol-Lglutamate-N-carboxyanhydride（EG2-Glu-NCA） and S-（o-nitrobenzyl）-L-cysteine-N-carboxyanhydride（NBC-NCA） in dried dimethylformamide solution, which presents quadruple thermo-photo-redox responsive self-assembly behavior and forms the related nanogel and hydrogel in water.展开更多
Polypeptides and polypeptoids were widely used as biomedical materials because of their good biocompatibility. In this work we reported a series of pH-responsive copolypeptides and polypeptide-polypeptoid block copoly...Polypeptides and polypeptoids were widely used as biomedical materials because of their good biocompatibility. In this work we reported a series of pH-responsive copolypeptides and polypeptide-polypeptoid block copolymers, i.e. random copolymers of L-glutamic acid （Glu） with L-leucine （Leu） [poly（Glu-r-Leu）s], as well as their block copolymers with polysarcosine （polySar）. Well-defined poly（Glu-r-Leu）s with predictable compositions and molecular weights were synthesized by ring opening polymerization of corresponding N-carboxyanhydride monomers. We investigated the relationship between hydrophilicity-hydrophobicity transition and copolymer composition. With increasing Leu fraction, both the pH value of cloud point and the micellar size increased. Poly（Glu-r-Leu） with 60% Leu exhibited a cloud point at the pH of 5.0 to 6.0 the same as that in endosome and lysosome. Poly（Glu-r-Leu）-b-polySars assembled in phosphate buffer and performed pH-responsive morphology change from orbicular micelles at high pH to worm-like micelles at low pH. They were potential pH-responsive carriers for drug and gene delivery to enhance cargo release in cellules.展开更多
基金the financial support of the National Natural Science Foundation of China (No. 21474061)
文摘A series of random copolypeptides of poly（methoxy-diethylene glycol–L-glutamate）-co-poly（S-（onitrobenzyl）-L-cysteine）was synthesized by ring-open copolymerization of methoxydiethylene glycol-Lglutamate-N-carboxyanhydride（EG2-Glu-NCA） and S-（o-nitrobenzyl）-L-cysteine-N-carboxyanhydride（NBC-NCA） in dried dimethylformamide solution, which presents quadruple thermo-photo-redox responsive self-assembly behavior and forms the related nanogel and hydrogel in water.
基金financially supported by the National Natural Science Foundation of China(Nos.21174122 and 51390481)
文摘Polypeptides and polypeptoids were widely used as biomedical materials because of their good biocompatibility. In this work we reported a series of pH-responsive copolypeptides and polypeptide-polypeptoid block copolymers, i.e. random copolymers of L-glutamic acid （Glu） with L-leucine （Leu） [poly（Glu-r-Leu）s], as well as their block copolymers with polysarcosine （polySar）. Well-defined poly（Glu-r-Leu）s with predictable compositions and molecular weights were synthesized by ring opening polymerization of corresponding N-carboxyanhydride monomers. We investigated the relationship between hydrophilicity-hydrophobicity transition and copolymer composition. With increasing Leu fraction, both the pH value of cloud point and the micellar size increased. Poly（Glu-r-Leu） with 60% Leu exhibited a cloud point at the pH of 5.0 to 6.0 the same as that in endosome and lysosome. Poly（Glu-r-Leu）-b-polySars assembled in phosphate buffer and performed pH-responsive morphology change from orbicular micelles at high pH to worm-like micelles at low pH. They were potential pH-responsive carriers for drug and gene delivery to enhance cargo release in cellules.
