波谱学杂志 ›› 2007, Vol. 24 ›› Issue (3): 267-273.

• 研究论文 • 上一篇    下一篇

合成聚肽嵌段共聚物PHEG-PBLG结构的核磁共振分析

张静夏;李碧虹;王琴梅;黄爱东   

  1. 中山大学 药学院,广东 广州 510089
  • 收稿日期:2006-08-28 修回日期:2007-03-19 出版日期:2007-09-05 发布日期:2009-12-05
  • 通讯作者: 张静夏

Synthetic Polypeptide Structure of Block Copolymer PHEG-PBLG Analyzed by NMR

ZHANG Jing-xia;LI Bi-hong;WANG Qin-mei;HUANG Ai-dong1   

  1. School of Pharmaceutical Sciences, Sun Yat-sen University, 510089, China
  • Received:2006-08-28 Revised:2007-03-19 Online:2007-09-05 Published:2009-12-05
  • Contact: Zhang Jing-xia

摘要: 通过L-谷氨酸苄酯和三光气反应制备谷氨酸苄酯的N-羧酸酐,以聚羟乙谷氨酸酰胺为大分子引发剂,投入不同配比的单体/引发剂(A/I),共聚得到两亲性嵌段共聚物聚羟乙谷氨酰胺-聚谷氨酸苄酯(PHEG-PBLG);通过核磁共振技术分析表征该合成聚肽的结构组成、分子量范围及螺旋结构;通过体外酶解实验研究了共聚物的降解情况. 研究结果表明:该合成聚肽化合物为两亲性嵌段聚合物:当聚合物中亲水链段PHEG分子量为9000,A/I为75∶1, 100∶1, 150∶1, 200∶1时,相应的共聚物的分子量分别为:1.27×104,1.75×104, 1.9×104, 3.60×104;该合成聚肽含有α-螺旋结构, 随着TFA的加入,该聚肽的结构由α-旋构象转化为随机盘绕构象.

关键词: 核磁共振, 生物材料, 合成聚肽, 聚羟乙谷氨酰胺-聚谷氨酸(PHEG-PBLG)

Abstract: Initiated by poly(hydroxylethyl glutamine), amphiphilic block copolymer of poly(hydroxylethyl glutamine (PHEG)) and poly(γ-benzyl-L-glutamate (PBLG)) was synthesized by polymerization of N-carboxyl anhydride (NCA). NCA monomer was synthesized by reacting γ-benzyl-L-glutamate with triphosgene. The constitution, molecular weight and α-helical structures of the resulting block copolymers were studied by NMR and enzymolysis of the black polymers in vitro was discussed. The results showed that the copolymers with different block-ratio of PHEG/PBLG had different molecular weights, being 1.27×104, 1.75×104, 1.9×104 and 3.60×104 when the A/I ratios were 75∶1, 100∶1, 150∶1 and 200∶1, respectively. The copolymers contained α-helix structures in CHCl3, which could be converted into random coils with addition of TFA.

Key words: biomaterials, synthetic polypeptide, NMR, poly (hydroxylethyl glutamine) and poly-(γ-benzyl-L-glutamate)