Synthesis and Characterization of Well-Defined PEGylated Polypeptoids as Protein-Resistant Polymers
作者:Sunting Xuan、Sudipta Gupta、Xin Li、Markus Bleuel、Gerald J. Schneider、Donghui Zhang
DOI:10.1021/acs.biomac.6b01824
日期:2017.3.13
Well-defined polypeptoids bearing oligomeric ethylene glycol side chains (PNMe(OEt)nG, n = 1–3) with a controlled molecular weight (3.26–28.6 kg/mol) and narrow molecular weight distribution (polydispersity index, PDI = 1.03–1.10) have been synthesized by ring-opening polymerization of the corresponding N-carboxyanhydrides having oligomeric ethylene glycol side chains (Me(OEt)n-NCA, n = 1–3) using primary amine initiators. Kinetic studies of polymerization revealed a first-order dependence on the monomer concentration, consistent with living polymerization. The obtained PEGylated polypeptoids are highly hydrophilic with good water solubility (>200 mg/mL) and are amorphous, with a glass transition temperature in the −41.1 to +46.4 °C range that increases with increasing molecular weight and decreasing side chain length. DLS and SANS analyses revealed no appreciable adsorption of lysozyme to PNMeOEtG. PNMeOEtG having different molecular weights exhibited minimal cytotoxicity toward HEp2 cells. These combined results suggest the potential use of PEGylated polypeptoids as protein-resistant materials in biomedical and biotechnological fields.
具有寡聚乙二醇侧链 (PNMe(OEt)nG, n = 1–3) 的明确多肽,具有受控分子量 (3.26–28.6 kg/mol) 和窄分子量分布(多分散指数,PDI = 1.03–1.10) )通过具有低聚乙二醇侧链的相应 N-羧酸酐(Me(OEt)n-NCA,n = 1–3) 使用伯胺引发剂。聚合动力学研究揭示了对单体浓度的一阶依赖性,与活性聚合一致。获得的聚乙二醇化多肽具有高度亲水性,具有良好的水溶性(>200 mg/mL),并且是无定形的,玻璃化转变温度在-41.1至+46.4°C范围内,随着分子量的增加和侧链长度的减少而增加。 DLS 和 SANS 分析表明,PNMeOEtG 没有明显吸附溶菌酶。具有不同分子量的PNMeOEtG对HEp2细胞表现出最小的细胞毒性。这些综合结果表明聚乙二醇化多肽作为生物医学和生物技术领域的蛋白质抗性材料的潜在用途。