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Preparation and Properties of UCST‐Type Thermoresponsive Polypeptide Bearing Amide Pendants
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-06-25 , DOI: 10.1002/macp.201900549
Linjie Huang 1 , Liwei Sun 2 , Congping Zhou 1 , Ying Ling 1 , Hua Lu 3 , Shifang Luan 2 , Haoyu Tang 1
Affiliation  

Thermoresponsive polypeptides bearing amide pendants with an upper critical solution temperature (UCST) under physiologically relevant solution conditions are developed. A series of poly(γ‐propanyl‐l‐glutamate)s bearing amide pendants (PPLGn‐Am) with different molecular weight (or degree of polymerization, DP) is prepared by copper mediated 1,3‐dipolar cycloaddition. While fourier transform infra‐red and CD analysis reveal random coil conformation of the PPLGn‐Am in the solid‐state and in aqueous solutions, respectively, PPLGn‐Am shows reversible UCST‐type phase behaviors in deionized water (DI) water and phosphate‐buffered saline. Variable temperature UV–vis spectroscopy indicates that the UCST‐type cloud point temperature (Tcp) in the range of 25–75 °C can be readily tuned by molecular weight (or DP), polymer concentration, and incorporation of hydrophobic (i.e., n‐hexyl) pendants. Moreover, PPLGn‐Am is readily degraded by proteinase K within 48 h. The results indicate that UCST‐type thermoresponsive and biodegradable polypeptides in aqueous solutions can be constructed by conjugation of amide pendants which shall provide guidance for future UCST polymer designs.

中文翻译:

UCST型载有酰胺酰胺的热敏多肽的制备及性质

开发了在生理相关溶液条件下具有最高临界溶液温度(UCST)的带有酰胺侧基的热敏多肽。通过铜介导的1,3-偶极环加成反应制备一系列具有不同分子量(或聚合度,DP)的带有酰胺侧基(PPLG n - Am)的聚(γ-丙炔基-1-谷氨酸)。而傅里叶变换红外和CD分析揭示PPLG的无规卷曲构象Ñ -Am在固态和在水溶液中,分别PPLG Ñ在去离子水中-Am显示可逆UCST型相位行为(DI)水和磷酸盐缓冲溶液。可变温度紫外可见光谱表明UCST型浊点温度(T cp)在25–75°C的范围内可以通过分子量(或DP),聚合物浓度和疏水性(即己基)侧基的结合来轻松调节。此外,PPLG n- Am很容易在48小时内被蛋白酶K降解。结果表明,可以通过酰胺侧基的缀合来构建水溶液中的UCST型热响应性和可生物降解的多肽,这将为将来的UCST聚合物设计提供指导。
更新日期:2020-06-25
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