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Pluronic-based dual-stimuli sensitive polymers capable of thermal gelation and pH-dependent degradation for in situ biomedical application

机译:基于Pluronic的双刺激性聚合物,能够热凝胶化和pH依赖性降解原位生物医学应用

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Thermo-sensitive hydrogels are considered ideal for applications in the biomedical fields for their biocompatibility, flexibility, tissue-like water content, and reversible gelation property. By adjusting sufficient hydrophilic-hydrophobic balance in block copolymer structure, thermogel's critical gelation temperature (CGT) can be modified to be near the physiological temperature, which makes it an appealing candidate for in situ gel depot. In this study, we report successful syntheses of novel multiple block copolymer compounds, denoted as dual-stimuli sensitive polymers (DSSPs), by copolymerizing Pluronic P104 (7100 Da) and 2,2-bis(aminoethoxy)propane (BAP) using diisocyanate linkers, l-lysine ethyl ester diisocyanate (DSSP-1), and 1,6-hexamethylene diisocyanate (DSSP-2). Through effective elongation of polymer chain lengths (DSSP-1: 41,760 Da, DSSP-2: 41,230 Da), Pluronic P104's reversible thermal gelation properties were enhanced, as demonstrated by lowered CGTs (DSSP-1: 36 degrees C, DSSP-2: 38.7 degrees C; 15 wt %) that is near the physiological temperature. Furthermore, integration of acid-labile BAP allowed rapid pH-dependent degradation of the polymer, which was displayed by gel permeation chromatography and release profiles of nile red and irinotecan from polymeric micelles and gels, respectively. (C) 2018 Wiley Periodicals, Inc.
机译:热敏水凝胶被认为是生物医学领域的应用,用于其生物相容性,柔韧性,组织状水含量和可逆凝胶化性能。通过在嵌段共聚物结构中调节足够的亲水 - 疏水平衡,可以修改Thermogel的临界凝胶化温度(CGT),以靠近生理温度,这使其成为原位凝胶仓库的吸引人候选者。在该研究中,我们通过使用二异氰酸酯接头共聚Pluronic P104(7100Da)和2,2-双(氨基乙氧基)丙烷(BAP)来报告成分的新型多嵌段共聚物化合物的成功合成的新型多嵌段共聚物化合物(DSSPS)。 ,L-赖氨酸乙酯二异氰酸酯(DSSP-1)和1,6-六亚甲基二异氰酸酯(DSSP-2)。通过高分子链长度的有效伸长(DSSP-1:41,760Da,DSSP-2:41,230Da),增强了Pluronic P104的可逆热凝胶化性能,如下CGT所示(DSSP-1:36摄氏度,DSSP-2: 38.7摄氏度,15wt%)接近生理温度。此外,酸性不稳定壳体的整合允许通过凝胶渗透色谱和来自聚合物胶束和凝胶的尼罗红和伊替替康的凝胶渗透色谱和释放曲线显示的聚合物的快速pH依赖性降解。 (c)2018 Wiley期刊,Inc。

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