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Preparation of glucose-responsive and fluorescent micelles via a combination of RAFT polymerization and chemoenzymatic transesterification for controlled release of insulin

机译:通过RAFT聚合和化学酶促酯交换相结合制备葡萄糖反应性和荧光胶束,以控制胰岛素的释放

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摘要

A glucose-responsive and fluorescent copolymer was prepared via a one-pot method that combines RAFT polymerization and enzymatic transesterification. The as-prepared copolymer tended to self-assemble into spherical micelles that were confirmed using H-1 NMR, FT-IR and GPC, and transmission electron microscopy (TEM) and dynamic light scattering (DLS) analysis. Due to the attachment of fluorescent side groups, the optical properties of the micelles were analyzed using a UV-Vis spectrometer, fluorescence spectrophotometer and confocal laser scanning microscopy (CLSM). Owing to the amphiphilic and glucose-responsive properties, the micelles could be used as carriers for loaded insulin. The insulin release behaviour was evaluated when triggered by glucose in vitro. In addition, the resultant micelles exhibited relatively lower cytotoxicity and excellent stability against a protein solution. The insulin retained its structure stability after release, investigated through circular dichroism (CD) spectra analysis. These results showed that the obtained glucose-responsive and fluorescent polymer micelles with a good biological imaging performance and biocompatibility could be one of the effective candidate carriers for controllable release of insulin.
机译:通过将RAFT聚合和酶促酯交换反应结合在一起的一锅法制备葡萄糖反应性和荧光共聚物。所制备的共聚物倾向于自组装成球形胶束,使用H-1 NMR,FT-IR和GPC以及透射电子显微镜(TEM)和动态光散射(DLS)分析证实了这种胶束。由于荧光侧基的附着,使用UV-Vis光谱仪,荧光分光光度计和共聚焦激光扫描显微镜(CLSM)分析了胶束的光学性质。由于具有两亲性和葡萄糖反应性,该胶束可用作负载胰岛素的载体。当体外葡萄糖触发时,评估胰岛素释放行为。另外,所得的胶束表现出相对较低的细胞毒性和对蛋白质溶液的优异稳定性。通过圆二色性(CD)光谱分析研究,胰岛素在释放后保持其结构稳定性。这些结果表明,所获得的具有良好的生物成像性能和生物相容性的葡萄糖反应性和荧光聚合物胶束可能是控制胰岛素释放的有效候选载体之一。

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