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Dextran microgels loaded with ZnO QDs: pH-triggered degradation under acidic conditions

机译:葡聚糖微凝胶加载ZnO QD:酸性条件下的pH-触发降解

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摘要

We demonstrated an extremely facile way to fabricate inorganic-organic microgels with pH sensitivity and fluorescence. Aqueous dextran microgels are crosslinked by ZnO quantum dots (QDs). The ZnO@Dextran microgels were synthesized by simply mixing amino-modified ZnO (ZnO QDs) with carboxymethyl dextran (CMD) while stirring. The hybrid microgels showed an average diameter of approximate to 5 m and strong fluorescence under ultraviolet (365 nm) irradiation. Up to 79.3 wt % of ZnO QDs were loaded into microgels. The ZnO QDs crosslinkage in the hybrid microgels structure enabled the microgels to degrade under mild acidic environment due to pH sensitivity of ZnO QDs. After loading of doxorubicin (Dox), the microgels were used as drug carriers for pH-controlled release of Dox. The degradation of the microgels and the release of loaded cargos could be monitored by detecting fluorescence intensity of the microgels. Moreover, owing to the cytotoxicity of ZnO QDs at their destination, drug-loaded ZnO@Dextran microgels can be used for synergistic therapy. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45831.
机译:我们证实极其容易的方式制造具有pH值敏感性和荧光无机 - 有机微粒凝胶。水性葡聚糖微凝胶的ZnO量子点(QD)交联。在ZnO @葡聚糖微凝胶通过简单地用羧甲基葡聚糖(CMD)混合氨基改性的ZnO(ZnO量子点),同时搅拌合成。的混合微凝胶显示出近似的平均直径为在紫外光下(365纳米)照射在5μm和较强的荧光。 ZnO量子点的高达79.3%(重量)加载到微凝胶。在混合微凝胶结构的ZnO量子点的交联使微凝胶在温和酸性环境下劣化由于ZnO量子点的pH值敏感性。多柔比星的装载(DOX)后,将微凝胶用作药物载体的Dox的pH受控的释放。该微粒凝胶的降解和装载货物的释放可以通过检测微凝胶的荧光强度进行监测。此外,由于ZnO量子点的在其目的地的细胞毒性,药物加载的ZnO @葡聚糖微凝胶可用于协同治疗。 (c)2017 Wiley期刊,Inc.J.Phill。聚合物。 SCI。 2018年,135,45831。

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