【摘要】 通过溶胶-凝胶法合成了在水溶液中稳定发光、荧光颜色可调的ZnO@polymer核壳型纳米粒子,并研究了这种量子点对人类宫颈癌HeLa细胞的毒性以及细胞吞噬后激光共聚焦成像的效果.这种荧光探针的外壳是一种通过配位键与ZnO内核结合的共聚物,该共聚物外层是亲水的聚甲基丙烯酰胺,内层是疏水的聚甲基丙烯酸酯.细胞毒性实验证明,该材料有良好的生物兼容性,适用于生物荧光标记.共聚焦荧光成像结果显示,这些纳米粒子可以穿透HeLa细胞膜并在细胞质中稳定发光.更多还原

【Abstract】 ZnO@polymer core-shell nanoparticles with stable luminescence in aqueous solutions and tunable emission were synthesized by sol-gel method,studied in cytotoxicity tests towards HeLa cells and measured by laser confocal scanning microscope.The shell of such luminescent probes is a copolymer connected the ZnO core through coordination bonds,which contains an external hydrophilic layer of polymethacrylamide and an internal hydrophobic layer of polymethacrylate.Such design protected the ZnO cores from decomposition by aqueous solutions on one hand,and assured the highly dispersity and long-term stability in water on the other hand.Cytotoxicity measurements proved this material is biocompatible and suitable for biological labels.The results of the laser confocal imaging showed these nanoparticles could penetrate the membranes of HeLa cells and exhibited stable fluorescence in the cytoplasm.更多还原