首页> 外文期刊>RSC Advances >Multifunctional chitosan modified Gd2O3:Yb3+,Er3+@nSiO2@mSiO2 core/shell nanoparticles for pH responsive drug delivery and bioimaging
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Multifunctional chitosan modified Gd2O3:Yb3+,Er3+@nSiO2@mSiO2 core/shell nanoparticles for pH responsive drug delivery and bioimaging

机译:多功能壳聚糖修饰的Gd 2 O 3 :Yb 3 + ,Er 3 + @ n SiO 2 @ m SiO 2 核/壳纳米粒子用于pH响应药物递送和生物成像

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Gd2O3:Yb3+,Er3+@nSiO2@mSiO2 (Gd@mSi) core/shell structure nanospheres were synthesized through a sol–gel method. Then biocompatible polysaccharide chitosan (CS) was grafted onto the surface of the nanoparticles to fabricate a pH responsive CS@Gd@mSi system. Furthermore, cancer targeting ligand folic acid (FA) was modified through the abundant amino groups on the chitosan polymer shell. The nanospheres with a Gd2O3:Yb3+,Er3+ core can be candidates for T1-weighted magnetic resonance imaging (MRI) contrast agents. The CS decorated nanocomposites showing good biocompatibility and red emission under 980 nm laser excitation can be potential candidates for bioimaging in vitro. FA modified nanospheres loaded with doxorubicin hydrochloride (DOX) show higher cytotoxicity for HeLa cells in vitro compared with those nanoparticles with chitosan shells only and pure DOX. The CS@Gd@mSi system can be a potential drug carrier with MRI, UCL, and finely controlled pH-dependent drug release properties.
机译:Gd 2 O 3 :Yb 3 + ,Er 3 + @ n SiO 2 @ m SiO 2 (Gd @ m Si)核/壳结构纳米球。然后将生物相容性多糖壳聚糖(CS)接枝到纳米粒子的表面,以制备pH响应型CS @ Gd @ m Si系统。此外,通过壳聚糖聚合物壳上的大量氨基修饰了靶向癌症的配体叶酸(FA)。具有Gd 2 O 3 :Yb 3 + 的纳米球,Er 3 + 核心可以是 T 1 的候选对象加权磁共振成像(MRI)造影剂。 CS修饰的纳米复合材料在980 nm激光激发下具有良好的生物相容性和红色发射,可能是体外生物成像的潜在候选物。与仅具有壳聚糖壳和纯DOX的纳米粒子相比,负载阿霉素盐酸盐(FAX)的FA修饰的纳米球对体外HeLa细胞的细胞毒性更高。 CS @ Gd @ m Si系统可以成为具有MRI,UCL和精确控制pH依赖性药物释放特性的潜在药物载体。

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