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Biomimetic Synthesis of Ag2Se Quantum Dots with Enhanced Photothermal Properties and as “Gatekeepers” to Cap Mesoporous Silica Nanoparticles for Chemo–Photothermal Therapy
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2018-12-06 , DOI: 10.1002/asia.201801388
Xianglong Li 1 , Zexiu Liu 1 , Kai Luo 1 , Xiuhui Yin 1 , Xucong Lin 1 , Chunling Zhu 1
Affiliation  

Ag2Se quantum dots (QDs) with near‐infrared (NIR) fluorescence have been widely utilized in NIR fluorescence imaging in vivo because of their narrow bulk band gap and excellent biocompatibility. However, most of synthesis methods for Ag2Se QDs are expensive and the reactants are toxic. Herein, a new protein‐templated biomimetic synthesis approach is proposed for the preparation of Ag2Se QDs by employing bovine serum albumin (BSA) as a template and dispersant. The BSA‐templated Ag2Se QDs (Ag2Se@BSA QDs) showed NIR fluorescence with high fluorescence quantum yield (≈21.2 %), excellent biocompatibility and good dispersibility in different media. Moreover, the obtained Ag2Se@BSA QDs exhibited remarkable photothermal conversion (≈27.8 %), which could be used in photothermal therapy. As a model application in biomedicine, the Ag2Se@BSA QDs were used as “gatekeepers” to cap mesoporous silica nanoparticles (MSNs) by means of electrostatic interaction. By taking the advantages of NIR fluorescence and photothermal property of Ag2Se@BSA QDs, the obtained MSN‐DOX‐Ag2Se nanoparticles (MDA NPs) were employed as a nanoplatform for combined chemo‐photothermal therapy. Compared with free DOX and MDA NPs without NIR laser, the laser‐treated MDA NPs exhibited lower cell viability in vitro, implying that Ag2Se@BSA QDs are highly promising photothermal agents and the MDA NPs are potential carriers for chemo–photothermal therapy.

中文翻译:

仿生合成具有增强的光热特性的Ag2Se量子点,并作为“门卫”封盖介孔二氧化硅纳米颗粒用于化学光热疗法

具有近红外(NIR)荧光的Ag 2 Se量子点(QD)由于其窄的能带隙和出色的生物相容性而被广泛用于体内NIR荧光成像。然而,大多数用于Ag 2 Se QD的合成方法昂贵且反应物有毒。本文提出了一种新的以蛋白质为模板的仿生合成方法,该方法以牛血清白蛋白(BSA)为模板和分散剂来制备Ag 2 Se量子点。以BSA为模板的Ag 2 Se QDs(Ag 2 Se @ BSA QDs)具有近红外荧光,具有高的荧光量子产率(≈21.2%),出色的生物相容性和在不同介质中的良好分散性。另外,得到的Ag 2Se @ BSA量子点表现出显着的光热转化率(约27.8%),可用于光热疗法。作为在生物医学中的模型应用,Ag 2 Se @ BSA QD被用作“门将”,通过静电相互作用封盖介孔二氧化硅纳米颗粒(MSN)。利用Ag 2 Se @ BSA QDs的近红外荧光和光热性能的优势,将获得的MSN‐DOX‐Ag 2 Se纳米颗粒(MDA NPs)用作用于化学光热联合治疗的纳米平台。与未使用NIR激光的自由DOX和MDA NP相比,经激光处理的MDA NP在体外具有较低的细胞活力,这表明Ag 2Se @ BSA QD是非常有前途的光热剂,而MDA NP是化学光热疗法的潜在载体。
更新日期:2018-12-06
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