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首页> 外文期刊>Journal of nanoparticle research: An interdisciplinary forum for nanoscale science and technology >An investigation into the role of macromolecules of different polarity as passivating agent on the physical, chemical and structural properties of fluorescent carbon nanodots
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An investigation into the role of macromolecules of different polarity as passivating agent on the physical, chemical and structural properties of fluorescent carbon nanodots

机译：不同极性大分子对钝化剂对荧光碳纳多透射剂的钝化剂的调查

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摘要

In this study, comparative evaluation of fluorescent carbon nanodots (C-Dots) prepared using carob molasses was reported by screening various biocompatible macromolecules as passivating agent (PA). Incorporation of PAs with different molecular weight, polarity, and chemical structure was examined, and compared with the polyethylene glycol (PEG, Mn = 10 kN) passivated and pristine C-Dots. Not only the fluorescence properties but also many other features including size, crystal structure, colloidal conductivity, resistance to photobleaching, quantum yield, and UV-modulated surface interaction of them with the reactive oxygen species (ROS) as well as ROS production were investigated. Photoluminescence (PL) capacity of C-Dots was found to be associated with the number of surface alkyl groups and polymeric hydrogen bounding present on the C-Dot surface (increased number is associated with decreased PL) while surface conductivity of C-Dots in water was proportional to the PL intensity. More importantly, C-Dots with relatively poorer fluorescent were investigated in various organic solvents (hexane, methanol, acetone, ethanol, dimethylformamide (DMF), and DMSO). As happens with the fluorescent dyes, their PL intensities were significantly enhanced (even for pristine C-Dots) depending on the solvent characteristics. All of the C-Dots synthesized were further evaluated by means of UV-induced generation of ROS and inhibition of ROS by using H2O2 as model. In contrary to other carbonaceous nanomaterials, they did not show any ROS generation, on the contrary, they showed ROS scavenging activity that can be modulated by UV-irradiation (lambda(exc) = 365 nm). PEG and alginate passivated C-Dots inhibited H2O2 activity at LC50 values below 10 mg/mL.
机译：在该研究中，通过将各种生物相容性大分子筛选为钝化剂（PA），通过筛选各种生物相容性大分子（PA）来报道使用CaroB糖蜜制备的荧光碳纳多蛋白（C点）的比较评估。检查具有不同分子量，极性和化学结构的PA，并与聚乙二醇（PEG，Mn = 10kN）钝化和原始C-点进行比较。不仅研究了许多其他特征，还包括许多其他特征，包括尺寸，晶体结构，胶体导电性，抗光漂白，量子产率和与反应性氧物质（ROS）以及ROS产生的紫外线调节表面相互作用。发现C点的光致发光（PL）容量与C-点表面上存在的表面烷基数和聚合物氢偏向的能力相关（增加数量与降低的PL相关），而C-点在水中的表面电导率与PL强度成比例。更重要的是，在各种有机溶剂（己烷，甲醇，丙酮，乙醇，二甲基甲酰胺（DMF）和DMSO）中研究了具有相对较差的荧光的C点。与荧光染料发生在荧光染料中一样，根据溶剂特性，它们的Pl强度显着增强（即使是原始的C点）。通过使用H 2 O 2作为模型，通过UV诱导的RO和ROS抑制进一步评估合成的所有C点。与其他碳质纳米材料相反，它们没有显示任何生成，相反，它们显示了可以通过紫外线辐射（Lambda（Exc）= 365nm）调节的ROS清除活性。 PEG和藻酸盐钝化的C点抑制在10mg / mL以下LC50值下的H 2 O 2活性。

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