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A comparative study on the efficacy of different probes to predict the photo-activity of nanotitanium dioxide toward biomolecules

机译：不同探针预测二氧化纳米氧化纳米钛光学活性的比较研究

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TiO2 is a reactive material able to cause the degradation of organic molecules following activation by UV light. This reactivity may be useful, e.g. in environmental or medical applications, but undesired when TiO2 is used as a UV filter in cosmetics and composites since it reduces the photo-stability of the material, and represents a possible pathway of injury. Conventional methods to measure the photoactivity of TiO2 include the degradation of small molecules or dyes. However the suitability of these methods to predict the photo-activity of TiO2 in biological systems is uncertain. This is the first product of a study, conducted within the FP7 EU project SETNanoMetro, that has as a main goal the standardizations of protocols to assess the oxidative potential of TiO2 nanopowders in biofluids. Here, the ability of a series of nano-TiO2 powders exhibiting different crystalline phases to degrade rhodamine B, a dye commonly used in photo-catalysis, and two model biomolecules (linoleic acid and 2-deoxyribose) under simulated sunlight was compared. Electron paramagnetic resonance (EPR) spectroscopy associated to different spin-probes or spin-traps was used to elucidate the reactive species involved in the processes. The results show how the photo-efficiency of TiO2 is affected by the kind of probe and by the presence of species that adsorb at the surface of the nanoparticles underlining the need of appropriate standard operating procedures (SOP) to evaluate the oxidative damage potential of semiconducting nanomaterials.
机译：TiO2是能够通过UV光激活后引起有机分子劣化的反应性材料。例如，这种反应性可能是有用的，例如，在环境或医学应用中，当TiO 2用作化妆品和复合材料中的UV过滤器时，不希望的应用，因为它降低了材料的光稳定性，并且代表了可能的损伤途径。测量TiO 2的光接活性的常规方法包括小分子或染料的降解。然而，这些方法预测生物系统中TiO2的光活性的适用性是不确定的。这是在FP7欧盟项目SetNanometro中进行的研究的第一个产品，其具有主要目标，其协议的标准化评估生物流体中TiO2纳米粉末的氧化潜力。这里，比较了一系列纳米TiO2粉末，其表现出不同的结晶相降解罗丹明B，常用于光催化中的染料，以及在模拟阳光下的两种模型生物分子（亚油酸和2-脱氧糖）。电子顺磁共振（EPR）与不同的旋转探针或旋转陷阱相关的光谱分子用于阐明该方法中涉及的反应性物质。结果表明，TiO2的光学效率如何受到探针的种类的影响，并且通过在纳米颗粒表面吸附的物种，强调适当的标准操作程序（SOP）来评估半导体的氧化损伤潜力纳米材料。

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  • 来源
    《RSC Advances》 |2015年第109期|共10页
  • 作者

    A. Marucco; E. Carella; I. Fenoglio;

  • 作者单位

    Dip. Chimica “G. Scansetti” Interdepartmental Centre for Studies on Asbestos and Other Toxic Particulates NIS - Nanostructured Interfaces and Surfaces University of Torino Italy.;

    Dip. Chimica “G. Scansetti” Interdepartmental Centre for Studies on Asbestos and Other Toxic Particulates NIS - Nanostructured Interfaces and Surfaces University of Torino Italy.;

    Dip. Chimica “G. Scansetti” Interdepartmental Centre for Studies on Asbestos and Other Toxic Particulates NIS - Nanostructured Interfaces and Surfaces University of Torino Italy.;

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