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首页> 外文期刊>Environmental Science & Technology >Aged TiO_2-Based Nanocomposite Used in Sunscreens Produces Singlet Oxygen under Long-Wave UV and Sensitizes Escherichia coli to Cadmium
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Aged TiO_2-Based Nanocomposite Used in Sunscreens Produces Singlet Oxygen under Long-Wave UV and Sensitizes Escherichia coli to Cadmium

机译：防晒霜中使用的老化的基于TiO_2的纳米复合材料在长波紫外线下产生单线态氧，并使大肠杆菌对镉敏感。

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摘要

TiO_2-based nanocomposite (NC) are widely used as invisible UV protectant in cosmetics. These nanomaterials(NMs) end in the environment as altered materials. We have investigated the properties of T-Lite SF, a TiO_2-NC used as sunscreen, after weathering in water and odder light. We have examined the formation of ROS and their consequences on ccB physiology of Escherichia coli. Our results show that aged-T-Lite SF produced singlet oxygen tinder low intensity long wave UV and formed hydroxyl radicals at high intensity. Despite the production of these ROS, T-Lite SF had neither effect on the viability of E coli nor on mutant impaired in oxidative stress, did not induce mutagenesis and did not impair the integrity of membrane lipids, thus seemed safe to bacteria. However, when pre-exposed to T-Lite SF under low intensity UV, cells turned out to be more sensitive to cadmium, a priority pollutant widely disseminated in soil and surface waters. This effect was not a Trojan hone: sensitization of cells was dependent on the formation of singlet oxygen. These results provide a basis for caution, especially on NMs that have no straight environmental toxicity. It is crucial to anticipate indirect and combined effects of environmental pollutants and NMs.
机译：TiO_2基纳米复合材料（NC）被广泛用作化妆品中的隐形UV防护剂。这些纳米材料（NMs）以改变的材料存在于环境中。我们已经研究了T-Lite SF（一种用作防晒剂的TiO_2-NC）在水和风中的风化后的性能。我们已经检查了ROS的形成及其对大肠杆菌ccB生理的影响。我们的结果表明，老化的T-Lite SF产生单重态氧oxygen低强度长波紫外线，并在高强度下形成羟基自由基。尽管产生了这些ROS，但T-Lite SF既不影响大肠埃希菌的存活力，也不影响氧化应激受损的突变体，不引起诱变，也不损害膜脂的完整性，因此对细菌来说是安全的。但是，当在低强度紫外线下预先暴露于T-Lite SF时，细胞对镉更加敏感，镉是广泛分布在土壤和地表水中的优先污染物。这种作用不是特洛伊木马磨刀石：细胞的敏感性取决于单线态氧的形成。这些结果为谨慎提供了依据，尤其是对于没有直接环境毒性的NM。预测环境污染物和NMs的间接和综合影响至关重要。

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  • 来源
    《Environmental Science & Technology》 |2014年第9期|5245-5253|共9页
  • 作者

    Catherine Santaella; Bruno Allainmat; France Simonet; Corinne Chaneac; Jerome Labille; Melanie Auffan; Jerome Rose; Wafa Achouak;

  • 作者单位

    CEA, IBEB, Laboratory of Microbial Ecology of the Rhizosphere and Extreme Environments, Saint-Paul-lez-Durance, F-13108, France,CNRS, UMR 7265 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France,Aix Marseille Universite, BVME UMR7265, Marseille, F-13284, France,GDRi iCEINT, International Consortium for the Environmental Implication of Nanotechnology, CEREGE, F-13545 Aix-en-Provence, France;

    CEA, IBEB, Laboratory of Microbial Ecology of the Rhizosphere and Extreme Environments, Saint-Paul-lez-Durance, F-13108, France,CNRS, UMR 7265 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France,Aix Marseille Universite, BVME UMR7265, Marseille, F-13284, France,GDRi iCEINT, International Consortium for the Environmental Implication of Nanotechnology, CEREGE, F-13545 Aix-en-Provence, France;

    IRCELYON, UMR 5256 CNRS- Lyon 1 Univ, Villeurbanne, F-69100, France;

    GDRi iCEINT, International Consortium for the Environmental Implication of Nanotechnology, CEREGE, F-13545 Aix-en-Provence, France,Chimie de la Matiere Condensee, UMR7574, College de France, Universite de Jussieu, Paris, F- 75231, France;

    GDRi iCEINT, International Consortium for the Environmental Implication of Nanotechnology, CEREGE, F-13545 Aix-en-Provence, France,CNRS, Aix-Marseille Universite, CEREGE UM34, UMR 7330, 13545 Aix en Provence, France;

    GDRi iCEINT, International Consortium for the Environmental Implication of Nanotechnology, CEREGE, F-13545 Aix-en-Provence, France,CNRS, Aix-Marseille Universite, CEREGE UM34, UMR 7330, 13545 Aix en Provence, France;

    GDRi iCEINT, International Consortium for the Environmental Implication of Nanotechnology, CEREGE, F-13545 Aix-en-Provence, France,CNRS, Aix-Marseille Universite, CEREGE UM34, UMR 7330, 13545 Aix en Provence, France;

    CEA, IBEB, Laboratory of Microbial Ecology of the Rhizosphere and Extreme Environments, Saint-Paul-lez-Durance, F-13108, France,CNRS, UMR 7265 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France,Aix Marseille Universite, BVME UMR7265, Marseille, F-13284, France,GDRi iCEINT, International Consortium for the Environmental Implication of Nanotechnology, CEREGE, F-13545 Aix-en-Provence, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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