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首页> 外文期刊>Environmental Science & Technology >Sulfidation of Silver Nanoparticles Decreases Escherichia coli Growth Inhibition
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Sulfidation of Silver Nanoparticles Decreases Escherichia coli Growth Inhibition

机译：银纳米颗粒的硫化降低了大肠杆菌的生长抑制

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摘要

Sulfidation of metallic nanoparticles such as silver nanoparticles (AgNPs) released to the environment may be an important detoxification mechanism. Two types of AgNPs-an engineered polydisperse and aggregated AgNP powder, and a laboratory-synthesized, relatively monodisperse AgNP aqueous dispersion-were studied. The particles were sulfidized to varying degrees and characterized to determine the effect of initial AgNP polydispersity and aggregation state on AgNP sulfidation, and then exposed to Escherichia coli to determine if the degree of sulfidation of pristine AgNPs affects growth inhibition of bacteria. The extent of sulfidation was found to depend on the HS~-/Ag ratio. However, for the same reaction times, the more monodisperse particles were fully transformed to Ag_2S, and the polydisperse, aggregated particles were not fully sulfidized, thus preserving the toxic potential of Ag~0 in the aggregates. A higher Ag_2S:Ag~0 ratio in the sulndized nanoparticles resulted in less growth inhibition of E. coli over 6 h of exposure. These results suggest that the initial properties of AgNPs can affect sulfidation products, which in turn affect microbial growth inhibition, and that these properties should be considered in assessing the environmental impact of AgNPs.
机译：释放到环境中的金属纳米颗粒（如银纳米颗粒（AgNPs））的硫化可能是重要的排毒机理。研究了两种类型的AgNPs：工程化的多分散和聚集的AgNP粉末，以及实验室合成的相对单分散的AgNP水性分散体。将颗粒硫化至不同程度，并进行表征，以确定初始AgNP多分散度和聚集状态对AgNP硫化的影响，然后将其暴露于大肠杆菌以确定原始AgNP的硫化程度是否影响细菌的生长抑制。发现硫化程度取决于HS〜-/ Ag比。然而，对于相同的反应时间，更多的单分散颗粒被完全转化为Ag_2S，多分散的聚集颗粒没有被完全硫化，因此保留了聚集体中Ag〜0的潜在毒性。硫化纳米颗粒中较高的Ag_2S：Ag〜0比值导致暴露6小时后大肠杆菌的生长抑制作用降低。这些结果表明，AgNPs的初始性质会影响硫化产物，进而影响微生物的生长抑制，因此在评估AgNPs的环境影响时应考虑这些性质。

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  • 来源
    《Environmental Science & Technology》 |2012年第13期|p.6992-7000|共9页
  • 作者

    B. C. Reinsch; C. Levard; Z. Li; R.Ma; A. Wise; K. B. Gregory; G. E. Brown Jr.; G. V. Lowry;

  • 作者单位

    Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States Center for the Environmental Implications of Nanotechnology (CEINT), P.O. Box 90287, Duke University, Durham, North Carolina 27708-0287, United States;

    Center for the Environmental Implications of Nanotechnology (CEINT), P.O. Box 90287, Duke University, Durham, North Carolina 27708-0287, United States Surface and Aqueous Geochemistry Group, Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115, United States;

    Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States Center for the Environmental Implications of Nanotechnology (CEINT), P.O. Box 90287, Duke University, Durham, North Carolina 27708-0287, United States;

    Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States Center for the Environmental Implications of Nanotechnology (CEINT), P.O. Box 90287, Duke University, Durham, North Carolina 27708-0287, United States;

    Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 1S213, United States;

    Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States Center for the Environmental Implications of Nanotechnology (CEINT), P.O. Box 90287, Duke University, Durham, North Carolina 27708-0287, United States;

    Center for the Environmental Implications of Nanotechnology (CEINT), P.O. Box 90287, Duke University, Durham, North Carolina 27708-0287, United States Surface and Aqueous Geochemistry Group, Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115, United States Department of Photon Science and Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States;

    Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States Center for the Environmental Implications of Nanotechnology (CEINT), P.O. Box 90287, Duke University, Durham, North Carolina 27708-0287, United States;

  • 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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