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首页> 外文期刊>Environmental Science & Technology >Porous Media-Induced Aggregation of Protein-Stabilized Gold Nanoparticles
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Porous Media-Induced Aggregation of Protein-Stabilized Gold Nanoparticles

机译：多孔介质诱导的蛋白质稳定化金纳米粒子的聚集

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摘要

Gold-nanoparticles (AuNPs) are employed for cancer treatment, drug delivery, chemical analyses, and many other uses. As AuNP manufacture increases, it is imperative that we understand the environmental fate of these nanoma- terials. We investigated the transport and stability of AuNPs under simulated groundwater conditions. Batch experiments indicated that 16 nm AuNPs stabilized with bovine serum albumin (BSA-cit-AuNPs) was slightly more stable under high ionic strength conditions than citrate-functionalized AuNPs (cit-AuNPs) of the same core size. Both types of AuNPs were injected into glass bead-packed columns and subjected to transport with varying NaCl and CaCl_2 concentrations. BSA- cit-AuNPs deposited less than cit-AuNPs in the presence of increasing concentrations of CaCl_2, but the opposite trend was observed in the presence of increasing concentrations of NaCl. This finding differed from the results obtained in the batch studies. Calculated attachment efficiencies (α) failed to reflect the observed experimental column data, with α at maximum only approaching 0.1 even though a majority of the AuNPs were retained in the column. Colloid filtration theory fails to predict and explain this discrepancy. We conclude that media induced nanopartide aggregation is responsible for the inconsistency.
机译：金纳米颗粒（AuNPs）用于癌症治疗，药物输送，化学分析和许多其他用途。随着AuNP产量的增加，我们必须了解这些纳米材料的环境命运。我们研究了在模拟地下水条件下AuNPs的迁移和稳定性。批处理实验表明，用牛血清白蛋白（BSA-cit-AuNPs）稳定的16 nm AuNPs在高离子强度条件下比相同核心大小的柠檬酸盐官能化AuNPs（cit-AuNPs）稳定。两种类型的AuNPs均被注入玻璃珠填充柱中，并在NaCl和CaCl_2浓度不同的条件下进行运输。在浓度增加的CaCl_2中，BSA-cit-AuNPs的沉积少于cit-AuNPs，但是在浓度增加的NaCl中，观察到相反的趋势。这一发现与在批处理研究中获得的结果不同。计算的连接效率（α）无法反映观察到的实验色谱柱数据，即使大多数AuNP被保留在色谱柱中，α的最大值也仅接近0.1。胶体过滤理论无法预测和解释这种差异。我们得出的结论是，介质诱导的纳米粒子聚集是造成不一致的原因。

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  • 来源
    《Environmental Science & Technology》 |2014年第3期|1532-1540|共9页
  • 作者

    Matthew Y. Chan; Peter J. Vikesland;

  • 作者单位

    Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States Institute for Critical Technology and Applied Science (ICTAS), Virginia Tech, Blacksburg, Virginia 24061, United States NSF-EPA Center for the Environmental Implications of Nanotechnology (CEINT), Virginia Tech, Blacksburg, Virginia 24061, United States;

    Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States Institute for Critical Technology and Applied Science (ICTAS), Virginia Tech, Blacksburg, Virginia 24061, United States NSF-EPA Center for the Environmental Implications of Nanotechnology (CEINT), Virginia Tech, Blacksburg, Virginia 24061, 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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  • 正文语种 eng
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