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首页> 外文期刊>Environmental Science & Technology >Distribution of Fullerene Nanoparticles between Water and Solid Supported Lipid Membranes: Thermodynamics and Effects of Membrane Composition on Distribution
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Distribution of Fullerene Nanoparticles between Water and Solid Supported Lipid Membranes: Thermodynamics and Effects of Membrane Composition on Distribution

机译：富勒烯纳米颗粒在水和固体负载脂质膜之间的分布：热力学和膜组成对分布的影响

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摘要

The distribution coefficient (K_(lipw)) of fullerene between solid supported lipid membranes (SSLMs) and water was examined using different lipid membrane compositions. K_(lipw) of fullerene was significantly higher with a cationic lipid membrane compared to that with a zwitterionic or anionic lipid membrane, potentially due to the strong interactions between negative fullerene dispersions and positive lipid head groups. The higher K_(lipw) for fullerene distribution to ternary lipid mixture membranes was attributed to an increase in the interfacial surface area of the lipid membrane resulting from phase separation. These results imply that lipid composition can be a critical factor that affects bioconcentration of fullerene. Distribution of fullerene into zwitterionic unsaturated lipid membranes was dominated by the entropy contribution (ΔS) and the process was endothermic (ΔH ＞ 0). This result contrasts the partitioning thermodynamics of highly and moderately hydrophobic chemicals indicating that the lipid-water distribution mechanism of fullerene may be different from that of molecular level chemicals. Potential mechanisms for the distribution of fullerene that may explain these differences include adsorption on the lipid membrane surfaces and partitioning into the center of lipid membranes (i.e., absorption).
机译：使用不同的脂质膜组成检查了富勒烯在固体负载的脂质膜（SSLMs）和水之间的分布系数（K_（lipw））。与两性离子或阴离子脂质膜相比，阳离子脂质膜的富勒烯的K_（lipw）显着更高，这可能是由于负的富勒烯分散体和正的脂质头基团之间的强烈相互作用。富勒烯分配给三元脂质混合物膜的较高的K_（lipw）归因于相分离导致脂质膜的界面表面积增加。这些结果暗示脂质组成可能是影响富勒烯生物浓度的关键因素。富勒烯在两性离子不饱和脂质膜中的分布受熵贡献（ΔS）支配，过程是吸热的（ΔH＞ 0）。该结果与高度和中等疏水性化学物质的分配热力学相反，表明富勒烯的脂质-水分布机制可能与分子水平的化学物质不同。可以解释这些差异的富勒烯分布的潜在机理包括在脂质膜表面上的吸附以及在脂质膜中心的分配（即吸收）。

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  • 来源
    《Environmental Science & Technology》 |2015年第24期|14546-14553|共8页
  • 作者

    Yeonjeong Ha; Lynn E. Katz; Howard M. Liljestrand;

  • 作者单位

    Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas 78712, United States;

    Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas 78712, United States;

    Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, Texas 78712, 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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