Effective removal of surface-bound cetyltrimethylammonium ions from thiol-monolayer-protected Au nanorods by treatment with dimethyl sulfoxide/citric acid

Keisuke Nishida; Hideya Kawasaki

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Effective removal of surface-bound cetyltrimethylammonium ions from thiol-monolayer-protected Au nanorods by treatment with dimethyl sulfoxide/citric acid

机译：通过用二甲基亚砜/柠檬酸处理，有效地去除巯基单层保护的金纳米棒中表面结合的十六烷基三甲基铵离子

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Cetyltrimethylammonium bromide (CTAB)-based surfactants are typically used as morphology-directing/stabilising agents for gold nanorods (AuNRs), forming bilayers on their surface. However, the biological applications of AuNRs require the removal of surface-bound CTAB due its high toxicity and the poor colloidal stability of CTAB-covered AuNRs in biological media. Herein, we report a simple and effective strategy for removing surface-bound cetyltrimethylammonium (CTA) cations from poly(ethylene glycol)thiolate-protected AuNRs (PEG-AuNRs) by treatment with dimethyl sulfoxide/citric acid (DMSO/Cit), achieving residual CTA ion levels that cannot be detected by highly sensitive mass spectrometry or X-ray photoelectron spectroscopy (XPS) techniques. The DMSO/Cit treatment is thought to destabilise the Ag–Br–CTA complex on AuNRs, since citric acid forms strongly bound chelate complexes with CTA cations.

机译：基于十六烷基三甲基溴化铵（CTAB）的表面活性剂通常用作金纳米棒（AuNR）的形态定向/稳定剂，在其表面上形成双层。然而，AuNRs的生物学应用需要去除表面结合的CTAB，因为它的高毒性和在生物介质中CTAB覆盖的AuNRs的胶体稳定性差。本文中，我们报告了一种简单有效的策略，可通过用二甲亚砜/柠檬酸（DMSO / Cit）处理从聚（乙二醇）硫醇盐保护的AuNRs（PEG-AuNRs）中去除表面结合的十六烷基三甲基铵（CTA）阳离子无法通过高灵敏度质谱或X射线光电子能谱（XPS）技术检测到的CTA离子水平。 DMSO / Cit处理被认为会使AuNRs上的Ag-Br-CTA复合物不稳定，因为柠檬酸与CTA阳离子形成牢固结合的螯合物。

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《RSC Advances》 |2017年第29期|共5页
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Keisuke Nishida; Hideya Kawasaki;
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1. Effective removal of surface-bound cetyltrimethylammonium ions from thiol-monolayer-protected Au nanorods by treatment with dimethyl sulfoxide/citric acid [J] . Keisuke Nishida, Hideya Kawasaki RSC Advances . 2017,第29期

机译：通过用二甲基亚砜/柠檬酸处理，有效地去除巯基单层保护的金纳米棒中表面结合的十六烷基三甲基铵离子
2. An Effective Force Field for Molecular Dynamics Simulations of Dimethyl Sulfoxide and Dimethyl Sulfoxide-Water Mixtures [J] . Daan P. Geerke, Chris Oostenbrink, Nico F. A. van der Vegt, The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical . 2004,第4期

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3. An Effective Force Field for Molecular Dynamics Simulations of Dimethyl Sulfoxide and Dimethyl Sulfoxide-Water Mixtures [J] . Daan P. Geerke, Chris Oostenbrink, Nico F. A. van der Vegt, The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical . 2004,第4期

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4. Removal of Heavy Metals from Contaminated Soils by Washing with Citric Acid and Subsequent Treatment of Soil-washing Solutions [C] . Lei SUN, Han-qiao LIU, Guo-xia WEI, International Conference on Material Science and Environmental Engineering . 2014

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Effective removal of surface-bound cetyltrimethylammonium ions from thiol-monolayer-protected Au nanorods by treatment with dimethyl sulfoxide/citric acid

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