Beijing Engineering Research Center for BioNanotechnology & Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, National Center for NanoScience and Technology, Beijing 100190, China.
Nanoscale. 2015 Feb 7;7(5):2042-9. doi: 10.1039/c4nr06726f.
We report a method for rapid, effective detection of both Cr(iii) and Cr(vi) (in the form of Cr(3+) and Cr2O7(2-), the main species of chromium in the natural environment) by making use of meso-2,3-dimercaptosuccinic acid (DMSA)-functionalized gold nanoparticles (Au NPs). The limit of detection (LOD) is 10 nM with the naked eye and the assay can be applied in detecting chromium in polluted soil from Yun-Nan Province in Southwest China. We use density functional theory to calculate the change of the Gibbs free energy (ΔG) of the interactions between the DMSA-Au NP system and various metal ions, which shows that DMSA-Au NPs have high specificity for both Cr(3+) and Cr2O7(2-).
我们报告了一种利用间-2,3-二巯基丁二酸（DMSA）功能化的金纳米粒子（Au NPs）快速、有效地检测 Cr(iii)和 Cr(vi)（分别以 Cr(3+)和 Cr2O7(2-)的形式存在，是自然环境中铬的主要存在形式）的方法。该方法的检测限（LOD）为 10 nM，肉眼即可检测，并且该方法可应用于检测中国西南云南省受污染土壤中的铬。我们使用密度泛函理论计算了 DMSA-Au NP 系统与各种金属离子相互作用的吉布斯自由能（ΔG）变化，结果表明 DMSA-Au NPs 对 Cr(3+)和 Cr2O7(2-)具有高特异性。
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