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Colorimetric and visual detection of mercury(II) based on the suppression of the interaction of dithiothreitol with agar-stabilized silver-coated gold nanoparticles
被引:23
作者:

Da, Qiang
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Nanjing Med Univ, Sch Pharm, Nanjing 211166, Jiangsu, Peoples R China Nanjing Med Univ, Sch Pharm, Nanjing 211166, Jiangsu, Peoples R China

Gu, Yuanyuan
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Nanjing Med Univ, Sch Pharm, Nanjing 211166, Jiangsu, Peoples R China Nanjing Med Univ, Sch Pharm, Nanjing 211166, Jiangsu, Peoples R China

Peng, Xiafeng
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Nanjing Med Univ, Sch Basic Med Sci, Nanjing 211166, Jiangsu, Peoples R China Nanjing Med Univ, Sch Pharm, Nanjing 211166, Jiangsu, Peoples R China

Zhang, Liying
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Nanjing Med Univ, Sch Pharm, Nanjing 211166, Jiangsu, Peoples R China Nanjing Med Univ, Sch Pharm, Nanjing 211166, Jiangsu, Peoples R China

Du, Shuhu
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Nanjing Med Univ, Sch Pharm, Nanjing 211166, Jiangsu, Peoples R China Nanjing Med Univ, Sch Pharm, Nanjing 211166, Jiangsu, Peoples R China
机构:
[1] Nanjing Med Univ, Sch Pharm, Nanjing 211166, Jiangsu, Peoples R China
[2] Nanjing Med Univ, Sch Basic Med Sci, Nanjing 211166, Jiangsu, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Gel probe;
Visual detection;
Core-shell nanoparticles;
Thiophilicity;
Thiol-Ag chemistry;
Mercuric ion;
CORE-SHELL NANOPARTICLES;
CARBON DOTS;
NANORODS;
SPECTROMETRY;
FABRICATION;
PEROXIDASE;
SAMPLES;
IONS;
D O I:
10.1007/s00604-018-2899-y
中图分类号:
O65 [分析化学];
学科分类号:
070302 ;
081704 ;
摘要:
A colorimetric and visual method is described for the determination of mercury(II) ion. A gel consisting of agar-stabilized silver-coated gold nanoparticles (Au@Ag NPs) was prepared. The reaction with dithiothreitol (DTT) via thiol-Ag chemistry results in an orange to purple color change of the gel. However, in the presence of Hg(II), the reaction of DTT with the silver shells is suppressed due to the strong thiophilicity of Hg(II). The color of the gel changes from purple to red to orange in the presence of increasing concentrations of Hg(II). The Au@Ag NPs therefore are a viable optical probe for Hg(II) which can be detected in concentration as low as 78 nM via dual-wavelength ratiometric absorbance (A(390)/A(520)), and at 1 mu M levels with bare eyes. The use of agar as a support is mandatory to prevent the aggregation of the NPs and also improves selectivity. The method was applied to the analysis of spiked samples, and recoveries ranged between 96.3 and 104%. The assay is easy, inexpensive, and in our perception represents an attractive tool for on-site visual detection of Hg(II).
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