期刊
LANGMUIR
卷 29, 期 16, 页码 5085-5092出版社
AMER CHEMICAL SOC
DOI: 10.1021/la3050913
关键词
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资金
- National Natural Science Foundation of China [50973085, 51273151]
- Program for New Century Excellent Talents in University [NCET-11-0415]
- National Basic Research Program of China (973 Program) [2010CB732203]
- Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials
- Fundamental Research Funds for the Central Universities
- Japan Society for the Promotion of Science (JSPS)
We provide a highly sensitive and selective assay to detect cysteine (Cys) and Hg2+ in aqueous solutions using Au nanoparticles (NPs) stabilized by carboxylethyl quaternized cellulose (CEQC). This method is based on the thiophilicity of Hg2+ and Au NPs as well as the unique optical properties of CEQC-stabilized Au NPs. CEQC chains are good stabilizing agents for Au NPs even in a high-salt solution. The addition of Cys results in the aggregation of CEQC-stabilized Au NPs, which induces the visible color change and obvious redshift in UV-visible absorption spectra. On the other hand, Hg2+ is more apt to interact with thiols than Au NPs; thus, it can remove the Cys and trigger Au NP aggregate redispersion again. By taking advantage of this mechanism, a novel off-on colorimetric sensor has been established for Cys and Hg2+ detection. This new assay could selectively detect Cys and Hg2+ with the detection limits as low as 20 and 40 nM in aqueous solutions, respectively.
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