期刊
ANALYTICAL METHODS
卷 4, 期 12, 页码 3937-3941出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ay25803j
关键词
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资金
- National Natural Science Foundation of China [21205003]
- China Scholarship Council [2009637056]
- Graduate Degree Thesis Innovation Foundation of Hunan Province [1960-71131110015]
- Science & Technology Foundation of Henan Province [122102310517]
In this paper, we report a simple, rapid and selective colorimetric visualization of arsenic using unmodified gold nanoparticles (AuNPs) and a phytochelatin-like peptide (gamma-Glu-Cys)(3)-Gly-Arg (denoted as PC3R). Arsenic prevented the peptide from attaching to the surface of AuNPs by coordinating to all the three cysteine residues of PC3R, thus preventing the PC3R-triggered AuNPs aggregation and color change. The present approach is selective to arsenic detection and is much faster and simpler than the conventional analytical methods. The detection limit is 20 nM, which is lower than the World Health Organization's (WHO) standard for drinking water. The feasibility for the detection of arsenic in groundwater has also been demonstrated. This method will be valuable for the design of new types of metal ions sensors and will likely lead to many colorimetric detection applications in environmental monitoring.
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