期刊
BIOSENSORS & BIOELECTRONICS
卷 25, 期 12, 页码 2680-2685出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2010.04.046
关键词
3,5-Dihydroxybenzoic acid; Melamine; Gold nanoparticles; Hydrogen-bonding
类别
资金
- National Natural Science Foundation of China [20877099]
- 973 Project [2007CB935900]
- National Sci-Tech Major Special Item for Water Pollution Control and Management [2009ZX07527-007-03]
- State Key Laboratory of Natural and Biomimetic Drugs [20080208]
- Ministry of Science and Technique of China [2008AA100801]
A colorimetric, label-free, and nonaggregation-based gold nanoparticles probe has been developed for the detection of melamine. Gold nanoparticles were generated using 3,5-dihydroxybenzoic acid as a reducer without adding gold nanoparticle seeds at room temperature. Upon the addition of melamine, the reducer 3,5-dihydroxybenzoic acid can interact with melamine through strong hydrogen-bonding interaction. Consequently, the formation of gold nanoparticles was interrupted by melamine since there was not enough reducer for the reduction of Au3+ ion. And the color change from purple to yellowgreen with increasing melamine concentration was observed. The plasmon absorbance of the formed Au-NPs allows the quantitative detection of melamine. A sensitive linear correlation existed between the absorbance and the logarithm of melamine concentration ranging from 1 x 10(-9) M to 1 x 10(-5) M with a linear coefficiency of 0.993. The system has a high selectivity to melamine with a low detection limit of 8 x 10(-10) M. (C) 2010 Elsevier B.V. All rights reserved.
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