Journal
ANALYST
Volume 135, Issue 3, Pages 583-588Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b923424a
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Funding
- National Natural Science Foundation of China [20772038]
- 863 program [2009AA06A417]
- Program for Excellent Research Group of Hubei Province [2009CDA048]
- colleges' basic research and operation of MOE [CCNU09AO200]
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The purpose of this paper is to develop a sensitive and low-cost colorimetric method for detection of melamine using simple circuitry. The stable p-nitroaniline-modified silver nanoparticles (Ag NPs) were synthesized by a zero-length covalent coupling chemistry, which showed sensitivity and selectivity towards melamine. The melamine induces the aggregation of nanoparticles due to electron donor-acceptor interaction between melamine and p-nitroaniline at the Ag NP interface, resulting in a shift in the surface plasmon band and a consequent color change of the Ag NPs from yellow to blue. The color change was monitored using UV-vis spectrophotometry. More importantly, this optical method was successfully utilized to a practical infant formula sample. As low as 0.1 ppm melamine in infant formula could be distinguished upon a color change of solution in two minutes.
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