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Colorimetric Determination of Melamine by Pyridine-3-Boronic Acid Modified Gold Nanoparticles

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A rapid, simple and sensitive colorimetric detection method for melamine was proposed based on pyridine-3-boronic acid (PBA) modified gold nanoparticles (AuNPs). The formation of supramolec-ular hydrogen-bonded structure between PBA and melamine resulted in the aggregation of PBA modified AuNPs and the color change from red to blue. Melamine could be detected by colorimetric response of AuNPs that could be detected by naked eyes or a UV-vis spectrophotometer. The detection concentration of melamine ranged from 6.0 × 10−8 to 1.6 × 10−6 M, and the detection limit (3σ) was 3.0 × 10−8 M (i.e., 3.2 ppb). This provided an effective and facile colorimetric sensor for real-time and on-site determination of melamine. Particularly, the proposed method could be used to detect melamine in pretreated liquid milk products with high sensitivity and low interference, and the recoveries were from 95% to 102%.
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Document Type: Research Article

Publication date: 01 March 2012

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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