Journal
ANALYTICA CHIMICA ACTA
Volume 675, Issue 1, Pages 24-28Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2010.07.002
Keywords
3,4-Dihydroxyphenylacetic acid; Melamine; Cyclic voltammetry; Hydrogen-bonding; Differential pulse voltammetry
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Funding
- National Natural Science Foundation of China [20877099]
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences [SKLEAC2010005]
- 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]
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A new electrochemical sensor for melamine with 3,4-dihydroxyphenylacetic acid as the recognition element is established. The results of Fourier Transform Infrared (FT-IR) spectra demonstrate that melamine may interact with 3,4-dihydroxyphenylacetic acid to form a complex mainly through the hydrogen-bonding interaction. The electrochemical behavior of 3,4-dihydroxyphenylacetic acid in the presence of melamine was studied. The anodic peak currents of 3,4-dihydroxyphenylacetic acid obtained by differential pulse voltammetry are linear with the logarithm of melamine concentrations in the range from 1.0 x 10(-8) to 5.0 x 10(-6) M with a linear coefficiency of 0.997. The detection limit is 3.0 x 10(-9) M. The proposed method displayed an excellent sensitivity and was successfully applied to the determination of melamine in milk products. (C) 2010 Elsevier B.V. All rights reserved.
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