Electrochemical sensing of melamine with 3,4-dihydroxyphenylacetic acid as recognition element.
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.
Cao
Qian
Q
College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, 19A YuQuan Road, Beijing 100049, China.
Zhao
Hong
H
He
Yujian
Y
Ding
Nan
N
Wang
Jian
J
D015102:3,4-Dihydroxyphenylacetic Acid / Q000737:chemistry*; D000818:Animals; D002417:Cattle; D055664:Electrochemical Techniques / Q000379:methods*; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D008892:Milk / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors; D014227:Triazines / Q000032:analysis* / Q000737:chemistry
D014227:Triazines; D015102:3,4-Dihydroxyphenylacetic Acid; C011907:melamine