A selective and sensitive electrochemical method has been developed to determine the melamine in
milk samples by using ordered mesoporous carbon (OMC) as electrode modification material, based on
the oxidation of non-electroactive melamine monomers to electroactive dimers. OMC–Nafion modified
glassy carbon electrode (OMC–Nafion/GCE) showed more favorable electron transfer kinetics as well
as stronger and more stable electrocatalytic response toward melamine, from comparison to multiwall
carbon nanotubes modified GCE (MWCNTs–Nafion/GCE). Under optimal experimental conditions, the
OMC–Nafion/GCE electrode offered highly sensitive and rapid response to Mel at the potential of 0.7V
for saturated calomel electrode in 0.5 M H2SO4. The linear range of Mel concentration was from 5 × 10−8
to 7 × 10−6 M with a correlation coefficient of 0.999, and the detection limit was 2.4 × 10−9 M (S/N = 3).
The OMC–Nafion/GCE sensor was successfully applied to the determination of Mel in milk product and
showed high selectivity, sensitivity, and reproducibility