Electrochemical Detection of Sunset Yellow by Nitrogen-doped Carbon Nanotube-modified Electrodes
In this work,the sunset yellow electrochemical sensor was constructed by nitrogen doped carbon nano-tubes modified glassy carbon electrode(N-MCNT/GCE).The cyclic voltammetry(CV)results showed that,com-pared with the bare glassy carbon electrode(GCE),the N-MCNT/GCE exhibited higher electrocatalytic activity for the oxidation reaction of sunset yellow(SY).The effects of scanning rate and pH value of electrolyte solution on the peak current and potential of sunset yellow oxidation reaction were also discussed.The differential pulse voltam-metry(DPV)results showed that,the response of SY on N-MCNT/GCE was linearly related to concentration,with a linear range of 0.2～100 μmol/L,detection limit of approximately 0.03 μmol/L.On this basis,the constructed SY sensor exhibited wide linear range,low detection limit,good stability and selectivity for the detection of sunset yellow in beverages,providing a certain theoretical basis for the detection of azo dyes in foods.
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