Abstract:This paper aimed to develop a multi-walled carbon nanotubes/graphene （MWCNTs/GO）electrochemical electrode with excellent performance for the determination of sunset yellow （SY）.At 25℃，MWCNTs were ultrasonically dispersed in chitosan（CTS）solution to yield the CTS-MWCNTs dispersion.Then the dispersion was dropped on the glassy carbon electrode（GCE）surface，and the modified GCE was soaked in GO-sodium dodecyl benzene sulfonate （SDBS）composite solution for 2 min，to result in the CTS-MWCNTs/GO-SDBS/GCE.The electrochemical behaviors of SY were studied at CTS-MWCNTs/GO-SDBS/GCE by cyclic voltammetry（CV）and differential pulse voltammetry（DPV）in HAc-NaAc.The pH of the buffer solution was optimized.The results showed that the outer diameter of MWCNTs fell in the range of 4 nm～6 nm.According to the SEM image，the synthesized GO was shown as wrinkled sheets.The peak current and the concentration of SY showed good linear relationship within the concentration range of 2.0×10-7mol/L-4.0×10-5mol/L under the optimized conditions and the detection limit was 1.0×10-7mol/L，suggesting the stability of the modified electrode.Furthermore，the method was employed to determine the content of SY in a beverage（made with Citri Reticulatae Pericarpium）under optimized conditions，showing satisfactory accuracy and precision.