灯盏花素在多壁碳纳米管修饰玻碳电极上的电化学行为及其测定___

Abstract objective: To fabricate multi-wall carbon nanotubes modified glassy carbon electrode (MWNT/GCE), the electrochemical behavior and determination of breviscapine  on the electrode were investigated. Methods: Cyclic voltammetry and differential pulse voltammetry. Results: The oxidation peak current of breviscapine inereased remarkably at the MWNT/GCE in contrast to that at the bare GCE. One pair of redox peaks of breviscapine at MWCNT/GCE was obtained by cyclic voltammetry in phosphatic buffer solution (pH=7.0) with 0.19 V of E_pa and 0.07 V of E_pc. The oxidiztion peak is linearly related to the concentration of breviscapine in the range of  2×10^-7-6×10^-5 mol·L^-1 and the detection limit  reach of to 2×10^-7 mol·L^-1. The RSD（n=5） was 0.37 % for breviscapine. The average recovery was 97.5 %–103.1 %. Conclusion: The MWMT/GCE exhibits eatalytic activity to the oxidation of breviscapine. The proposed method is accurate, sensitive and convenient for the determination of the conten of breviscapine.