Preparation of Silver Doped Poly(L-Aspartic Acid) Modified Electrode and Its Application for Determination of Dopamine / 分析化学

ABSTRACT

The silver doped poly(L-aspartic acid) modified electrode was prepared by cyclic voltammetric method. The voltammetric behavior of dopamine and cyclic voltammetric method for the determination of dopamine were studied on the silver doped poly(L-aspartic acid) modified electrode. In pH 7.0 phosphate buffer solution, the peak potential was 0.191 V of Epa and 0.161 V of Epc(vs.Ag/AgCl) at the scan rate of 50 mV/s. The linear ranges for the determination of dopamine were 3.0×10-7-1.0×10-5 mol/L and 1.0×10-5-5.0×10-4 mol/L. The detection limit was 5.0×10-8 mol/L. The method was applied to the determination of dopamine in drug and urine with satisfactory results.