Preparation of Silver Doped Poly(L-Aspartic Acid) Modified Electrode and Its Application for Determination of Dopamine
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.