Voltammetric Determination of L-Dopa Using a Carbon Nanotubes-Nafion Modified Glassy Carbon Electrode

摘要

A method for determination of L-dopa by the adsorption stripping voltammetry (ASV) using a multiwalled carbon nanotubes (MWNTs)-Nation modified glassy carbon electrode (GMGCE) was proposed.This chemically modified electrode (CME) shows a better stability.A sensitive oxidation peak was observed and the anodic peak potential is ca.0.374V (vs.SCE).The influences of various experimental parameters on the current peak were completely studied.Under the optimized condition,the method has been applied to the determination of L-dopa in samples.There is a good linear relationship between the peak current (i_p) and L-dopa concentration in the range of 3.5 x 10~(-7) ~ 1.5 x 10~(-5) mol/L,with the limit of detection 5.0 x 10~(-8) mol/L.