Voltammetric behaviors of diethylstilbestrol and its determination at multi-wall carbon nanotubes modified glassy carbon electrode

AimTo fabricate multi-wall carbon nanotube (MWNT) modified electrode and study the electrochemical behaviors of diethylstilbestrol at the MWNT-modified electrode. MethodsCyclic voltammetry and linear sweep voltammetry. ResultsThe oxidation peak current of diethylstilbestrol increased remarkably and the peak potential shifted negatively at the MWNT-dihexadecyl hydrogen phosphate (DHP) modified glassy carbon electrode(GCE), in contrast to that at the bare GC electrode and DHP-modified GC electrode. The oxidation peak current is linear with the concentration of diethylstilbestrol over the range from 1×10^-8 to 2×10^-6 mol·L^-1. The detection limit was 2.5×10^-9 mol·L^-1. The relative standard deviation (n=10) was 2.9% for 1×10^-6 mol·L^-1 diethylstilbestrol. ConclusionThe MWNT-DHP modified GCE exhibits catalytic activity to the oxidation of diethylstilbestrol.