Electrochemical Behavior of Oxytocin Hormone through its Cysteine Reduction Peak Using Glassy Carbon Electrode Modified with PolyFurfurylamine and Multi-Walled Carbon Nanotubes

Electrochemical behavior of oxytocin was studied using differential pulse voltammetric technique coupled with electrochemical sensor based on glassy carbon electrode (GCE) modified with multi-walled carbon nanotubes and polyfurfurylamine. The electrochemical behavior of oxytocin was investigated on the GCE and modified GCE through its cysteine (oxytocin component) reduction peak. Cysteine gives well defiened reduction peak at (-0.4) V versus Ag/AgCl.sat.KCl. The optimum conditions were tested, the effect of pH was examined and the calibration curves were contructed, a plot of current versus concentrations gives a straight line with r2 values 0.9938, 0.9835 and 0.9924, 0.9791 for GCE, Glassy Carbon Electrode/Poly Furfurylamine (GCE/PFA) and Glassy Carbon/ Multi-Walled Carbon Nanotubes/ poly Furfuryl Amine (GCE/MWCNTs/PFA) modified electrodes respectively. The GCE/MWCNTs/ PFA gives about three folds as much current as the GCE for a given oxytocin concentration.