Carbon Nanotube Paste Electrode for the Determination of Some Neurotransmitters: A Cyclic Voltammetric Study

A promising electrochemical sensor was developed by electro-polymerization of arginine on carbon nanotube paste electrode for the resolution of Dopamine in the presence of Uric acid and Ascorbic acid.The modified electrode shows excellent electrochemical catalytic activity towards the oxidation of dopamine.Cyclic voltammetry studies show the oxidation of dopamine at the poly-arginine modified carbon nanotube paste electrode surface is two electron Quasi-reversible process, diffusion-controlled process and showed improved current response compare to the bare carbon nanotube paste electrode.Under optimized conditions, the concentration range 8 × 10 -6 to 5 × 10 -5 M and 6 × 10 -5 to 2 × 10 -4 M and detection limit 10 × 10 -7 M was observed.The sensor has also applied to the resolution of dopamine in real sample with a satisfactory recovery.