Author/Authors :
Chandrashekar، Bannanakere N. نويسنده Department of P.G. Studies and Research in Industrial Chemistry, Kuvempu University, Shankaraghatta -577 451, Shimoga, Karnataka, India , , Kumara Swamy، Bahaddurghatta E. نويسنده Department of P.G. Studies and Research in Industrial Chemistry, Kuvempu University, Jnana Sahyadri, Shankaraghatta, Shimoga, Karnataka 577451, India , , Manjunatha ، Jamballi G. نويسنده Department of P.G. Studies and Research in Industrial Chemistry, Kuvempu University, Jnana Sahyadri, Shankaraghatta, Karnataka, India , , Pandurangachar، Mundargi نويسنده Department of Chemistry, SSMRV Degree College, Jayanagara 4T Block, Banglore-41, Karnataka, India , , Sherigara ، Bailure Sherigara S. نويسنده Department of P.G. Studies and Research in Industrial Chemistry, Kuvempu University, Jnana Sahyadri, Shankaraghatta, Karnataka, India ,
Abstract :
A stable modified carbon paste electrode based on the poly (tryptophan) film was
prepared by electrochemical polymerization technique using cyclic voltammetry. The
properties of the electrodeposited films, during preparation under different conditions and
their stability were evaluated. It was found that the current response of DA and AA were
greatly enhanced at this poly (tryptophan) modified carbon paste electrode. Moreover, the
anodic over-potential of AA was significantly reduced for about 150 mV (vs. SCE) compared
with that obtained at bare carbon paste electrode. The modified carbon paste electrode was
applied to the study of electrocatalytic oxidation of DA and AA which resolved the
overlapping of the anodic peaks of DA and AA in 0.1 mol L-1 acetate buffer solution at pH
6.5. The separation of the oxidation peak potentials for ascorbic acid–dopamine was about
0.277 V. Interference studies showed that the modified electrode exhibits excellent selectivity
towards DA and AA.
