Author/Authors :
Jayakumar، Chinnappan نويسنده Department of Chemistry, Loyola Institute of Frontier Energy (LIFE), Loyola College, Chennai, Tamil Nadu, India , , Jeseentharani، Vedhakkani نويسنده Department of Chemistry, Loyola Institute of Frontier Energy (LIFE), Loyola College, Chennai, Tamil Nadu, India , , reddy، Yerramala Subba نويسنده Department of Chemistry, Loyola Institute of Frontier Energy (LIFE), Loyola College, Chennai, Tamil Nadu, India , , kulandainathan، Manickam Anbu نويسنده Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu, India , , Nagaraj، Karachalacheruvu Seetharamaiah نويسنده Department of Chemistry, Loyola Institute of Frontier Energy (LIFE), Loyola College, Chennai, Tamil Nadu, India , , Jeyaraj، Boniface نويسنده Department of Chemistry, Loyola Institute of Frontier Energy (LIFE), Loyola College, Chennai, Tamil Nadu, India ,
Abstract :
A new modified glassy carbon electrode (GCE) was prepared using gold
nanoparticles functionalized by 8-HQ. This modified surface was characterized by cyclic
voltammetry, differential pulse voltammetry, scanning electron microscopy and FT-Raman
spectroscopy. The modified electrode exhibits strong electrocatalytic activity towards the
oxidation of a mixture of L-dopa and ascorbic acid (AA) with reduction of over potentials.
Simultaneous analysis of this mixture at the conventional bare electrode surface is not
feasible. However, two well-resolved oxidation peaks for AA and L-dopa are observed in the
modified electrode and can be used for the estimation of AA and L-dopa simultaneously.
Simultaneous analysis of AA and L-dopa using the DPV method, shows that the oxidation
current is linear with L-dopa concentration in the range of 3.0–10 ?M with a detection limit
of about 0.31 ?M (S/N=3). The proposed method was applied for the detection of L-dopa in
real samples.
