Showing papers by "Prem Chandra Pandey published in 1998"

Sensitivity, Selectivity and Reproducibility of Some Mediated Electrochemical Biosensors/sensors

Abstract: Comparative studies on the mediated electrochemical response of tetracyanoquinodimethane (TCNQ), tetrahiafulvalene (TTF) and dimethyl ferrocene (dmFc) modified paste electrodes are reported based on cyclic voltammetry and amperometric measurements. The studies have been conducted on the graphite paste electrodes of different composition mainly; i) graphite and mediators (TCNQ/TTF/dmFc) paste only, ii) graphite, glucose oxidase and mediators (TCNQ/TTF/dmFc) modified paste, and iii) graphite, mediators (TCNQ/TTF/dmFc) and peroxidase modified paste. The results on the mediated electrochemical oxidation of NADH and glucose on the systems i–ii are reported. The cyclic voltammetry response of the systems i and ii for subsequent 15 cycles between -0.2 to 0.5 V Vs Ag/AgCl has been examined at a scan rate of 5 mV/s. The electrochemical oxidation of NADH has been studied on system i, whereas mediated electrochemical oxidation of glucose has been studied on system ii. The results suggest that TCNQ is a bett...