Electrocatalysis of NADH oxidation at a glassy carbon electrode modified with pyrocatechol sulfonephthalein

✍ Scribed by Chen-Xin Cai; Lu-Hua Yin; Kuan-Hong Xue

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 153 KB
• Volume: 152
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(99)00295-2

✦ Synopsis

Ž .

Ž . The pyrocatechol sulfonephthalein PS modified glassy carbon PSrGC electrode, which was prepared by adsorption of PS on glassy carbon electrode surface, shows electrocatalytic activity toward NADH oxidation with an overpotential of ca. 310 mV lower than that of the bare electrode and a great enhancement of the anodic currents. The electrocatalytic rate Ž . constant k was determined using rotating disk electrode measurements in Britton-Robinson buffer solution at pH 7.0. It is found that the k is dependent on NADH concentration, the relation between k y1 and c can be fit to the line regression NADH 5 y1 Ž 3 y1 y1 . y1 Ž y3 . equation: 10 k dm mol s s 1.62286 q 0.65286 c mmol dm with correlation coefficient of 0.99964.

NADH

The experimental results also indicate that the presence of Ca 2q and Mg 2q in electrolyte can drastically enhance the electrocatalytic currents of NADH oxidation.