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Effect of surfactants on the signal of chemically modified amperometric electrodes

✍ Scribed by Geza Nagy; Imre Kapui; Lo Gorton

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
476 KB
Volume
24
Category
Article
ISSN
0925-4005

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✦ Synopsis

A special electrochemical pretreatment has been employed for a finely polished glassy carbon electrode surface to increase the adsorption of Meldola blue (7-dimethylamino-1,2-benzo-phenoxazine) redox mediator. The chemically modified glassy carbon electrode holding the adsorptive mediator layer can be used lo measure NADH concenlration amperometrically.

The interfering effect of non-ionic surfactants has been studied in the case of NADH measurements using a rotating-disc electrode technique and flow-injection analysis (FIA) measurements. The glassy carbon electrode response is less affected and could be regenerated much more easily than the response of a similar spectrographic graphite-based electrode studied earlier. Surface-active agents can influence the apparent coverage of the surface by the mediator.

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