Selective detection of o-diphenols on copper-plated screen-printed electrodes

Analytical Chemistry
Jyh-Myng ZenAnnamalai Senthil Kumar

Abstract

Selective detection of o-diphenols (e.g., catechol, dopamine, and pyrogallol) in the presence of simple phenols, m- and p- derivative diphenols, and ascorbic acid has been demonstrated on copper-plated screen-printed electrodes (CuSPEs) in pH 7.4 phosphate buffer solution. The CuSPE showed an unusual catalytic response at -0.05 V versus Ag/AgCl selectively to o-diphenolic compounds. The o-diphenols can thus be determined amperometrically through direct electrochemical oxidation in low potentials (approximately 0 V), where the CuSPE is much less subject to interfering reactions. Such a catalytic phenomenon cannot be observed on conventional Pt and glassy carbon electrodes. The selective mechanism is explained in terms of the formation of cyclic five-member complex intermediate (Cu(II)-o-quinolate). Most important of all, the common drawbacks of electrode fouling through polymerization were completely overcome in this system.

References

Sep 16, 1999·Journal of Chromatography. a·H Sirén, U Karjalainen
Dec 20, 1999·Journal of Agricultural and Food Chemistry·R de ArmasM E Legaz
May 1, 1996·Analytical Chemistry·E BurestedtG Marko-Varga

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Citations

Jan 13, 2006·Analytical and Bioanalytical Chemistry·Christine M Welch, Richard G Compton
Jan 25, 2006·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Cheng-Teng HsuJyh-Myng Zen
Mar 31, 2005·Journal of Pharmaceutical and Biomedical Analysis·Tânia Jacometo CastilhoLauro Tatsuo Kubota
Jul 25, 2014·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Tanmoy SahaPinaki Talukdar
Jun 15, 2004·Analytical Chemistry·Eric Bakker
Jan 16, 2008·Analytical Chemistry·Bernhard WolfrumSerge Lemay
Apr 17, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Ting-Kai HuangHsin-Tien Chiu

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