Analytical performance characteristics of thin and thick film amperometric microcells

Robert E. Gyurcsányi, Alessandra Cristalli, Géza Nagy, Livia Nagy, Cara Corder, Bradford D. Pendley, Stefan Ufer, H. Troy Nagle, Michael R. Neuman, Ernö Lindner

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Abstract

The analytical performance of amperometric microcells with different electrode geometries is compared for enzyme activity measurements. The microcells were fabricated with thin film photolithography or thick film screen-printing in four different designs. The cells made with the thin film process used flexible substrate with microelectrode array or a circular, disk-shaped working electrode. The screen-printed working electrodes had semicircle or disk shape on ceramic chips. Putrescine oxidase (PUO) activity measurement was used as a model. The determination of PUO activity is important in the clinical diagnosis of premature rupture of the amniotic membrane. An electropolymerized m-phenylenediamine size-exclusion layer was used to eliminate common interferences. The size exclusion layer revealed also to be advantageous in protecting the electrodes from fouling by putrescine (enzyme substrate). The electrode fouling of bare electrodes was insignificant for screen-printed electrodes, but very severe for electroplated platinum working electrodes. The microelectrode array electrodes demonstrated smaller RSD and higher normalized sensitivities for hydrogen peroxide and PUO activity. All the other electrodes were demonstrating comparable analytical performances.

Original languageEnglish
Pages (from-to)286-294
Number of pages9
JournalFresenius' Journal of Analytical Chemistry
Volume369
Issue number3
Publication statusPublished - Jan 1 2001

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ASJC Scopus subject areas

  • Biochemistry

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Gyurcsányi, R. E., Cristalli, A., Nagy, G., Nagy, L., Corder, C., Pendley, B. D., Ufer, S., Nagle, H. T., Neuman, M. R., & Lindner, E. (2001). Analytical performance characteristics of thin and thick film amperometric microcells. Fresenius' Journal of Analytical Chemistry, 369(3), 286-294.