Investigation of a novel chronopotentiometric detection method using a redox mediator modified carbon electrode

Anita Nagy, Géza Nagy, Zsófia Fehér

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Chemically modified electrodes are often employed as sensing element in biosensors. In these cases, usually amperometric detection is employed. In this article chemically modified electrodes were prepared by adsorbing a benzophenoxazine type redox mediator molecule on the surface of an electrochemically pre-treated glassy carbon electrode. A special measurement method for electrochemical signal generation was worked out with biosensors. In this method, in the initial period, a short (1-10 s) controlled potential step is employed. After this the potential control is discontinued and the change of the electrode potential is followed in time with a zero current measuring apparatus. The rate of the potential change in a certain section of the relaxation curve is well correlated with the concentration of the species to be measured. In the paper the basic principles of the technique as well as some preliminary experimental results are summarised. In the experimental work NADH was used as a model compound.

Original languageEnglish
Pages (from-to)241-249
Number of pages9
JournalAnalytica Chimica Acta
Volume310
Issue number2
DOIs
Publication statusPublished - Jun 30 1995

Keywords

  • Benzophenoxazine
  • Biosensors
  • Potentiometry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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