Electrocatalytic oxidation of NADH at carbon paste electrodes modified with Meldola Blue adsorbed on zirconium phosphate: effect of Ca2+ and polyethyleneimine

Ioana Ladiu, IC Popescu, Lo Gorton

Research output: Contribution to journalArticlepeer-review

27 Citations (SciVal)

Abstract

The basic electrochemistry of carbon paste electrodes modified with Meldola Blue adsorbed on zirconium phosphate (MB-ZP-CPEs) and their ability to oxidize NADH have been investigated. Three types of carbon powder (graphite and glassy carbon-type Sigradur K and G) were used to obtain MB-ZP-CPEs. On comparing cyclic voltammograms recorded at MB-ZP-CPEs, similarly prepared from the three different carbon powders, those made with Sigradur K exhibited the lowest background current, and the best MB electrochemistry, seen as the highest peak intensities and smallest peak separation. Using MB-ZP-CPEs based on Sigradur K a study on NADH oxidation was done focusing on the effect of the Ca2+ concentration in the contacting solution and on the addition of polyethyleneimine (PEI) into the paste. It can be stated that MB-ZP-CPEs based on Sigradur K and containing 1.23% (w/w) PEI exhibited the best behavior for NADH oxidation, measured by the highest electrocatalytic rate constant (8.2 x 10(3) M-1 s(-1)).
Original languageEnglish
Pages (from-to)296-303
JournalJournal of Solid State Electrochemistry
Volume9
Issue number5
DOIs
Publication statusPublished - 2005

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Analytical Chemistry (S/LTH) (011001004)

Subject classification (UKÄ)

  • Analytical Chemistry

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