NADH Oxidation Using Carbonaceous Electrodes Modified with Dibenzo‐Dithia‐Diazapentacene | Zendy

Munteanu FlorentinaDaniela | Zendy; Dicu Delia | Zendy; Popescu Ionel Catalin | Zendy; Gorton Lo | Zendy

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NADH Oxidation Using Carbonaceous Electrodes Modified with Dibenzo‐Dithia‐Diazapentacene

Author(s) -

Munteanu FlorentinaDaniela,

Dicu Delia,

Popescu Ionel Catalin,

Gorton Lo

Publication year - 2003

Publication title -

electroanalysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.574

H-Index - 128

eISSN - 1521-4109

pISSN - 1040-0397

DOI - 10.1002/elan.200390044

Subject(s) - redox , chemistry , electrochemistry , adsorption , inorganic chemistry , cyclic voltammetry , graphite , phenothiazine , glassy carbon , nuclear chemistry , voltammetry , electrode , organic chemistry , medicine , pharmacology

The electrochemical and the electrocatalytic behavior for NADH oxidation of a newly synthesized phenothiazine derivative, 16 H ,18 H ‐dibenzo[c,1]‐7,9‐dithia‐16,18‐diazapentacene (DDDP), adsorbed on solid spectrographic graphite and on graphite powder or on zirconium phosphate (ZP), both entrapped in carbon paste, were compared. Experiments using cyclic voltammetry and a rotating disk electrode, performed in different experimental conditions (various pH values and NADH concentrations), showed that i) in the pH range between 4 and 8, the E °' value for DDDP adsorbed on ZP becomes pH independent; ii) in contrast to other redox mediators, adsorption of DDDP on ZP induced a significant negative shift of the E °' value; iii) the reaction rate for electrocatalytic oxidation of NADH is markedly increased by adsorbing the mediator on ZP, being further improved by the presence of Ca 2+ ions in the solution.

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