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Effects of Electrochemical Pretreatments on NADH Oxidation at NAD + ‐Modified Carbon Paste Electrodes
Author(s) -
Saidman S. B.
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200203)14:6<449::aid-elan449>3.0.co;2-h
Subject(s) - electrochemistry , catalysis , electrode , cathodic protection , nad+ kinase , chemistry , carbon fibers , inorganic chemistry , carbon paste electrode , redox , materials science , nuclear chemistry , cyclic voltammetry , organic chemistry , enzyme , composite material , composite number
NAD + ‐modified carbon paste electrodes were anodically or cathodically pretreated. The influence of the electrode composition on the catalytic response for NADH oxidation after these pretreatments has been investigated. Potentiodynamic cycling for activation allows to reaching high catalytic response even with the paraffin‐richest electrode composition, which is the best configuration from a practical viewpoint. The results are in good agreement with a qualitative model for the carbon paste electrode that assumes the existence of surface sites in contact with the aqueous media and pasting liquid. Cathodic pretreatment also gives easier oxidation of NADH although this pretreatment did not produce the enhanced catalytic response as the percentage of pasting liquid increases.