Abstract
The electrochemical behavior and the electrocatalytic activity for the NADH oxidation at glassy carbon paste electrodes (GCPEs) modified with Meldola Blue (MB) adsorbed onto acidic cc-zirconium phosphate (ZP*) have been investigated. Cyclic voltammetry and rotating disc electrode measurements, performed in Tris buffer solution (pH 7) in absence and in presence of different NADH concentrations, showed that: (i) the formal standard potential (E degrees') of NIB was found pH dependent, according to the equation E = E degrees (c)-0.059pH + 0.029log(1 + 10(pH-pKa)), where the best fitting value for pK(a) Was estimated to be 4.3 +/- 0.4; (ii) the best electrocatalytic response was obtained for MB-ZP*-modified GCPEs having a ratio between the glassy carbon powder (Sigradur K) and MB-ZP* of 19:1; (iii) the presence of polyethyleneimine in the paste has a significant beneficial effect on the electrocatalytic activity of the investigated modified electrodes. As a general conclusion, it was stated that the particular features of the MB-ZP*-GCPEs are related to the ZP* crystallinity.
| Original language | English |
|---|---|
| Pages (from-to) | 67-74 |
| Journal | Revue Roumaine de Chimie |
| Volume | 52 |
| Issue number | 1-2 |
| Publication status | Published - 2007 |
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