Study of the Electrochemical Behavior of Disperse Blue 1-Modified Graphite Electrodes. Application to the Flow Determination of NADH
| dc.contributor.author | D.V. Stergiou, | en |
| dc.contributor.author | M.I. Prodromidis, | en |
| dc.contributor.author | P.G. Veltsistas, | en |
| dc.contributor.author | N. Evmiridis | en |
| dc.date.accessioned | 2015-11-24T16:48:34Z | |
| dc.date.available | 2015-11-24T16:48:34Z | |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/9341 | |
| dc.rights | Default Licence | - |
| dc.subject | Disperse Blue 1-modified graphite electrode | en |
| dc.subject | Cyclic voltammetry | en |
| dc.subject | Electrocatalysis of NADH | en |
| dc.subject | Flow injection analysis | en |
| dc.title | Study of the Electrochemical Behavior of Disperse Blue 1-Modified Graphite Electrodes. Application to the Flow Determination of NADH | en |
| heal.abstract | The preparation and the electrochemical study of Disperse Blue 1-chemically modified electrodes (DB1-CME), as well as their efficiency for the electrocatalytic oxidation of NADH is described. The proposed mediator was immobilized by physical adsorption onto graphite electrodes. The electrochemical behavior of DB1-CME was studied with cyclic voltammetry. The electrochemical redox reaction of DB1 was found to be reversible, revealing two well-shaped pair of peaks with formal potentials 152 and β�’42"…mV, respectively, (vs. Ag/AgCl/3M KCl) at pH"…6.5. The current Ip has a linear relationship with the scan rate up to 800"…mV"…sβ�’1, which is indicative for a fast electron transfer kinetics. The dissociation constants of the immobilized DB1 redox couple were calculated pK1=4 and pK2=5. The electrochemical rate constants of the immobilized DB1 were calculated k1Β°=18"…sβ�’1 and k2Β°=23"…sβ�’1 (Ξ“=2.36"…nmol"…cmβ�’2). The modified electrodes were mounted in a flow injection manifold, poised at +150"…mV (vs. Ag/AgCl/3M KCl) and a catalytic current due to the oxidation of NADH was measured. The reproducibility was 1.4% RSD (n=11 for 30"…ΞΌM NADH) The behavior of the sensor towards different reducing compounds was investigated. The sensor exhibited good operational and storage stability. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | 10.1002/elan.200302902 | - |
| heal.identifier.secondary | http://onlinelibrary.wiley.com/doi/10.1002/elan.200302902/abstract | - |
| heal.journalName | Electroanalysis | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2004 | - |
| heal.publisher | WILEY-VCH Verlag | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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