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Please use this identifier to cite or link to this item: https://olympias.lib.uoi.gr/jspui/handle/123456789/10592
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dc.contributor.authorFlorou, A. B.en
dc.contributor.authorProdromidis, M. I.en
dc.contributor.authorKarayannis, M. I.en
dc.contributor.authorTzouwara-Karayanni, S. M.en
dc.date.accessioned2015-11-24T16:57:33Z-
dc.date.available2015-11-24T16:57:33Z-
dc.identifier.issn1040-0397-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/10592-
dc.rightsDefault Licence-
dc.subjectelectrocatalytic oxidation of nadhen
dc.subjectdcpi chemically modified electrodesen
dc.subjectcyclic voltammetryen
dc.subjectflow injection analysisen
dc.subjectchemically modified electrodesen
dc.subjectdihydronicotinamide adenine-dinucleotideen
dc.subjectpotential sweep voltammogramen
dc.subjectascorbic-aciden
dc.subjectnicotinamide coenzymesen
dc.subjectcatalytic-oxidationen
dc.subjectgeneral expressionen
dc.subjectmeldola blueen
dc.subjectstabilityen
dc.subjectenzymesen
dc.titleElectrocatalytic oxidation of NADH in flow analysis by graphite electrode modified with 2,6-dichlorophenolindophenol saltsen
heal.typejournalArticle-
heal.type.enJournal articleen
heal.type.elΆρθρο Περιοδικούel
heal.identifier.secondary<Go to ISI>://000078599000006-
heal.identifier.secondaryhttp://onlinelibrary.wiley.com/store/10.1002/(SICI)1521-4109(199812)10:18<1261::AID-ELAN1261>3.0.CO;2-M/asset/1261_ftp.pdf?v=1&t=h0dzrdih&s=5dcff3cd443ed0a64b425fe4e9f66f0e0462088a-
heal.languageen-
heal.accesscampus-
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.publicationDate1998-
heal.abstractThe preparation of a 2,6-dichlorophenolindophenol (DCPI) modified graphite electrode is described. DCPI was successfully immobilized by physical adsorption onto a plain graphite electrode (DCPI-CME) and onto graphite electrodes pretreated with lanthanum nitrate (DCPI-La-CME) or thorium nitrate (DCPI-Th-CME). The electrochemical behavior of DCPI-CME was extensively studied using cyclic voltammetry. The electrochemical redox reaction of DCPI was found to be fairly reversible at low coverage with E degrees' = + 55 mV (vs. Ag/AgCl/3M KCl) at pH 6.5. A pK(a) value of 5.8 +/- 0.1 for immobilized form of DCPI is determined from the intersection of the lines in the plot E degrees' vs. pH. The current I-p has a linear relationship with the scan rate up to 1200 mV s(-1), which is indicative for very fast electron transfer kinetics. The calculated value of the standard rate constant is k degrees = 18 +/- 4 s(-1). No decrease of either the anodic or the cathodic current of the cyclic voltammogram was observed after 500 runs of successive sweeps. The influence of the morphology of the electrode surface on the electrochemical behavior of the DCPI-CME was studied and a mathematical model is proposed, which partly describes the dependence of the geometrical area of the electrode surface on the grid of the emery paper. The modified electrodes were mounted in a flow-injection manifold, poised at +60 mV (vs. Ag/AgCl/3M KCl) and a catalytic current due to the oxidation of NADH was observed reducing thus the oxidation overpotential of NADH for about 400 mV. Interference from various reductive species present in real samples was investigated. The repeatability was 1.2% RSD (n = 10 for 0.1 mM NADH). The sensor showed good operational and storage stability.en
heal.publisherWILEY-VCH Verlagen
heal.journalNameElectroanalysisen
heal.journalTypepeer reviewed-
heal.fullTextAvailabilityTRUE-
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