Flow electrochemical determination of ascorbic acid in real samples using a glassy carbon electrode modified with a cellulose acetate film bearing 2,6-dichlorophenolindophenol

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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.accessioned2015-11-24T16:38:04Z
dc.date.available2015-11-24T16:38:04Z
dc.identifier.issn0003-2670-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/7996
dc.rightsDefault Licence-
dc.subjectelectrochemical determination of ascorbic aciden
dc.subjectcontrolled porosity cellulose acetate filmen
dc.subjectbeveragesen
dc.subjectpharmaceuticalsen
dc.subjectflow injection analysisen
dc.subject2,6-dichlorophenolindophenolen
dc.subjectchemically modified electrodesen
dc.subjectelectrocatalytic oxidationen
dc.subjectcobalt phthalocyanineen
dc.subjectsensoren
dc.subjectzeoliteen
dc.titleFlow electrochemical determination of ascorbic acid in real samples using a glassy carbon electrode modified with a cellulose acetate film bearing 2,6-dichlorophenolindophenolen
heal.abstractAn ascorbate sensor based on a glassy carbon electrode modified with a cellulose acetate polymeric film bearing 2,6-dichlorophenolindophenol (CA/DCPI-CME) was constructed. The overall reaction obeys a catalytic regeneration mechanism (EC mechanism) and the electrochemical rate constant kf for the electrocatalytic oxidation of ascorbic acid was evaluated. The modified electrodes were mounted in a flow injection (FI) manifold, poised at +100 mV versus Ag/AgCl/3 M KCl at pH 6.5 and utilized for the determination of ascorbic acid in beverages and pharmaceuticals. Good correlation with a reference method was attained. Interferents of various molecular sizes were tested. Calibration graphs were linear over the range 0.02-1 and 0.1-6 mM ascorbic acid for CA/DCPI sensors hydrolyzed in KOH and ZnCl2 solution, respectively. The throughput was 25 samples per hour and the CV was for a 0.4 mM ascorbic acid solution 0.75 (n=14) and 1.2% (n=10) for CA/DCPI sensors hydrolyzed in KOH and ZnCl2 solution, respectively. The recovery was 92-110%. The sensors showed very good repeatability and operational stability. (C) 2000 Elsevier Science B.V. All rights reserved.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.secondary<Go to ISI>://000085995900015-
heal.identifier.secondaryhttp://ac.els-cdn.com/S0003267000007091/1-s2.0-S0003267000007091-main.pdf?_tid=d20dcdedc239cf77178657fdb1c78710&acdnat=1333037108_e0946c434c712286a43dc63dca854d06-
heal.journalNameAnalytica Chimica Actaen
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2000-
heal.publisherElsevieren
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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