Flow electrochemical determination of ascorbic acid in real samples using a glassy carbon electrode modified with a cellulose acetate film bearing 2,6-dichlorophenolindophenol
Φόρτωση...
Ημερομηνία
Συγγραφείς
Florou, A. B.
Prodromidis, M. I.
Karayannis, M. I.
Tzouwara-Karayanni, S. M.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Analytica Chimica Acta
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
An 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.
Περιγραφή
Λέξεις-κλειδιά
electrochemical determination of ascorbic acid, controlled porosity cellulose acetate film, beverages, pharmaceuticals, flow injection analysis, 2,6-dichlorophenolindophenol, chemically modified electrodes, electrocatalytic oxidation, cobalt phthalocyanine, sensor, zeolite
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000085995900015
http://ac.els-cdn.com/S0003267000007091/1-s2.0-S0003267000007091-main.pdf?_tid=d20dcdedc239cf77178657fdb1c78710&acdnat=1333037108_e0946c434c712286a43dc63dca854d06
http://ac.els-cdn.com/S0003267000007091/1-s2.0-S0003267000007091-main.pdf?_tid=d20dcdedc239cf77178657fdb1c78710&acdnat=1333037108_e0946c434c712286a43dc63dca854d06
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας