Flow injection photoamperometric investigation of ascorbic acid using methylene blue immobilized on titanium phosphate

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dc.authoridDilgin, Yusuf/0000-0002-2980-6871
dc.contributor.authorDilgin, Y
dc.contributor.authorNisli, G
dc.date.accessioned2025-01-27T20:17:21Z
dc.date.available2025-01-27T20:17:21Z
dc.date.issued2006
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractMethylene blue (MB) was incorporated into titanium phosphate (TiP) after pretreatment of TiP with the gas, n-butyl amine. The dye is strongly retained and not easily leached from the layered host matrix. The adsorbed MB on TiP was used to prepare modified carbon paste electrodes (MCPE), which were studied voltammetrically and in amperometric flow injection (FI) mode for the electrocatalytic oxidation of ascorbic acid (AA). The electrochemical behavior of the immobilized dye was investigated with cyclic voltammetry, at a pH 7.0 phosphate buffer containing 0.5 M KCl, at different potential scan rates. The MB immobilized on the support underwent a quasi-reversible electrochemical redox reaction. A homemade flow-through electrochemical cell with a suitable transparent window for irradiation of the electrode surface was constructed and used for amperometric FI studies. The photoamperometric-FI conditions were optimized for sensitivity and reproducibility at a flow rate of 1.5 mL/min, a transmission tubing length of 25 cm, a sample injection volume of 100 mu L, and a constant applied potential of +100 mV vs. SCE. The calibration curve for AA was linear over the concentration range from 1.0x10(-6) to 2.5x10(-5) mol l(-1) for both amperometric and photoamperometric studies. But the slope of the photoelectrocatalytic FIA procedure was improved about 52% compared with those obtained without irradiation. The results obtained for AA determination in some pharmaceutical products are in good agreement with those obtained using the procedure involving the reaction between triiodide and AA.
dc.identifier.doi10.1080/00032710500536053
dc.identifier.endpage465
dc.identifier.issn0003-2719
dc.identifier.issn1532-236X
dc.identifier.issue3
dc.identifier.scopus2-s2.0-33644969920
dc.identifier.scopusqualityQ2
dc.identifier.startpage451
dc.identifier.urihttps://doi.org/10.1080/00032710500536053
dc.identifier.urihttps://hdl.handle.net/20.500.12428/21553
dc.identifier.volume39
dc.identifier.wosWOS:000235950200002
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherTaylor & Francis Inc
dc.relation.ispartofAnalytical Letters
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectflow injection analysis
dc.subjectmodified carbon paste electrode
dc.subjectphotoelectrocatalysis
dc.subjectmethylene blue
dc.subjectascorbic acid
dc.subjecttitanium phosphate
dc.titleFlow injection photoamperometric investigation of ascorbic acid using methylene blue immobilized on titanium phosphate
dc.typeArticle

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