title: Square-wave stripping voltammetric determination of caffeic acid on electrochemically reduced graphene oxide-Nafion composite film.
abstract: An electrochemical sensor composed of Nafion-graphene nanocomposite film for the voltammetric determination of caffeic acid (CA) was studied. A Nafion graphene oxide-modified glassy carbon electrode was fabricated by a simple drop-casting method and then graphene oxide was electrochemically reduced over the glassy carbon electrode. The electrochemical analysis method was based on the adsorption of caffeic acid on Nafion/ER-GO/GCE and then the oxidation of CA during the stripping step. The resulting electrode showed an excellent electrocatalytical response to the oxidation of caffeic acid (CA). The electrochemistry of caffeic acid on Nafion/ER-GO modified glassy carbon electrodes (GCEs) were studied by cyclic voltammetry and square-wave adsorption stripping voltammetry (SW-AdSV). At optimized test conditions, the calibration curve for CA showed two linear segments: the first linear segment increased from 0.1 to 1.5 and second linear segment increased up to 10 µM. The detection limit was determined as 9.1×10(-8) mol L(-1) using SW-AdSV. Finally, the proposed method was successfully used to determine CA in white wine samples.
authors.affiliation: Istanbul University, Faculty of Engineering, Department of Chemistry, 34320 Avcılar Istanbul, Turkey. Electronic address: filik@istanbul.edu.tr.
authors.forename: Hayati
authors.initials: H
authors.lastname: Filik
authors.forename: Gamze
authors.initials: G
authors.lastname: Çetintaş
authors.forename: Asiye Aslıhan
authors.initials: AA
authors.lastname: Avan
authors.forename: Sevda
authors.initials: S
authors.lastname: Aydar
authors.forename: Serkan Naci
authors.initials: SN
authors.lastname: Koç
authors.forename: İsmail
authors.initials: İ
authors.lastname: Boz
mesh_terms: D000327:Adsorption; D002109:Caffeic Acids / Q000302:isolation & purification*; D002138:Calibration; D002244:Carbon / Q000737:chemistry; D055664:Electrochemical Techniques; D004566:Electrodes; D005465:Fluorocarbon Polymers / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D053761:Nanocomposites / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides; D015203:Reproducibility of Results; D014920:Wine / Q000032:analysis*
chemical_list: D002109:Caffeic Acids; D005465:Fluorocarbon Polymers; D010087:Oxides; C040402:perfluorosulfonic acid; D002244:Carbon; D006108:Graphite; C040048:caffeic acid
keywords: Caffeic acid; Nafion–graphene film; Stripping analysis; Voltammetry; Wine analysis