title: A new strategy for determination of bisphenol A in the presence of Sudan I using a ZnO/CNTs/ionic liquid paste electrode in food samples.
abstract: The electrochemistry of bisphenol A (BPA) was studied by voltammetric methods at a surface of carbon paste electrode modified by a ZnO/CNTs nanocomposite and room-temperature ionic liquid of 1,3-dipropylimidazolium bromide. The ratio of ZnO/CNTs and ionic liquid (IL) on the surface of the electrode has to be controlled carefully because the charging currents. The anodic peaks of BPA and Sudan I in their mixture can be well separated. At pH 7.0 the two peaks are separated ca. 0.47 and 0.70 V, respectively; hence BPA can be determined in the presence of Sudan I and more than 8.7 times current excess of BPA. The peaks current of square wave voltammograms (SWV) of BPA and Sudan I increased linearly with their concentration in the ranges of 0.002-700 μmol L(-1)BPA and 0.2-800 μmol L(-1) Sudan I. The detection limits for BPA and Sudan I were 9.0 nmol L(-1) and 80 nmol L(-1), respectively. The modified electrode has been successfully applied for the assay of BPA in food samples. This study provides a simple and easy approach to selectively detect BPA in the presence of Sudan I.
authors.affiliation: Department of Food Science, Mazandaran Science and Research Branch, Islamic Azad University, Mazandaran, Iran.
authors.forename: Maryam
authors.initials: M
authors.lastname: Najafi
authors.affiliation: Department of Food Science, Mazandaran Science and Research Branch, Islamic Azad University, Mazandaran, Iran. Electronic address: khalilzadeh73@gmail.com.
authors.forename: Mohammad A
authors.initials: MA
authors.lastname: Khalilzadeh
authors.affiliation: Department of Chemistry, Graduate University of Advanced Technology, Kerman, Iran. Electronic address: h.karimi.maleh@gmail.com.
authors.forename: Hassan
authors.initials: H
authors.lastname: Karimi-Maleh
mesh_terms: D001559:Benzhydryl Compounds / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D005504:Food Analysis; D052578:Ionic Liquids / Q000737:chemistry*; D053761:Nanocomposites; D009284:Naphthols; D010636:Phenols / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D052578:Ionic Liquids; D009284:Naphthols; D010636:Phenols; D015034:Zinc Oxide; C024336:1-phenylazo-2-naphthol; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: Bisphenol A; Food analysis; Ionic liquid; Modified electrode; Sensor; Sudan I