title: Simultaneous determination of Sunset yellow and Tartrazine in soft drinks using gold nanoparticles carbon paste electrode.
abstract: The monitoring of synthetic dyes in foods is very important due to their potential harmfulness to human beings. Herein, a carbon-paste electrode (CPE) that is chemically modified with gold nanoparticles (nAu) was fabricated and used for the determination of Sunset yellow (SY) and Tartrazine (Tz). Cyclic and differential pulse voltammetry (CV and DPV) results revealed two well-resolved anodic peaks for SY and Tz with remarkably increase in oxidation signals of these colourants. Based on this, a novel electrochemical method was developed for the simultaneous determination of SY and Tz. High sensitivity and selectivity, sub-micromolar detection limit, high reproducibility and regeneration of the electrode surface by simple polishing make the nAu-CPE electrode very suitable for the determination of SY and Tz in commercially available soft drinks. The detection limits was 3.0×10(-8) and 2.0×10(-9)moll(-1) for SY and Tz, respectively, which are remarkably lower than those reported previously for SY and Tz using other modified electrodes.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran. Electronic address: s.m.ghoreishi@kashanu.ac.ir.
authors.forename: Sayed Mehdi
authors.initials: SM
authors.lastname: Ghoreishi
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran.
authors.forename: Mohsen
authors.initials: M
authors.lastname: Behpour
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran.
authors.forename: Mahshid
authors.initials: M
authors.lastname: Golestaneh
mesh_terms: D001391:Azo Compounds / Q000032:analysis / Q000737:chemistry*; D002253:Carbonated Beverages / Q000009:adverse effects* / Q000032:analysis; D055664:Electrochemical Techniques / Q000379:methods; D004566:Electrodes; D006046:Gold / Q000737:chemistry*; D006801:Humans; D053758:Nanoparticles / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010084:Oxidation-Reduction; D013645:Tartrazine / Q000032:analysis / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D037742:Nanotubes, Carbon; D006046:Gold; C005842:6-hydroxy-5-((p- sulfophenyl)azo)-2-naphthalenesulfonic acid disodium salt; D013645:Tartrazine
keywords: Gold nanoparticles; Modified electrode; Simultaneous determination; Soft drinks; Sunset yellow; Tartrazine