title: Electrochemical fabrication of a novel ZnO/cysteic acid nanocomposite modified electrode and its application to simultaneous determination of sunset yellow and tartrazine.
abstract: A new nanocomposite (ZnO/Cysteic acid) was deposited on glassy carbon electrode by cyclic voltammetry. Uniform deposition of the nanocomposite was observed by scanning electron microscopy. The electron transfer characteristics of two food additives, sunset yellow and tartrazine, were greatly improved on the modified electrode. The prepared electrode was used in the sensitive simultaneous determination of sunset yellow and tartrazine by differential pulse voltammetry. Linear calibration curves were obtained in the concentration ranges of 0.1-3.0, and 0.07-1.86μM, and detection limits of 0.03 and 0.01μM for sunset yellow and tartrazine, respectively. The proposed method was evaluated by determination of the dyes in processed soft drinks with satisfactory results (recovery>95% and RSD%<5%).
authors.affiliation: Department of Chemistry, Razi University, 67149 Kermanshah, Iran.
authors.forename: Parisa S
authors.initials: PS
authors.lastname: Dorraji
authors.affiliation: Department of Chemistry, Razi University, 67149 Kermanshah, Iran. Electronic address: fjalali@razi.ac.ir.
authors.forename: Fahimeh
authors.initials: F
authors.lastname: Jalali
mesh_terms: D001391:Azo Compounds / Q000032:analysis*; D004396:Coloring Agents / Q000032:analysis*; D003544:Cysteic Acid / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D005503:Food Additives / Q000032:analysis*; D053761:Nanocomposites / Q000737:chemistry*; D013645:Tartrazine / Q000032:analysis*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D005503:Food Additives; D003544:Cysteic Acid; C005842:6-hydroxy-5-((p- sulfophenyl)azo)-2-naphthalenesulfonic acid disodium salt; D013645:Tartrazine
keywords: Cysteic acid; Sunset yellow; Tartrazine; Voltammetry; ZnO nanofilm