title: Determination of Sudan I in drinks containing Sunset yellow by adsorptive stripping voltammetry.
abstract: An efficient, fast and sensitive method for the determination of Sudan I (SI) in drinks containing Sunset yellow (Sy) is developed and validated using an adsorptive stripping voltammetric procedure. Sy is currently added to a large number of foods; however during their synthesis SI may be produced. The determination is based on adsorption of Sy and SI onto HMDE and later reduction of the azo group at -0.71 and -0.82V, respectively. Using the best set of the experimental conditions (pH 12.3; Eads: -0.40V) for the determination of SI in Sy, a linear response for SI in the concentration range 0.5-27.2μgL(-1) was found, with a detection limit of 1.5μgL(-1) in a tads of only 30s. The method was applied to the determination of SI in commercial drinks with satisfactory results. The presence of SI was confirmed by mass spectrometry.
authors.affiliation: Pontificia Universidad Católica de Chile, Chemistry Faculty, Vicuña Mackenna 4860, Santiago 7820436, Chile. Electronic address: mtgomez@uc.cl.
authors.forename: Marisol
authors.initials: M
authors.lastname: Gómez
authors.affiliation: Pontificia Universidad Católica de Chile, Chemistry Faculty, Vicuña Mackenna 4860, Santiago 7820436, Chile. Electronic address: darancim@uc.cl.
authors.forename: Verónica
authors.initials: V
authors.lastname: Arancibia
authors.affiliation: Pontificia Universidad Católica de Chile, Chemistry Faculty, Vicuña Mackenna 4860, Santiago 7820436, Chile.
authors.forename: Margarita
authors.initials: M
authors.lastname: Aliaga
authors.affiliation: Pontificia Universidad Católica de Chile, Chemistry Faculty, Vicuña Mackenna 4860, Santiago 7820436, Chile.
authors.forename: Claudia
authors.initials: C
authors.lastname: Núñez
authors.affiliation: Pontificia Universidad Católica de Chile, Chemistry Faculty, Vicuña Mackenna 4860, Santiago 7820436, Chile.
authors.forename: Carlos
authors.initials: C
authors.lastname: Rojas-Romo
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000378:metabolism*; D001628:Beverages / Q000032:analysis*; D004396:Coloring Agents / Q000032:analysis*; D004563:Electrochemistry / Q000295:instrumentation*; D057230:Limit of Detection; D009284:Naphthols / Q000032:analysis*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D009284:Naphthols; C024336:1-phenylazo-2-naphthol; C005842:6-hydroxy-5-((p- sulfophenyl)azo)-2-naphthalenesulfonic acid disodium salt
keywords: Adsorptive stripping voltammetry; Commercial dye liquid for pastry; Orange energy drinks; Sudan I; Sunset yellow