title: Electrochemical determination of Sudan I in food samples at graphene modified glassy carbon electrode based on the enhancement effect of sodium dodecyl sulphonate.
abstract: This paper describes a novel electrochemical method for the determination of Sudan I in food samples based on the electrochemical catalytic activity of graphene modified glassy carbon electrode (GMGCE) and the enhancement effect of an anionic surfactant: sodium dodecyl sulphonate (SDS). Using pH 6.0 phosphate buffer solution (PBS) as supporting electrolyte and in the presence of 1.5 × 10(-4)mol L(-1) SDS, Sudan I yielded a well-defined and sensitive oxidation peak at a GMGCE. The oxidation peak current of Sudan I remarkably increased in the presence of SDS. The experimental parameters, such as supporting electrolyte, concentration of SDS, and accumulation time, were optimised for Sudan I determination. The oxidation peak current showed a linear relationship with the concentrations of Sudan I in the range of 7.50 × 10(-8)-7.50 × 10(-6)mol L(-1), with the detection limit of 4.0 × 10(-8)mol L(-1). This new voltammetric method was successfully used to determine Sudan I in food products such as ketchup and chili sauce with satisfactory results.
authors: Department of Chemistry and Chemical Engineering, Heze University, Heze 274015, PR China.
authors: Xinying
authors: X
authors: Ma
authors: Mingyong
authors: M
authors: Chao
authors: Zhaoxia
authors: Z
authors: Wang
mesh_terms: D002273:Carcinogens / Q000032:analysis*; D004396:Coloring Agents / Q000032:analysis*; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D005506:Food Contamination / Q000032:analysis*; D059022:Food Safety; D006108:Graphite / Q000737:chemistry; D009284:Naphthols / Q000032:analysis*; D010084:Oxidation-Reduction
chemical_list: D002273:Carcinogens; D004396:Coloring Agents; D009284:Naphthols; C024336:1-phenylazo-2-naphthol; D006108:Graphite