title: A novel conducting poly(p-aminobenzene sulphonic acid)-based electrochemical sensor for sensitive determination of Sudan I and its application for detection in food stuffs.
abstract: In the present work, a new method for the determination of Sudan I has been developed based on a conducting poly(p-aminobenzene sulphonic acid) (poly(p-ABSA)) film modified electrode. The new electrochemical sensor showed strong accumulation ability and excellent electrocatalytic activity for Sudan I. Electrochemical oxidation signal of Sudan I at the poly(p-ABSA) modified glassy carbon electrode (poly(p-ABSA)/GCE) was significantly increased when compared to that at the bare GCE. The experimental conditions such as amount of alcohol, pH of buffer solution, accumulation time, and instrumental parameters for square wave anodic stripping voltammetry were optimised for the determination of Sudan I. Under optimum conditions, the linear regression equation of Sudan I was ip=1.868+0.1213c (ip: μA, c: μgL(-1), R=0.9981) from 1 to 500 μg L(-1) with a detection limit of 0.3 μg L(-1). Finally, this sensor was successfully employed to detect Sudan I in some hot chili and ketchup samples.
authors.affiliation: Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
authors.forename: Bang Lin
authors.initials: BL
authors.lastname: Li
authors.affiliation: Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
authors.forename: Jun Hua
authors.initials: JH
authors.lastname: Luo
authors.affiliation: Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China. Electronic address: hongqunluo@163.com.
authors.forename: Hong Qun
authors.initials: HQ
authors.lastname: Luo
authors.affiliation: Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China. Electronic address: linb@swu.edu.cn.
authors.forename: Nian Bing
authors.initials: NB
authors.lastname: Li
mesh_terms: D000814:Aniline Compounds; D002244:Carbon; D002273:Carcinogens / Q000032:analysis*; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D005504:Food Analysis / Q000379:methods*; D005505:Food Coloring Agents / Q000032:analysis*; D057230:Limit of Detection; D009284:Naphthols / Q000032:analysis*; D010084:Oxidation-Reduction; D058105:Polymerization; D015203:Reproducibility of Results; D013425:Sulfanilic Acids / Q000737:chemistry; D013451:Sulfonic Acids
chemical_list: D000814:Aniline Compounds; D002273:Carcinogens; D005505:Food Coloring Agents; D009284:Naphthols; D013425:Sulfanilic Acids; D013451:Sulfonic Acids; C100016:4-sulfanilic acid; C024336:1-phenylazo-2-naphthol; D002244:Carbon; C023650:aniline
keywords: Ethanol (PubChem CID: 702); Glassy carbon electrode; Poly(p-aminobenzene sulphonic acid); Square wave anodic stripping voltammetry; Sudan I; Sudan I (PubChem CID: 5858445); Sudan II (PubChem CID: 5809936); Sudan III (PubChem CID: 6789251); Sudan IV (PubChem CID: 5876571); p-Aminobenzenesulphonic acid (PubChem CID: 8479)