title: Amperometric detection of Sudan I in red chili powder samples using Ag nanoparticles decorated graphene oxide modified glassy carbon electrode.
abstract: A simple and sensitive electrochemical method was developed to determine the concentration of Sudan I in chili powder based on silver nanoparticles decorated graphene oxide modified glassy carbon electrode (AgNPs@GO/GCE). The voltammetry behaviour of Sudan I on modified GCE was investigated in phosphate buffer medium (PBS) with various pH ranges and the electron transfer properties were studied. It is found that the AgNPs@GO/GCE can catalyse the reduction of azo group, -N=N- followed by electrochemical oxidation of (-)OH group present in Sudan I dye molecule. Quantitative detection of Sudan I present in food products was carried out by amperometry method in which reduction potential was fixed at -0.77 V vs. Ag/AgCl. The amperometry method showed an excellent performance with a sensitivity of 6.83 μA mM(-1) and a detection limit of 11.4 × 10(-7)ML(-1). A linear calibration graph was constructed in the ranging 3.90 × 10(-6) to 3.19 × 10(-5)ML(-1). The method was successfully applied for the determination of Sudan I in red chili powder samples.
authors: Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India.
authors: E
authors: E
authors: Prabakaran
authors: Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India. Electronic address: jeevapandian@yahoo.co.uk.
authors: K
authors: K
authors: Pandian
mesh_terms: D002212:Capsicum / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D006108:Graphite / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D009284:Naphthols; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D012834:Silver / Q000737:chemistry*
chemical_list: D009284:Naphthols; D010087:Oxides; D012834:Silver; C024336:1-phenylazo-2-naphthol; D002244:Carbon; D006108:Graphite
keywords: AgNPs decorated graphene oxide; Amperometry method; Sudan I