title: Surface-enhanced oxidation and detection of Sunset Yellow and Tartrazine using multi-walled carbon nanotubes film-modified electrode.
abstract: The insoluble multi-walled carbon nanotubes (MWNT) was successfully dispersed into water in the presence of hydrophobic surfactant. After that, MWNT film-coated glassy carbon electrode (GCE) was achieved via dip-coating and evaporating water. Owing to huge surface area, high sorption capacity and subtle electronic properties, MWNT film exhibits highly efficient accumulation efficiency as well as considerable surface enhancement effects to Sunset Yellow and Tartrazine. As a result, the oxidation peak currents of Sunset Yellow and Tartrazine remarkably increase at the MWNT film-modified GCE. Based on this, a novel electrochemical method was developed for the simultaneous determination of Sunset Yellow and Tartrazine. The limits of detection are 10.0 ng mL(-1) (2.2 x 10(-8)mol L(-1)) and 0.1 microg mL(-1) (1.88 x 10(-7)mol L(-1)) for Sunset Yellow and Tartrazine. Finally, the proposed method was successfully used to detect Sunset Yellow and Tartrazine in soft drinks.
authors: General Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China.
authors: Weikang
authors: W
authors: Zhang
authors: Tao
authors: T
authors: Liu
authors: Xiaojiang
authors: X
authors: Zheng
authors: Wensheng
authors: W
authors: Huang
authors: Chidan
authors: C
authors: Wan
mesh_terms: D001391:Azo Compounds / Q000032:analysis*; D004566:Electrodes; D005898:Glass / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010084:Oxidation-Reduction; D013499:Surface Properties; D013645:Tartrazine / Q000032:analysis*; D013997:Time Factors
chemical_list: D001391:Azo Compounds; D037742:Nanotubes, Carbon; C005842:6-hydroxy-5-((p- sulfophenyl)azo)-2-naphthalenesulfonic acid disodium salt; D013645:Tartrazine