Fabrication of β-cyclodextrin-coated poly (diallyldimethylammonium chloride)-functionalized graphene composite film modified glassy carbon-rotating disk electrode and its application for simultaneous electrochemical determination colorants of sunset yellow and tartrazine

被引:129
作者
Ye, Xiaoliang [1 ]
Du, Yongling [1 ]
Lu, Daban [1 ]
Wang, Chunming [1 ]
机构
[1] Lanzhou Univ, Dept Chem, Lanzhou 730000, Peoples R China
基金
中国国家自然科学基金;
关键词
Glassy carbon-rotating disk electrode; Kinetic parameters; Functionalized graphene; Simultaneous determination; Sunset yellow; Tartrazine; PERFORMANCE LIQUID-CHROMATOGRAPHY; VOLTAMMETRIC DETERMINATION; SYNTHETIC DYES; NANOPARTICLES; DISPERSIONS; RESOLUTION; MONOLAYER; REDUCTION; HYBRID; OXIDE;
D O I
10.1016/j.aca.2013.03.061
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
We proposed a green and facile approach for the synthesis of beta-cyclodextrin-coated poly(diallyldimethylammonium chloride)-functionalized graphene composite film (beta-CD-PDDA-Gr) by using L-ascorbic acid (L-AA) as the reducing agent at room temperature. The beta-CD-PDDA-Gr composite film modified glassy carbon-rotating disk electrode (GC-RDE) was then developed for the sensitive simultaneous determination of two synthetic food colorants: sunset yellow (SY) and tartrazine (TT). By cyclic voltammetry (CV), the peak currents of SY and TT increased obviously on the developed electrochemical sensor. The kinetic parameters, such as diffusion coefficient D and standard heterogeneous rate constant k(b), were estimated by linear sweep voltammetry (LSV). Under the optimal conditions, the differential pulse voltammetry (DPV) signals of SY and TT on the beta-CD-PDDA-Gr modified GC-RDE were significantly enhanced. The enhanced anodic peak currents represented the excellent analytical performance of simultaneous detection of SY and TT in the range of 5.0 x 10(-8) to 2.0 x 10(-5) mol L-1, with a low limit of detection (LOD) of 1.25 x 10(-8) mol L-1 for SY and 1.43 x 10(-8) mol L-1 for TT (SN-1 = 3). This proposed method displayed outstanding selectivity, good stability and acceptable repeatability and reproducibility, and also has been used to simultaneously determine SY and TT in some commercial soft drinks with satisfactory results. The obtained results were compared to HPLC of analysis for those two colorants and no significant differences were found. By the treatment of the experimental data, the electrochemical reaction mechanisms of SY and TT both involved a one-electron-one-proton-transfer process. (c) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:22 / 34
页数:13
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