Fangyuan Zhao

Henan Institute of Engineering , Cheng, Henan Sheng, China

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Publications (3)9.21 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: The present paper describes to modify a double stranded DNA-octadecylamine (ODA) Langmuir-Blodgett film on a glassy carbon electrode (GCE) surface to develop a voltammetric sensor for the detection of trace amounts of baicalein. The electrode was characterized by atomic force microscopy (AFM) and cyclic voltammetry (CV). Electrochemical behaviour of baicalein at the modified electrode had been investigated in pH 2.87 Britton-Robinson buffer solutions by CV and square wave voltammetry (SWV). Compared with bare GCE, the electrode presented an electrocatalytic redox for baicalein. Under the optimum conditions, the modified electrode showed a linear voltammetric response for the baicalein within a concentration range of 1.0 × 10(-8)-2.0 × 10(-6) mol L(-1), and a value of 6.0 × 10(-9) mol L(-1) was calculated for the detection limit. And the modified electrode exhibited an excellent immunity from epinephrine, dopamine, glucose and ascorbic acid interference. The method was also applied successfully to detect baicalein in the medicinal tablets and spiked human blood serum samples with satisfactory results.
    Talanta 03/2011; 84(1):160-8. · 3.50 Impact Factor
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    ABSTRACT: We report on a voltammetric sensor for caffeine that is based on a glassy carbon electrode modified with Nafion and graphene oxide (GO). Itexhibits a good affinity for caffeine (resulting from the presence of Nafion), and excellent electrochemical response (resulting from the pressence of GO) for the oxidation of caffeine. The electrode enables the determination of caffeine in the range from4.0 × 10−7 to8.0 × 10−5molL−1, with a detection limit of 2.0 × 10−7molL−1. The sensor displays good stability, reproducibility, and high sensitivity. It was successfully applied to the quantitative determination of caffeine in beverages. FigureA new electrochemical sensor, based on graphene oxide (GO)-Nafion composite film modified glassy carbon electrode (GCE), was developed and used for detection of trace amounts of caffeine in a wide range with a low detection limit. KeywordsCaffeine–Nafion–Graphene oxide–Modified electrode–Voltammetry
    Microchimica Acta 01/2011; 174(3):383-390. · 3.43 Impact Factor
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    ABSTRACT: A novel voltammetric sensor, based on single-walled carbon nanotubes (SWNT) dispersed in Nafion and modified glassy carbon electrode (GCE), was fabricated and used to determine the trace amounts of dihydromyricetin (DMY). The electrochemical behavior of DMY at this sensor was investigated in 0.1 mol L−1 sulfuric acid solutions + 0.1 mol L−1 NaCl by cyclic voltammetry and squarewave voltammetry. Compared with bare GCE, the electrode presented an excellent response of DMY through an adsorption-controlled quasi-reversible process. Under the optimum conditions, the response peak currents were linear relationship with the DMY concentrations in the range of 1.0 × 10−7–1.0 × 10−5 mol L−1 with a detection limit of 9 × 10−8 mol L−1. Based on this voltammetric sensor, a simple and sensitive electroanalytical method for DMY was proposed and applied to quantitative determination of DMY in Ampelopsis grossedentata samples. In addition, the oxidation mechanism was proposed and discussed, which could be a reference for the pharmacological action of DMY in clinical study.
    Journal of Solid State Electrochemistry 16(4). · 2.28 Impact Factor

Publication Stats

3 Citations
243 Views
9.21 Total Impact Points

Institutions

  • 2011
    • Henan Institute of Engineering
      Cheng, Henan Sheng, China
    • Zhengzhou University
      • Department of Chemistry
      Zhengzhou, Henan Sheng, China