Construction and Application of Chlorogenic Acid Electrochemical Sensor Based on ZIF-8@Ag/MWCNTs
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Abstract:
ZIF-8@Ag/MWCNTs electrochemical sensors were prepared and used for the quantitative analysis of chlorogenic acid. Ag nanoparticles have good electrical conductivity and electrocatalytic ability, and they can be effectively dispersed by the excellent specific surface area of ZIF-8. Therefore, ZIF-8@Ag nanocomposites were prepared by Ag+ in-situ reduction on the surface of ZIF-8 after ZIF-8 was synthesized at room temperature. Then, MWCNTs was used as the substrate and compounded with ZIF-8@Ag to form a modified working electrode, a highly sensitive electrochemical sensor was obtained for the analysis of chlorogenic acid. The electrochemically sensing capability of ZIF-8@Ag/MWCNTs/GCE was explored via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV) techniques. Under the optimized experimental conditions, the standard substance concentration of chlorogenic acid had a good linear relationship with oxidation peak current in the range of 5×10-8 mol/L~1×10-5 mol/L. The detection limit can be as low as 1.36×10-8 mol/L (S/N=3). The anti-interference ability, repeatability, and reproducibility of the modified electrode were investigated, and the results showed that the electrode had a strong anti-interference ability, and performed well in repeatability and reproducibility. When it is used for the detection of the actual sample green coffee bean diluent, the recovery rate was between 96.34%~103.34%. The method is simple and reliable, and can be used for rapid quantitative analysis of chlorogenic acid and actual samples of chlorogenic acid.
