Electrochemical Sensor Based on Thioether Oligomer Poly(N‐vinylpyrrolidone)‐modified Gold Electrode for Bisphenol A Detection
Résumé
Presently, Bisphenol A (BPA) has been added to the list of substances of very high concern as endocrine disruptors. According to literature data, exposure to bisphenol A even at low doses may result in adverse health effects. In this study, new electrochemical sensor of Bisphenol A based on oligomer thioether DDT-Poly(N-vinylpyrrolidone) has been developed. The oligomer thioether, which is capable of recognizing BPA, was prepared and used for gold electrode modification. The characterization of the modified gold electrode was carried out by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and atomic force microscopy (AFM). Obtained results indicate that the electrode exhibits excellent electrochemical activity and sensitivity for BPA probably because of the repetition of the amide bond along the chain of the oligomer, which can create interaction with BPA molecules. The proposed sensor showed good performance for BPA determination with a linear range of 4.38 pM-87.6 pM (1pg/ml-20pg/ml). Several interfering species, such as phenolic compounds were used and their behaviors on the modified gold electrode were investigated.
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