Pyronine B/Graphene Copolymer Modified Carbon Molecular Wire Electrode for Electrochemical Detection of Quercetin

Abstract

By using cyclic voltammetric method a pyronine B (PB) and graphene (GR) copolymer was electrochemical formed on carbon molecular wire electrode (CMWE) to get the working electrode (named as PB-GR/CMWE). The synergistic functions of PB and GR resulted in the excellent electrochemical performances with higher conductivity and lower interfacial resistances. Voltammetric behaviors of quercetin on PB-GR/CMWE were investigated by cyclic voltammetry, which gave a pair of well-defined redox response in pH 5.0 phosphate buffer solution. Under the selected conditions, the oxidation peak currents were in linear to quercetin concentration from 0.2 ∼ 80.0 µmol L−1 with the detection limit as 6.37×10−8 mol L−1 (3σ). The fabricated PB-GR/CMWE was further used to detect quercetin in compound ginkgo leaf tablets with satisfactory results.