By using cyclic voltammetric method a pyronine B (PB) and graphene (GR) copolymer waselectrochemical 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 excellentelectrochemical performances with higher conductivity and lower interfacial resistances. Voltammetricbehaviors of quercetin on PB-GR/CMWE were investigated by cyclic voltammetry, which gave a pairof well-defined redox response in pH 5.0 phosphate buffer solution. Under the selected conditions, theoxidation peak currents were in linear to quercetin concentration from 0.2 ~ 80.0 μmol L-1 with thedetection limit as 6.37×10-8 mol L-1(3σ). The fabricated PB-GR/CMWE was further used to detectquercetin in compound ginkgo leaf tablets with satisfactory results.
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