Electrochemical Behavior and Voltammetric Determination of Quercetin in Foods by Graphene Nanosheets Modified Electrode

Quercetin belongs to the flavonol family. it is most abundant among the flavonoidmolecules. a method was developed for quantification of quercetin in apple and onion usingdifferential pulse voltammetry at graphene nanosheets modified glassy carbon electrode(gns/gce) and uv spectrophotometry as reference method. interest graphene centers on itsexcellent mechanical, electrical, thermal and optical properties, it’s very high specific surfacearea, and our ability to influence these properties through chemical functionalization. theelectrochemical behavior of quercetin at the gns/gce was investigated, and the resultsindicated that the electrode reaction was controlled by adsorption. the anodic peak currentalmost stops increasing after 260 s accumulation. this indicates that the accumulation ofquercetin at the electrode surface nearly reaches a saturation state after 260 s. theaccumulation potential was analyzed between -0.6 and 0.3 v, a maximum peak was achievedat 0.2 v. under the optimal conditions, the peak currents of dpv increased linearly with thequercetin concentration in the range from 0.006 to 10 ?m and 10 to 100 ?m with limit ofdetection 3.9 nm. the proposed method was successfully applied in the detection ofquercetin in foods.