Sensitive voltammetric sensor based on polyoxometalate/reduced graphene oxide nanomaterial: Application to the simultaneous determination of l-tyrosine and l-tryptophan

Abstract In this report, a novel voltammetric sensor based on polyoxometalate (H 3 PW 12 O 40 , POM) functionalized reduced graphene oxide (rGO) modified glassy carbon electrode (GCE) was presented for simultaneous determination of l -tyrosine ( l -Tyr) and l -tryptophan ( l -Trp). The nanocomposites were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The electrochemical determination of l -Tyr and l -Trp has been studied using square wave voltammetry (SWV) on GCE modified with POM-rGO composite (POM-rGO/GCE). The developed method was also applied successfully for the simultaneous determination of l -Tyr and l -Trp in spiked serum sample and the linearity range of l -Tyr and l -Trp was 1.0 × 10 −11  − 1.0 × 10 −9  M with the detection limit of 2.0 × 10 −12  M.

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