Simultaneous electrochemical determination of ascorbic acid, epinephrine, and uric acid using a polymer film-modified electrode based on Au nanoparticles/poly(3,3′,5,5′-tetrabromo-m-cresolsulfonphthalein)

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A new polymer film-modified electrode based on the Au nanoparticles/poly(3,3′,5,5′-tetrabromo-m-cresolsulfonphthalein)/glassy carbon electrode (Au-NPs/poly(BCG)/GCE) was prepared for the simultaneous determination of ascorbic acid (AA), epinephrine (EP), and uric acid (UA). The prepared electrode, Au-NPs/poly(BCG)/GCE, was characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and attenuated total reflectance–Fourier transform infrared spectroscopy (ATR-FTIR). The poly(BCG) film showed an efficient electrocatalytic activity for the oxidation of AA, UA, and EP. In addition, the prepared electrode separates the oxidation peak potential of AA-EP by 140 mV, and EP-UA by 140 mV, while the bare GCE cannot resolve them.