Simultaneous Voltammetric Detection of Salsolinol and Uric Acid in the Presence of High Concentration of Ascorbic Acid with Gold Nanoparticles/Functionalized Multiwalled Carbon Nanotubes Composite Film Modified Electrode

Abstract This work demonstrates gold nanoparticles (AuNPs)/functionalized multiwalled carbon nanotubes ( f ‐MWCNT) composite film modified gold electrode via covalent‐bonding interaction self‐assembly technique for simultaneous determination of salsolinol (Sal) and uric Acid (UA) in the presence of high concentration of ascorbic acid (AA). In pH 7.0 PBS, the composite film modified electrode exhibits excellent voltammetric response for Sal and UA, while AA shows no voltammetric response. The oxidation peak current is linearly increased with concentrations of Sal from 0.24–11.76 μmol L −1 and of UA from 3.36–96.36 μmol L −1 , respectively. The detection limits of Sal and UA is 3.2×10 −8 mol L −1 and 1.7×10 −7 mol L −1 , respectively.