▎ 摘　　要

Uniform triangular gold nanoplates(Au TNPs) with good conductivity were synthesized through a seeded growth process, and then modified on surface of glassy carbon electrode(GCE) using graphene oxide(GO) as carrier and Nafion polyanion as protecting agent, finally forming a nanocomposite modified electrode of GO/Au TNPs/Nafion/GCE. The morphologies of the nanocomposites were characterized by means of scanning electron microscopy and atomic force microscopy. The electrochemical behaviors of L-tryptophan(L-Trp) were investigated via cyclic voltammetry(CV) and differential pulse voltammetry(DPV), indicating that GO/Au TNPs/Nafion composite exhibited excellent electrocatalytic oxidation activity to L-Trp. The DPV method was employed for the determination of L-Trp in 0.10 mol/L PBS(pH=3.5), and a good linear relationship between the peak currents and the concentrations of L-Trp was obtained in the range from 4.000x10(-8) to 6.000x10(-5) mol/L, with a detection limit of 1.000x10(-8) mol/L(S/N=3). Furthermore, the modified electrode possessed good reproducibility, stability and selectivity, which can be used for the determination of L-Trp in pork serum samples with recoveries of 93.1%-105.9%, indicating that the proposed method is valuable in practical application on healthy breeding bio-analysis field.