▎ 摘　　要

A graphene-zinc oxide (ZnO/GR) nanocomposite film was fabricated on the glassy carbon electrode (ZnO/GR/GCE), and used for the measurement of tyrosine (Tyr) by differential pulse voltammetry (DPV). It was found that the ZnO/GR nanocomposites can improve the peak currents of tyrosine significantly due to the synergetic effect. The oxidation peak current was linearly related to tyrosine concentration in the range from 1.0 mu M to 800.0 mu M. The detection limit was calculated to be 0.5 mu M (S/N = 3). Finally, the introduced electrode was successfully used for quantifying tyrosine in real samples.