▎ 摘　　要

A simple electrochemical sensor to detect yohimbine (YOH) was developed based on graphene nanoplatelets (GrNPs) modified glassy carbon electrode (GrNPs/GCE) to improve the sensitivity. GrNPs/GCE was used as an adsorbent and a working electrode in the adsorptive anodic stripping voltammetry (AdASV) for YOH detection. GrNPs/GCE can bind to YOH molecule via the pp interaction. The surface morphology and electrochemical behavior of the GrNPs/GCE was characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV) and AdASV. Under the optimized conditions, the GrNPs/GCE exhibited excellent adsorption and electrochemical detection of YOH with two linear ranges of 0.2-5.0 mu mol L-1 and 5.0-30.0 mu mol L-1, a detection limit of 0.07 mu mol L-1, and a quantitation limit of 0.25 mu mol L-1. The GrNPs/GCE provided good repeatability, with relative standard deviation (RSD) values ranging from 4.4-5.4%. This method was applied to investigate YOH contamination in beverage samples and had good recovery (96 +/- 2% to 105 +/- 2%). (c) 2019 The Electrochemical Society.