เซนเซอร์ทางเคมีไฟฟ้าสำหรับตรวจวัดสารโยฮิมไบน์

Abstract

A simple electrochemical sensor to detect yohimbine (YOH) was developed based on graphene nanoplatelets (GrNPs) modified glassy carbon electrode (GrNPs/GCE). GrNPs/GCE was used as a working electrode and an adsorbent in the adsorptive anodic stripping voltammetry (AdASV) for YOH detection. Due to GrNPs/GCE can interacted with YOH molecule via the π-π interaction so GrNPs/GCE can improve the sensitivity of this sensor. The morphology and electrochemical behavior of the GrNPs/GCE was characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV). Under the optimized conditions, the GrNPs/GCE exhibited excellent adsorption and electrochemical detection of YOH with two linear ranges of 0.2 - 5.0 μmol L-1 and 5.0 - 30.0 μmol L-1, a detection limit of 0.07 μmol L-1, and a quantitation limit of 0.25 μmol L1. 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%).