Reduced graphene oxide-dysprosium molybdate modified electrode for selective and sensitive detection of histamine

Histamine (HM) is a low-molecular weight biogenic amine that is produced during food spoilage and is a health threat at high levels. In this work, a reduced graphene oxide–dysprosium molybdate nanocomposite modified glassy carbon electrode (rGO-DysM@GCE) for the sensitive detection of HM at a low oxidation potential is reported. The synergy between rGO and catalytically active DysM leads to better electron-transfer kinetics as well as higher numbers of electroactive sites, leading to better electrocatalytic performance. PXRD, XPS, FT-IR, FE-SEM and HR-TEM were used for the characterization of the nanocomposite. The sensor had a low detection limit of 11.2 nM, a wide linear range of 0.02–0.55 μM, and excellent selectivity, reproducibility, repeatability, and storage stability. The results obtained in the spiked fish samples yielded a recovery value of 96.5–98.0%, which suggests that the proposed sensor could be used practically for monitoring and analysing the quality of fish foods.