Fabrication of an Electrochemical Sensor Based on Silver Nanoparticles Stabilized by Phoenix dactylifera Seed Oils for the Determination of Ornidazole in Milk Samples

Abstract

AbstractIn this study, silver nanoparticles (Ag‐NPs) were synthesized using AgNO3 through a simple route using bio‐oil obtained from flash pyrolysis of Phoenix dactylifera seed powder as reducing as well as capping agent. The acquired bio‐oil was characterized by FT‐IR and GC–mass spectrometry. Besides, the main objective of this study is to construct a highly sensitive sensor to detect ornidazole (ODZ) in real samples. The sensor was elaborated by using carbon paste electrode modified with the synthesized Ag‐NPs (Ag‐NPs /CPE). The synthesized Ag‐NPs were characterized by scanning electron microscopy (SEM), X‐ray diffraction (XRD) and UV‐Visible (UV‐vis). The resulting sensor demonstrates a significant shift in ODZ reduction peak toward more positive potential (−0.257 V .vs Ag/AgCl) compared to the unmodified CPE (−0.561 V .vs Ag/AgCl). The ODZ peak reduction current Ipc varies linearly with ODZ concentration in the range of 8.0×10−6 to 1.0×10−3 mol L−1 with a detection limit of 9.76×10−7 mol L−1. The proposed method has been successfully used to determine ODZ in milk sample with satisfactory results.