A novel electrochemical sensor based on cerium-cobalt bimetal organic framework ultrathin nanosheets for propyl gallate detection in edible oils

Propyl gallate (PG), a commonly used oil-soluble antioxidant, exhibits remarkable antioxidative properties, so it is extensively employed in vegetable oils, lard, poultry fats and oil-rich food products. However, prolonged excessive consumption of PG may pose health risks to humans such as kidney damage or contact dermatitis. Herein, a novel economically sensitive sensor for PG was constructed based on cerium-cobalt bimetallic organic framework (CeCo-BMOF) materials. The morphology and composition of the materials were characterized by scanning electron microscope (SEM), element mapping, X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS), and Raman spectrum (RS). The construction process of the sensor was characterized by electrochemical impedance spectroscopy (EIS), chronocoulometry method (Q-t1/2) and cyclic voltammetry (CV). The sensor not only demonstrates a wide linear range (1.5 μM – 17.6 μM and 11.5 μM – 458 μM) and a low limit of detection (LOD = 0.49 μM; S/N = 3) for the determination of PG, but also exhibits excellent anti-interference capability, stability, and repeatability. Above all, the recommended method can be successfully employed for the detection of PG in peanut oil and corn oil.