Smart electrochemical determination of food additive (Propyl gallate) in edible oil and chicken samples based on CoSe2@FeS2 nanocomposite modified laser induced graphene electrode.

• CoSe 2 @FeS 2 nanocomposite was successfully synthesised. • A sensitive smart electrochemical detection of propyl gallate based on laser induced graphene is developed. • The proposed sensor exhibits a low limit of detection of 0.018 µM. • The practicality of the fabricated sensor was investigated using oil and chicken sample. The overuse of synthetic phenolic antioxidants has negative health impacts on individuals. Several sensors have been developed to detect and monitor the level of these substances, frequently necessitating labour-intensive procedures and lengthy processes. Here, a simple and cost-effective electrode based on CoSe 2 and FeS 2 nanoparticles which could be actuated by a smart portable device has been developed. CoSe 2 nanocorals and FeS 2 nanosheets were successfully synthesised through hydrothermal technique and mechanically hybridized. The prepared CoSe 2 @FeS 2 nanocomposite was used to modify the glassy carbon electrode (GCE), and the modified electrode was deployed to sense propyl gallate (PG). The electrochemical characteristics of the fabricated sensor were then studied through cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The sensor resulted in a current response that covered a broad linear range from 0.05 μM to 200 μM and had a low detection limit (LOD) of 0.018 μM and a limit of quantification (LOQ) of 0.064 μM with outstanding performance. The designed electrode material was then used to modify the laser-induced graphene electrode (LIGE) and employed to evaluate its practical applicability. The findings exhibited efficient detection with commendable recovery rates thus the designed electrode could be a game changer in the portable-smart sensing of propyl gallate. [Display omitted] [ABSTRACT FROM AUTHOR]