To ensure edible oil quality and safety, demonstrated herein were superior hybrid magnetic nanocomposites with enhanced peroxidase-like activity that presented electrochemical detection of TBHQ in edible oil. Gold nanoparticles (AuNPs) and magnetic Fe3O4 NPs embedded in an organic framework by a simple self-assembly method treatment to fabricate Fe3O4@Au/MOF nanocomposites which were validated through various characterization techniques. At the same time, the morphology, chemical structure, and synergistic effects of metal particles were investigated. The effective combination of Fe3O4 NPs and AuNPs and Cu-MOF exhibited high electrocatalytic activity of Fe3O4@Au/MOF, promote charge transfer, and more sensing sites. Due to its enhanced peroxidase-like activity, Fe3O4@Au/MOF catalyzes H2O2 to generate oxidatively active radicals. On the basis of these results, the redox reaction of TBHQ can be further promoted and the accurate quantitative detection of TBHQ can be achieved. Results displayed Fe3O4@Au/MOF was employed for electrochemical sensing of TBHQ that exhibited low detection limit of 0.3323 µM (S/N = 3) in concentration range of 1-100 M. Moreover, the results of the electrochemical assays proposed to measure TBHQ in five common edible oil show good correlation with the actual amount added. The nanocomposite established good stability, repeatability, reproducibility and sensitivity in real samples that certifies its practical applicability in edible oil antioxidants analysis as an electrochemical sensor. Finally, social implications and future perspectives concerning this proposed method was discussed.

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