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This article developed a novel electrochemical immunosensor for the specific detection of aflatoxin B1 (AFB1). Amino‐functionalized iron oxide nanoparticles (Fe3O4‐NH2) were synthesized. Fe3O4‐NH2 were chemically bound on self‐assembly monolayers (SAMs) of mercaptobenzoic acid (MBA). Finally, polyclonal antibodies (pAb) were immobilized on Fe3O4‐NH2‐MBA. The sensor system was evaluated through atomic...