Ultrasensitive detection of kanamycin in animal derived foods by label-free electrochemical immunosensor

► A simple label-free electrochemical immunosensor was fabricated for rapid detection of kanamycin. ► Graphene sheets employed can do good help to the performance of the immunosensor. ► The electroactivity of TH was greatly improved due to the synergistic effects. ► The developed immunosensor exhibited good selectivity and stability.