Electrochemical behaviour of Sudan I at Fe3O4 nanoparticles modified glassy carbon electrode and its determination in food samples

► Preparation of Fe3O4 nanoparticles modified glassy carbon electrode. ► Fe3O4 nanoparticles catalyse the electrochemical oxidation of Sudan I. ► The prepared electrode determines Sudan I with high sensitivity and selectivity. ► The developed method can determine Sudan I in chilli powder and ketchup.