Thermo-induced lipid oxidation of a culinary oil: The effect of materials used in common food processing on the evolution of oxidised species

► Peanut oil was thermally stressed in the presence of materials used for food processing. ► Copper was found to deeply accelerate the buildup of secondary oxidation products. ► EPR spectroscopy was employed to investigate the nature of dissolved Cu(II) ions. ► DFT calculations were used to support possible structures of Cu(II) oxo complexes.