Monitoring of minor compounds in corn oil oxidation by direct immersion-solid phase microextraction-gas chromatography/mass spectrometry. New oil oxidation markers

The aim of this study is to shed light on the evolution of the minor compounds in the corn oil oxidation process, through the information provided by direct immersion-microextraction in solid phase followed by gas chromatography/mass spectrometry (DI-SPME-GC/MS). This methodology enables one, in a single run, to establish the identity and abundance both of original oil minor components, some with antioxidant capacity, and of other compounds coming from both main and minor oil components oxidation. For the first time, some of the compounds formed from oil minor components degradation are proposed as new markers of oil incipient oxidation. Although the study refers to corn oil, the methodology can be applied to any other edible oil and constitutes a new approach to characterizing the oxidation state of edible oils. This work has been funded by the Spanish Ministry of Economy and Competitiveness (MINECO, AGL2015-65450-R) and by the Basque Government and its Departments of Universities and Research (EJ-GV, IT-916-16) and of Economic Development and Infrastructures, Area of Agriculture, Fisheries and Food Policy (EJ-GV, PA19/02). J. Alberdi-Cedeno thanks the EJ-GV for a predoctoral grant.