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2025 AOCS Annual Meeting & Expo.

Lipid Oxidation and Quality

Analytical

Novel Methods to Measure Lipid Oxidation and Antioxidant Activity

Comprehensive mapping and predictive modelling of vegetable oil oxidation products by NMR-based oxylipidomics

Tuesday, April 29, 2025
10:35 AM – 10:55 AM PST
Room: B116
Abstract:

Lipid oxidation is one of the major causes of vegetable oil deterioration. Developing solutions to prevent oxidation currently relies on cumbersome empirical testing to assess the shelf-life. Besides, advancements in mechanistic understanding are hindered by the lack of high-throughput analytical methods that can simultaneously quantify a broad range of primary and secondary oxidation product classes. In this study, we developed an NMR-based ‘oxylipidomics’ platform using 1D and 2D approaches that allow the quantification of hydroperoxides, epoxides, aldehydes, ketones and hydroxides generated during lipid oxidation. The data obtained were subsequently used to develop a predictive model that accounts for environmental (oxygen pressure, headspace to oil ratio, temperature) and compositional (fatty acid composition, antioxidants, metal concentration) parameters. A kinetic reaction network was constructed and parametrized by estimating activation energies of the key oxidation reactions for triolein, trilinolein, and trilinolenin. When applied to vegetable oils, the predictions obtained with the model were aligned with the experimental data. In the future, such model can enable in silico shelf-life predictions for the ranking of antioxidant efficacy or for unravelling antioxidant mechanisms.