A versatile method to fingerprint and compare the oxidative behaviour of lipids beyond their oxidative stability

Year: 2023

Authors: Pizzimenti S., Bernazzani L., Duce C., Tini MR., Bonaduce I.

Autors Affiliation: Univ Pisa, Dept Chem & Ind Chem, Via Giuseppe Moruzzi 13, I-56124 Pisa, Italy; Ist Nazl Ott INO SS Pisa, CNR area Pisa, Via Moruzzi 1, I-56124 Pisa, Italy.

Abstract: In this work we propose the use of isothermal thermogravimetry to evaluate the oxidative stability of a lipid and to evaluate how the glyceride composition affects the entire oxidative process, to quantify the oxidation undertaken by the lipid, and numerically compare the oxidative behaviour of different lipids. The innovative aspect of the present method lies in the acquisition of a prolonged oxygen uptake curve (4000-10,000 min) of a lipid under oxygen and in the development of a semi-empirical fitting equation for the experimental data. This provides the induction period (oxidative stability), and allows to evaluate the rate of oxidation, the rate and the magnitude of oxidative degradation, the overall mass loss and the mass of oxygen taken by the lipid upon time. The proposed approach is used to characterize the oxidation of different edible oils with different degrees of unsaturation (linseed oil, sunflower oil, and olive oil) as well as chemically simpler compounds used in the literature to model the autoxidation of vegetable oils and lipids in general: triglycerides (glyceryl trilinolenate, glyceryl trilinoleate and glyceryl trioleate) and methyl esters (methyl linoleate and methyl linolenate). The approach proves very robust and very sensitive to changes in the sample composition.

Journal/Review: SCIENTIFIC REPORTS

Volume: 13 (1)      Pages from: 8094-1  to: 8094-11

More Information: The authors kindly acknowledged Ester Scaiella for the experimental support and Rita Carosi and Elena Pulidori for the technical support during TG analyses. The study was performed as a part of the University of Pisa project PRA_2022_58 – Microwave assisted approaches for heritage science, environment, and energy.
KeyWords: Differential Scanning Calorimetry; Unsaturated Fatty-acids; Thermal-decomposition; Vegetable-oils; Linoleate Monohydroperoxides; Photosensitized Oxidation; Esters; Autoxidation; Degradation; Kinetics
DOI: 10.1038/s41598-023-34599-6

Citations: 5
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