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Oxidation process of oils with high content of linoleic acyl groups and formation of toxic hydroperoxy‐ and hydroxyalkenals. A study by 1 H nuclear magnetic resonance

2005; Wiley; Volume: 85; Issue: 14 Linguagem: Inglês

10.1002/jsfa.2273

1097-0010

Marı́a D. Guillén, Ainhoa Ruiz‐Aracama,

Antioxidant Activity and Oxidative Stress

Abstract The oxidation process of sunflower and corn oils at 70 °C with circulating air has been studied by means of 1 H nuclear magnetic resonance (NMR). The changes produced in the two oils are compared not only in relation to the rate of degradation of acyl groups but also with reference to both the rate of formation and degradation of primary oxidation products as well as the rate of formation of secondary oxidation products such as aldehydes. Special attention is paid to the evolution of the different kinds of aldehydes formed throughout the process. The great ability of these oils to produce geno‐ and cytotoxic aldehydes under the above conditions is proved. Moreover, peroxide and anisidine values of corn oil throughout its oxidation process have also been determined and the results obtained have been compared with those provided by the 1 H NMR spectra, showing good agreement. Copyright © 2005 Society of Chemical Industry