Abstract
The induction time for oxidation (Γi) and the rate constant for bimolecular peroxide decomposition (k2) were determined in refined corn oil with (CW) and without (CWO) antioxidant (ter-butil hydroxy-quinolein 0.0014%, citric acid 0.0012%), and their magnitude and variability were described through multiple regression. Γi in both CW and CWO was mainly described (R2 > 0.93) through linear and quadratic interactions between the temperature (T°) and the initial peroxide concentration. Although the antioxidant increased Γi, carbonyls were produced in earlier stages (i.e., <Γi) and lower T° than in CWO. These carbonyls were produced through a bimolecular peroxide decomposition. The equations for k2 (R2 > 0.96) indicated a faster decomposition of peroxide in CWO than in CW; nevertheless, as a function of T°, k2 increased at a slower rate in CWO than in CW.
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Toro-Vazquez, J.F., Castillo-M, A.A. & Hernández-C, R. A multiple-variable approach to study corn oil oxidation. J Am Oil Chem Soc 70, 261–267 (1993). https://doi.org/10.1007/BF02545306
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DOI: https://doi.org/10.1007/BF02545306