A multiple-variable approach to study corn oil oxidation Article uri icon

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%25, citric acid 0.0012%25), 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. © 1993 The American Oil Chemists%27 Society.
  • 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%25, citric acid 0.0012%25), 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. © 1993 The American Oil Chemists' Society.

publication date

  • 1993-01-01