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A multiple‐variable approach to study corn oil oxidation
Author(s) -
ToroVazquez J. F.,
CastilloM A. A.,
HernándezC R.
Publication year - 1993
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02545306
Subject(s) - decomposition , peroxide , chemistry , citric acid , reaction rate constant , antioxidant , nuclear chemistry , organic chemistry , kinetics , physics , quantum mechanics
The induction time for oxidation (Γ i ) and the rate constant for bimolecular peroxide decomposition (k 2 ) 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. Γ i in both CW and CWO was mainly described (R 2 > 0.93) through linear and quadratic interactions between the temperature (T°) and the initial peroxide concentration. Although the antioxidant increased Γ i , carbonyls were produced in earlier stages ( i.e., <Γ i ) and lower T° than in CWO. These carbonyls were produced through a bimolecular peroxide decomposition. The equations for k 2 (R 2 > 0.96) indicated a faster decomposition of peroxide in CWO than in CW; nevertheless, as a function of T°, k 2 increased at a slower rate in CWO than in CW.