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On the kinetics of the autoxidation of fats: substrates with conjugated double bonds
Author(s) -
Brimberg Ulla I.,
KamalEldin Afaf
Publication year - 2003
Publication title -
european journal of lipid science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 94
eISSN - 1438-9312
pISSN - 1438-7697
DOI - 10.1002/ejlt.200390000
Subject(s) - autoxidation , conjugated system , chemistry , double bond , conjugated linoleic acid , kinetics , polymerization , monomer , organic chemistry , micelle , photochemistry , linoleic acid , polymer , fatty acid , physics , quantum mechanics , aqueous solution
This paper provides a kinetic evaluation of rate data on the oxidation of conjugated linoleic acid methyl esters published by Kern et al. almost 50 years ago. The results of the kinetic analysis suggest that the oxidation of pure substrates with conjugated double bonds in bulk starts with carbon‐oxygen cross‐linking causing oligomerization (degree of polymerization ≈3). The reaction then proceeds with simultaneous oligomerization and formation of monomeric cyclic peroxides. The oligomerization was described by the empirical equation used previously for oleate and linoleate, which was modified by adding a power term. In contrast to the case of linoleate, hydroperoxides are only minor products in the oxidation of methyl‐conjugated linoleate suggesting that micelle formation does not play a significant role in this oxidation.