Autooxidation of Unsaturated Fatty Acids and Their Esters |
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Authors: | Litwinienko G |
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Institution: | (1) Department of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland |
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Abstract: | The shape of DSC curves of non-isothermal oxidation of fats was explained. Two main exothermic effects overlapped partially
are caused by hydroperoxide formation (first peak) and by further oxidation of peroxides (second peak). The oxidation of oils
and lipid analogues of various peroxide concentration showed that only the start of the oxidation process is affected by initial
concentration of peroxides, other temperatures determined from DSC curves are not connected with this parameter. The computer
simulations gave the best agreement of theoretical and experimental data for kinetic scheme of a two-step consecutive reaction
with autocatalytic start. The comparison of activation energies calculated for isothermal and non-isothermal autooxidation
of unsaturated fatty acids and their esters also confirmed this interpretation.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | autooxidation DSC fatty acids lipids oxidative stability |
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