Although the chemical reactions provoked by thermal treatment
are complex, they interact with and affect each other. Exposure to
oxygen at high temperatures leads to oxidation of triacylglycerides,
which generates hydroperoxides. Hydroperoxides are unstable
intermediates and rapidly break down into reactive free radicals
to initiate autoxidation, generally through a three-phase process
(initiation, propagation and termination). Autoxidation is therefore
suggested to be a principal mechanism of lipid peroxidation. The
extreme heat during frying is the main initiator for autoxidation, in
addition to other factors such as photonic agents, ionizing radiation,
free radicals and chemical impacts. The initiation phase involves
homolytic cleavage of hydrogen bonds, particularly those in the
Although the chemical reactions provoked by thermal treatmentare complex, they interact with and affect each other. Exposure tooxygen at high temperatures leads to oxidation of triacylglycerides,which generates hydroperoxides. Hydroperoxides are unstableintermediates and rapidly break down into reactive free radicalsto initiate autoxidation, generally through a three-phase process(initiation, propagation and termination). Autoxidation is thereforesuggested to be a principal mechanism of lipid peroxidation. Theextreme heat during frying is the main initiator for autoxidation, inaddition to other factors such as photonic agents, ionizing radiation,free radicals and chemical impacts. The initiation phase involveshomolytic cleavage of hydrogen bonds, particularly those in the
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