By Afaf Kamal-Eldin, Jan Pokorny
Lipid oxidation, even though researched because the starting of the 20 th century, nonetheless provides no whole and passable details at the composition of oxidized lipids. One very important issue contributing to those gaps in our wisdom approximately lipid oxidation pertains to the shortages in analytical technique. Analytical equipment compatible for oxidized lipids have been usually reviewed within the final decade, yet often from the element of choice of person oxidized lipid periods, similar to peroxides, aldehydes, polar lipids, or polymers. during this ebook, they're handled from the perspective of varieties of analytical equipment used, together with assorted volumetric tools, UV-visible spectrometric equipment, excessive functionality size-exclusion chromatography, nuclear magnetic resonance spectroscopy, electron spin resonance spectroscopy, and differential scanning calorimetry. research of Lipid Oxidation is key for extra advancements in analytical method and hyphenated thoughts, with which extra realizing of the response kinetics, mechanism, and implications will ensue.
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The first compounds formed in the autoxidation of unsaturated lipids, which proceeds via a free radical mechanism, are hydroperoxides; further oxidation, decomposition, and polymerization reactions result in a complex mixture of volatile and nonvolatile oxidation compounds of different polarity and MW. Although volatile compounds are of extraordinary importance for sensory properties and consumer acceptance, nonvolatile products are by far the most abundant and nutritionally relevant compounds because they are retained in food and hence are part of the diet.
It follows from these results that nonvolatile precursors other than acetals exist in oxidized lipids. The reactivities of different carbonyl compounds and different TBA derivatives were tested, and the results published in a long series of papers reviewed in detail by Guillén Sans and Guzmán Chozas (1988). The reaction products of different carbonyl compounds with TBA were more complicated than the earlier researchers had anticipated; therefore, the reactivity of other lipid oxidation products was studied.