By Afaf Kamal-Eldin, David Min
Autoxidation of unsaturated lipids has bought a lot awareness since it has many purposes within the rancidity of meals and balance of lipids in organic tissues and booths. This ebook experiences state of the art advancements within the realizing of the oxidation of lipids and its reference to the oxidation of alternative organic molecules reminiscent of proteins and starch. many of the chapters illustrate the designated good points linked to various lipids, antioxidants, response stipulations, and lipids environments. the fabric during this publication presents a greater knowing of lipid oxidation pathways.
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Example text
2001a), most likely through hydrogen donation to both peroxyl and alkoxyl radicals. Hydrogen donation inhibits β-scission of alkoxyl radicals, and the addition of α-TOH to methyl linoleate hydroperoxides was found to reduce the formation of hexanal in a concentration-dependent manner (Hopia et al. 1996). Accordingly, it is likely that the formation of C3-aldehydes in fish oil, also products of β-scission of alkoxyl radicals, is inhibited by increased stabilization of the hydroperoxides and by scavenging of alkoxyl radicals.
Chem. Soc. Jpn. 57, 3177–3181. G. (2002) Kinetic Study of the Antioxidant Activity of α- and γ-Tocopherols in Sunflower and Soybean Triacylglycerols, Eur. J. Lipid Sci. Technol. 104, 262–270. V. M. (1992) Inhibited Oxidation of Lipids. I. Complex Estimation and Comparison of the Antioxidative Properties of Some Natural and Synthetic Antioxidants, Fat Sci. Technol. 94, 374–379. , and Ukegawa, K. (1998) Mechanism of Lower Oxidizability of Eicosapentaenoate than Linoleate in Aqueous Micelles. II. Effect of Antioxidants, Lipids 33, 597–600.
Hydroperoxy epidioxides, in fact, represented as much as 25% of the total hydroperoxides found in autoxidized methyl linolenate (Neff et al. 1981), and their formation is expected to be a major reaction pathway for EPA and DHA also. Hydroperoxy bicycloendoperoxides, also formed through intramolecular radical addition, comprise another group of oxidation products characteristic of PUFA with three or more methylene-interrupted double bonds. Fatty acid monohydroperoxides decompose through the formation of peroxyl and alkoxyl radicals, and cleavage of the alkoxyl radicals by homolytic β-scission, generating shorter-chain secondary oxidation products.