Phosphorylated acylglycerols and their sdts containing nitrogen inhibit the autoxidation of rapeseed, soybean, sunflowerseed, and hydrogenated rapeseed oils, similarly as natural soybean or rapeseed phospholipid concentrates (lecithins). The activity is moderate at low concentration levels (0.02-0.10 %) but well pronounced at higher levels (0.5-2.0 %), the protection factor being proportional to the concentration of phospholipids. Ammonium salts are more active than Iysine and arginine salts which are more active than free phosphatidic acids. Zinc salts have only very low activity, and calcium and sodium salts are inefficient. The activity depends on the quality of oils, and in lesser degree, on the composition of phospholipids.
The reaction of ethyl linoleate with collagen proceeded at 60 degrees C following the first order kinetics but during the hydroperoxide decomposition the rate constant of the first order decomposition was substantially lower than that of the second order decomposition. Contrary to cellulose, collagen catalyzed the hydroperoxide decomposition. The amount of total oxidation products rose rapidly at the stage of rapid hydroperoxide formation, and slowly afterwards. The browning reaction was fasted in the stage of maximum hydroperoxide content, and both ether-insoluble and ether-soluble pigments were formed, the latter low in nitrogen. The amount of lipid oligomers increased mainly in the reaction stage following the hydroperoxide maximum. Soluble collagen was converted into insoluble forms by the reaction with oxidized lipids. Basic amino acids were blocked by reaction with oxidized lipids but the bonds formed became resistant to acid hydrolysis only in the stage following the hydroperoxide maximum. Changes of sensory profiles could be explained by reactions of flavour-active carbonylic oxidation products with protein.
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