Changes in the Composition of Tocopherols and Fatty Acids in Postdeodorisation Condensates during Refining of Various Oils

For refining of different plant oils the same industrial installations are used and the last stage is the process of deodorisation. The waste product obtained during the deodorisation process is the postdeodorisation condensate (oil scum). Oil scum contains several valuable components, such as polyunsaturated free fatty acids and tocopherols. Qualitative and quantitative composition of tocochromanols and free fatty acids depend on the kind of the refined oil. Postdeodorisation condensates from the refining of rape, sunflower and soybean oils were investigated. Prevailing acid in all postdeodorisation condensates was the oleic acid the quantity of which ranged from 50% to 58.7%. Second was the linoleic acid, which was found in quantity amounting to 20% during the refining of rape and soybean oils, but in the condensate coming from sunflower oil its content was by 10% greater. The results obtained during quantitative determination of tocochromanols correlated with their quantity in oils, but we observed greater distillation of γ-T and α-T than of δ-T. The reason for this is smaller quantity of δ-T in the oil which is undergoing the process of deodorisation.