Sunflower lecithin is an important product in countries producing large amounts of sunflower oil. Due to its high phosphatidylcholine and essential fatty acid contents, it can be well utilized as an additive in food and feedstuffs. After refinement and fractionation, its utilization in food products and cosmetics can be greatly increased and further extended after appropriate modification. Utilized as an additive in the feedstuff to piglets and porklings, it results in higher bodyweight and shortened breeding and fattening periods. It is also suitable for adjusting the energy level of broiler feeds and, owing to its choline content, the use of synthetic choline chloride can be eliminated.
The thermooxidative behaviour of sunflower and rapeseed oils has been investigated by means of a derivatograph, using both dynamic and static (isothermal) temperature programs. The aim was to find the optimum experimental conditions for studying the oxidative stability of edible oils, in order to determine their storability. A novel method has been developed for the rapid indication of stability by modelling the oxidative changes under isothermal conditions.
The complex thermoanalytical investigation of oil stability has been made by means of the Derivato‐graph using dynamic and static programs. TG, DTG and DTA curves have been registered simultaneously. The aim of the experiments was to determine the optimum conditions for examination of oxidative stability and oxidation state of edible oils. Results show that the study of thermal decomposition under dynamic conditions allows the detection of thermal and oxidative degradation. Storability can be investigated under static (isothermal) conditions by modeling the oxidation processes. Oxidative changes can be followed quantitatively with thermogravi‐metry (TG) and derivative thermogravimetry (DTG) curves, while differential thermal analysis (DTA) measurements show exothermic enthalpy changes. A novel method has been developed for rapid indication of the oxidative stability using isothermal conditions.
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