Investigation of the oxidative stability of cold pressed sunflower oil of high-oleic type subjected to elevated temperature / Ispitivanje oksidativne stabilnosti hladno presovanog ulja suncokreta visokooleinskog tipa pri povišenoj temperaturi
2017
Romanić, Ranko S. (Tehnološki fakultet, Novi Sad (Srbija)) | Kravić, Snežana Z. (Tehnološki fakultet, Novi Sad (Srbija))
In this paper the oxidative stability of cold pressed sunflower oil of high-oleic type was investigated, using Schaal–Oven test at elevated temperature (63±2 °C). At the same time samples of linoleic type oils, cold pressed and refined, were tested. The extent of oxidative changes was analyzed regarding the content of primary and secondary oxidation products during the period of 14 days. To espe- cially expressed increase in oxidative values, with very high values of the coef- ficient of determination occurred in samples of linoleic type of oils, cold pressed and refined, whereas these changes were much less observed in the sample of cold pressed sunflower oil of high-oleic type (R2 ≥ 0.99). The cold pressed oils of high-oleic and linoleic type, as well of refined sunflower oil of linoleic type were measured and the content of conjugated dienes and conjugated trienes. In the period of 14 days, the lowest increase in oxidative value and the lowest degree of conjugation into the conjugated diene and triene were determined in cold pres- sed sunflower oil of high-oleic type, indicating a significantly better oxidative stab- ility of this type of oil compared to linoleic types.
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