Influence of filtration aids based on cellulose on phospholipids and soaps content in sunflower oil after winterisation
2018
Romanić, Ranko (https://orcid.org/0000-0002-5329-4511) | Nedić-Grujin, Katarina | Nikolovski, Branislava (https://orcid.org/0000-0002-0753-3155) | Gvozdenović, Marija
Winterisation is a process during refining of sunflower oil that removes components which crystallize at low temperature and causes turbidity in oil. The most of those components are waxes. Waxes are predominantly in the hull and during the processing of sunflower seeds they pass into the crude oil. Waxes from the oil can be removed by classic winterisation that means crystallization of oil at low temperature and removes crystall of waxes by filter and wet winterisation that means adding diluted solution of sodium hydroxide, crystallisation at low temperature and then filtration. In this paper oils were analyzed before and after winterisation and filtration on the horisontal frame filters. During filtration they were used two types of filtration aids based on cellulose. Besides the content of waxes, the content of phospholipids and soaps remaining in oil after wet winterisation were also analyzed. In examined sunflower oils before filtration, content of waxes were 295±7 to 549±11 mg/kg, content of phospholipids (like P×25) by 12±2 to 50±5 mg/kg, and content of soaps by 49±2 to 119±3 mg/kg. After winterisation content of waxes in oils was 2.94±0.05 to 3.21±0.06 mg/kg, while the filtration was reduced and contained phospholipids (not detected to 38±4 mg/kg), as well as the content of soaps, the presence of which in any sample after filtration was not detected by the applied methodology of determining. According to the obtained results, filtration with filter aids based on cellulose has a multiple beneficial effect, because during filtration of sunflower oil in addition to the content of waxes, also reduces the content of phospholipids and the content of soaps.
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