engleski

The effect of processing conditions on the nonacylglycerol constituents of sunflower oil

In this study the samples of sunflower oil from single refining steps and samples of cold pressed sunflower oil were investigated. The content and composition of carotenes, sterols, chlorophylls and of unsaponifiable fractions was determined using spectrophotometric and different chromatographic methods (gas chromatography, thin layer chromatography, column chromatography). To obtain the data about the acidity and oxydative status of the oil samples, basic oil analysis (FFA, PV, spectrophotometric analyses in UV area) were performed. The results showed that predominating carotene in sunflower oil is lutein, and that the total amount of carotenes during refining process was reduced for 80-90 %. The major sterol in sunflower oil, as well as in other vegetable oils, is ß-sitosterol (about 70%). The other important sterols in sunflower oil are: D7-stigmastanol, stigmasterol, campesterol, D5-avenasterol and D7-avenasterol. The composition of sterols in nonrefined and refined oil samples was more or less the same, while the content of sterols during refining process decreased for 30 - 40 %.

cold pressing; rafination; sunflower oil; unsaponifiable fractions

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