| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1184275 | Food Chemistry | 2013 | 6 Pages |
The antioxidative effect of sitosterol at 1, 2 and 5% levels, in triolein, refined canola, high oleic sunflower and flaxseed oils, continuously heated for a period of up to 72 h at frying temperature of 180 °C, was studied. High Pressure Size Exclusion Chromatography (HPSEC) was used to monitor changes in peak areas of triacylglycerol (TG) polymer, monomer and ester hydrolysis products. The presence of enhanced levels of sitosterol was found to significantly decrease TG polymer formation in triolein and the vegetable oil samples after heating at 180 °C for a period of 72 h. A corresponding increase in the level of intact TG monomer and the extent of TG ester hydrolysis was observed in all samples with enhanced levels of sitosterol. Conversion of sterol to steradiene, by the 1, 2 elimination of water, may be responsible for the antioxidative effect of sitosterol at frying temperatures.
► Higher level of sitosterol was found to limit polymerization in frying oils. ► A corresponding increase in the extent of TG ester hydrolysis was observed. ► Conjugation in steradienes may be responsible for the antioxidative effect. ► Atmospheric moisture may catalyze the conversion of sterol to steradiene. ► Sitosterol was found was more potent than sitostanol in limiting TG polymerization.
