Oxidative stability of sunflower oil bodies

This study investigates the oxidative stability of sunflower oil body suspensions (10 wt-%o lipid). Two washed suspensions of oil bodies were evaluated over 8 days at three temperatures (5, 25 and 45 degrees C) against three comparable sunflower oil emulsions stabilized with dodecyltrimethylammonium bromide (DTAB), polyoxyethylene-sorbitan monolaurate (Tween 20) and sodium dodecyl sulfate (SIDS) (17 mM). The development of oxidation was monitored by measuring the presence of lipid hydroperoxides and the formation of hexanal. Lipid hydroperoxide concentrations in die DTAB, SIDS and Tween 20 emulsions were consistently higher than in the oil body Suspensions; furthermore, hexanal formation was not detected in the oil body emulsions, whereas hexanal was present in the headspace of the formulated emulsions. The reasons for the extended resistance to oxidation of the oil body Suspensions are hypothesized to be clue to the presence of residual seed proteins in the continuous phase and the presence of a strongly stabilized lipid-water interface.