Key Findings:
The effect of the size of oil droplets on the oxidative stability of flaxseed oil in spray-dried powder form was investigated in the formation of emulsified powders. The surface oil ratios of the powders with small oil droplets (0.046–0.049) were significantly lower than those with large oil droplets (0.148). The oil droplet size had a significant effect on the surface oil ratio of the powders. Oxidative stability tests showed that the powders containing larger oil droplets have a higher surface oil content, higher PV, and higher conductivity. Oil droplet size significantly affected the oxidation stability of flaxseed oil in spray-dried powder.
ABSTRACT:
The effect of the size of oil droplets on the oxidative stability of flaxseed oil in spray-dried powders was investigated. Maltodextrin with a dextrose equivalent of 25 was used as a wall material, and sodium caseinate and transglutaminase-polymerized sodium caseinate were used as emulsifiers. The oxidative stability of flaxseed oil encapsulated in the spray-dried powders was evaluated using lipid oxidation and conductometric determination tests at 105 °C. The powders containing larger oil droplets exhibited higher surface oil content after spray drying, and higher peroxide value and conductivity after storage at 105 °C. Removal of the surface oil from the powders by washing with hexane significantly decreased the conductivity. The results indicated that the surface oil of the spray-dried flaxseed oil powders affected the oxidation stability.
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