Development of antioxidant microencapsulated seed oil containing natural plant extracts by response surface methodology

Abstract

Lipids in seed oils are used as important functional components of foods. They roles as a main nutrition in foods and have a significant effect on the quality of foods and contribute to flavor, odor, color and texture. The major problem in these lipids in oils lies in oxidation during storage as a time course or food processing with heat treatment which can lead to the rancidity and defective nutrition due to degradation products such as hydroperoxides, resulting in harmful effects on human health. Many investigations to solve this oxidative deterioration of lipids have been executed by using synthetic or natural antioxidants and many commercial antioxidant products have been developed. However, most antioxidant studies have been concentrated on seed oils with liquid type and there have been few studies regarding processed seed oils such as spray-drying microencapsulated seed oils to prevent lipid oxidation of residual free fat on the surface of microcapsules. Thus, the effect of natural plant extracts such as rosemary, broccoli sprout, and citrus as natural antioxidants on the oxidation of spray-drying microencapsulated seed oil was studied to prevent lipid oxidation of the microcapsule. The optimization of microencapsulation of seed oil to maximize microencapsulation efficiency was performed by response surface methodology to use dextrin as a substituted coating wall of milk protein. Although high oleic sunflower oil could be stable in lipid oxidation as it was developed and commercially produced for lipid oxidative stability by substituting large amount of linoleic acid with oxidatively stable oleic acid, vulnerable lipid oxidation could occur when it was processed as spray-drying microencapsulated. Formation of the hydroperoxides, primary oxidative products, could be inhibited effectively by natural plant extracts such as rosemary, broccoli sprout, and citrus mixture. The antioxidant ability of the natural plant extracts was more effective when it was used ...