Microencapsulation of Flaxseed Oil Using Spirulina as Main Wall Material

Abstract:

The microencapsulation of flaxseed oil using spirulina as main wall material was prepared by spray drying. The effects of spray drying process parameters and formula on the microencapsulated powders were investigated in this study. Gelatin and maltodextrin were selected as the supplementary wall materials. The characteristics of the powders were studied. The optimum technological parameters for microencapsulation of flaxseed oil using spirulina by spray drying were as follows：3 bar of air pressure，4.3 m/s of fan speed，190 ℃ of inter temperature，900 mL/h of feed speed，10% of feed concentration，and 1∶3 of the weight ratio of core material to wall material. The microencapsulation efficiency was thus improved to 48.85 %. The compound wall materials provided higher microencapsulation efficiency compared with the single wall material. The microencapsulation efficiency increased to over 75% with 5% spirulina，10% gelatin and 5% maltodextrin. The results indicated that the powders encapsulated by spirulina possessed small particle size and smooth surface with the average particle diameter of 7.20 ?滋m. Moreover，the oxidation resistance of microcapsules was increased by 47.7%，comparing with commercially available spirulina powders. Flaxseed oil microencapsulated by compound wall materials of spirulina，gelatin and maltodextrin had good thermal stability and storage stability. The microencapsulation retention reached to 82.96% when temperature increased from 40 ℃ to 200 ℃. The lipid oxidation of flaxseed oil could be effectively prevented by compound wall materials，which showed a higher retention rate of 80% for core material after 30 days storage at room temperature.