Shao Wenyao, Pan Xueshan, Liu Xiaoting, Teng Feixue, Yuan Shuai
Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 Fujian, PR China.
Food Technol Biotechnol. 2018 Mar;56(1):65-70. doi: 10.17113/ftb.56.01.18.5452.
This work aims at developing a process of microencapsulation of algal oil containing ≥40% docosahexaenoic acid (DHA) using spray drying technology. Purity Gum® 2000 and Capsul®, both obtained from waxy corn starch, were chosen as the encapsulation materials. The effects of emulsification conditions on the droplet size, stability, viscosity and surface tension, and the effects of spraying conditions on the particle size, moisture content and surface oil content were investigated successively. The morphology of emulsion droplets and the microcapsules was observed by optical microscope and scanning electron microscopy. The results showed that the produced spherical microcapsules were smooth and free of pores, cracks, and surface indentation when shear velocity was 8.63 m/s in the first step of emulsification, homogenization pressure was 1.75·10 Pa and number of passes through homogenization unit was six for fine emulsification, rotational speed of spray disk was 400 s, and air inlet temperature was 170 °C. Therefore, it was concluded that the emulsification and encapsulation of algal oil containing DHA with above process was feasible.
本研究旨在利用喷雾干燥技术开发一种微胶囊化工艺，用于包封二十二碳六烯酸（DHA）含量≥40%的藻油。选用均由糯玉米淀粉制得的Purity Gum® 2000和Capsul®作为包封材料。依次考察了乳化条件对液滴尺寸、稳定性、黏度和表面张力的影响，以及喷雾条件对粒径、水分含量和表面油含量的影响。通过光学显微镜和扫描电子显微镜观察乳液滴和微胶囊的形态。结果表明，当乳化第一步的剪切速度为8.63 m/s、均质压力为1.75·10 Pa、通过均质单元进行精细乳化的次数为6次、喷雾盘转速为400 s以及进风温度为170 °C时，所制备的球形微胶囊表面光滑，无孔隙、裂纹和表面凹陷。因此，得出结论：采用上述工艺对含DHA的藻油进行乳化和包封是可行的。
