Microencapsulation of Algal Oil Using Spray Drying Technology

Wenyao Shao*small orcid_display_4pp, Xueshan Pan
small orcid_display_4pp, Xiaoting Liusmall orcid_display_4pp, Feixue Tengsmall orcid_display_4pp and Shuai Yuansmall orcid_display_4pp

Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 Fujian, PR China

Article history:
Received: July 30, 2017
Accepted: January 25, 2018

Key words:
microencapsulation, docosahexaenoic acid (DHA), algal oil, spray drying, emulsification, morphology of DHA microcapsule

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 1.75·108 Pa and number of passes through homogenization unit was six for fine emulsification, rotational speed of spray disk was 400 s-1, 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.

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Paper was presented at the 7th International Forum on Industrial Bioprocessing - IFIBiop 2017, May 21-24, 2017, Wuxi, PR China