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Influence of emulsion composition and spray-drying conditions on microencapsulation of tilapia oil
Hui Huang1, Shuxian Hao1, Laihao Li1
1South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of Aquatic Products Processing of Ministry of Agriculture, National R&D Center For Aquatic Product Processing, 231 Xingangxi Road, Haizhu District, Guangzhou, 510300 China.
Abstract:
The influence of processing conditions on the microencapsulation of tilapia oil by spray drying was studied. Trehalose, gelatin, sucrose and xanthan were used as emulsion composition. The experimental parameters of spray drying such as inlet air temperature, solid content, drying air flow rate and atomizing pressure were optimized using a central composite design. Encapsulation efficiency and lipid oxidation were determined. Bulk density, powder morphology and particle size were also analyzed. Trehalose improved the glass transition temperature of wall material significantly and prevented the oxidation of the fish oil. Encapsulation efficiency reached a maximum of 90 % under optimum conditions with an inlet air temperature of 121 °C, a drying air flow rate of 0.65 m(3)/min and a spray pressure of 100 kPa.
