Abstract: The microencapsulation was prepared with sodium alginate and chitosan as wall materials and self-made fish oil as core by complex coacervation.Using surface structure,yield,effciency and release property as evaluating guidelines,the optimum wall compositions and processing for fish oil microencapsulation made by complex coacervation were systematically obtained. Results showed that the optimum conditions of microencapsulating fish oil were:ratio of wall-material to core-material 2:1,ratio of wall-material 2.5:1,emulsifier amount used 0.1wt%,Glutaric dialdehyde amount used 3.5 ml,the pH 9 and temperature of reaction 60℃,the stir speed was 800r/s.

Key words: fish oil, complex coacervation, microencapsulation, optimum preparation conditions