Abstract: Takeing microencapsulation efficiency as the main evaluating index, the optimum homogenizing times for microencap- sulation of jade perch oil is determined as twice, and by L9(33) orthogonal test the optimum processing conditions of microencapsulation of jade perch oil are determined as follows: inlet-air temperature 215 ℃, outlet-air temperature 95 ℃ and homogenizing pressure 45 MPa. By scanning electron microscppe(SEM) the micro-structure observation of the microcapsule of jade perch oil showed that both the surface and inside structures are good. The peroxide value (POV) of the microcapsule of jade perch oil is only 5.45 mmol/kg after storage at 65 ℃ for 12 days, less than that in the fish oil microcapsule standard of the aquatic industry of China (6 mmol/kg), meant that it still maintained good qualities after storage at room temperature for one year. Conformably, after storage at 65 ℃ for 12 days, the thiobarbituric acid (TBA) value of the microcapsule of jade perch oil is much less than that of the original oil. Evidently, the microcapsule of jade perch oil has good characteristics. Therefore, the microencapsulation formulation optimized and the technology processes were reasonable, which may be conducive to the development of jade perch oil into speciality supplement for human health.

Key words: jade perch oil, microencapsulation, spray-drying, oxidation stability