Microencapsulation Exploration of Squalene by Ultrasonic Spraying and Freeze-Drying

Squalene, a natural antioxidant, was microencapsulated by the method of ultrasonic spraying and freeze-drying using shell materials of gelatin and arabic gum. The suitable condition for ultrasonic emulsification before ultrasonic spraying and freeze-drying was frequency 28 kHz and running time 20 min. The reasonable condition for microencapsulation of squalene by ultrasonic spraying and freeze-drying was gelatin 3.0 %, arabic gum 5.0 %, maltodextrin 6.0 % and sucrose ester 0.9 %. The appearance and size of microcapsules of squalene were measured by scanning electron microscope and metallographic microscope. The microcapsules of squalene were smonth spheres at the diameter of about 10 μm.