Phospholipid Microencapsulation Technology

The paper studies the microencapsulation process and technique of powder phospholipid. The two processes, the preparation of emulsion and microencapsulation of spray drying are investigated.Through single factor experiments, several factors influencing the stability of the system, such as shear time, shear speed, shear temperature, the selection of emulsifier and its concentration etc., were researched. Optimized experimental results by orthogonal design method reveals the better emulsification and spray drying condition as follows: the wall materials are mixtures of malt-dextrin and gelatin with weight ratio of 3:1, shear time is 15min, shear speed is 5500r/min, shear temperature is 45℃, the emulsifier is sucrose ester of fatty acids with weight ratio of 2.5%, air inlet temperature is 160℃, air output temperature is 114℃ and the feed flow rate of emulsion is 20mL/min .The microencapsulation efficiency reaches 68%.On the base of above experiments, another glycoprotein system, a new wall material, was investigated. The experiments made a breakthrough that the microencapsulation efficiency is over 90%. The optimized experimental parameters are given: the ratio of protein and dextrin is 1:2.5 in glycoprotein, the weight percent of core material is 50%, shear time is 30min, shear speed is 13000r/min, shear temperature is 70~80℃, emulsion is homogenized two times, the homogenous pressure is 50MPa and 20MPa respectively, solid concentration is 20%, feed temperature is 30~50℃, feed flow rate is 18mL/min, and air inlet temperature is 120-140℃.Finally, other properties of microcapsule product are examined, such as its appearance, dissolving ability, particle size distribution etc.. Experimental results prove that phospholipid microencapsulation method by spray drying is valuable and can be further applied in industrial fields.