喷雾干燥法制备蛋氨酸微胶囊工艺的优化

Optimization of Technology for Microencapsulation of Methionine by Spray-drying

摘要:

为了制备出在对虾配合饲料里能被对虾利用的微胶囊蛋氨酸,选用明胶和海藻酸钠作微胶囊壁材,对喷雾干燥法制备晶体蛋氨酸微胶囊的工艺优化进行了研究,采用正交试验法确定了微胶囊的最佳配方和喷雾干燥的最佳工艺参数。结果表明,晶体蛋氨酸微胶囊的优化配方:壁材为海藻酸钠质量分数1%和明胶质量分数1%、芯材为蛋氨酸质量分数15%、进料温度65℃;喷雾干燥最佳工艺条件为:进风温度195℃、出风温度80℃、进料速度45 mL/min,在此条件下,晶体蛋氨酸微胶囊包埋率为89.6%,用扫描电镜(SEM)观察微胶囊表面光滑圆整无小孔,形状规则,无粘连现象。

Abstract:

In order to prepare microencapsulation methionine,which could be absorbed and utilized in shrimp feeds,the wall materials and the technology of embedding by spray-drying were studied in this manuscript.The method was confirmed,which used the alginate and gelatin as wall materials,the methionine powder as core material and spray drying technology.Results showed that the best parameters of the embedding of the microcapsule were that the 1% alginate and 1% gelatin,the methionine powder was 15%,the feed temperature was 65 ℃,the air inlet temperature was 195 ℃ and theair outlet temperature was 80 ℃,the feed speed was 45 mL/min,and the embedding rate reached to 89.6%.Scanning Electron Microscopy(SEM) has been applied to the study on the surface superstructure of microencapsulated methionine,which was of regulation and uniformity,not conglutination.