桂花精油微胶囊制备工艺优化

Optimum processing of Osmanthus essential oil microcapsule

通过单因素实验考察了喷雾干燥技术对桂花精油微胶囊包埋率的影响,确定了壁材配比、均质压力、进口风温度和进料速度四个因素的取值范围;在芯材与壁材配比保持1∶6(g:g)不变的条件下,采用Box-Behnken实验设计,优化桂花精油微胶囊的制备工艺。结果表明:壁材阿拉伯胶与麦芽糊精的配比1∶2.5(g:g)、均质压力40 MPa、进口风温225℃、进料速度8 m L/min。在此条件下,桂花精油微胶囊包埋率预测值为98.23%,实际包埋率为97.67%,相对误差小于1%。且桂花精油微胶囊产品具有良好的感官及物化特性,桂花精油含量为12.62%。

The technological conditions of the spray-drying method for the preparation of microcapsule with the maltodextrin and gum acacia compound as wall material,Osmanthus essential oil as core,respectively. With microencapsulating rate as the main evaluating index,the processing technology for preparing Osmanthus essential oil micro-encapsulation by spray-drying was investigated and optimized by single-factor experiments and the response surface methodology. The result showed that the optimum processing parameters for the microencapsulation were as follows： The composition of the proper ratio of wall to material was the 1∶ 2.5（ g： g） ratio of Arabic gum to malt dextrine and the mass ratio of core material to wall material was1∶ 6（ g： g）,the homogeneous pressure was 40 MPa,the temperature of inlet wind for the spray-drying was 225 ℃ and the feed speed was 8 m L/min.Under the optimized technology,the predicted encapsulating rate of micro-encapsulation was 98.23%,the actual encapsulating rate was 97.67%,and the relative error was smaller than 1%.The microcapsule particles of Osmanthus oil had much better sensory and physical-chemical index and content of Osmanthus oil was 12.62%.