正交试验优化复凝聚法制备液体香精微胶囊工艺

为将液体香精加工成缓释性固体粉末香精，以明胶和海藻酸钠为壁材，用复凝聚法制备液体香精微胶囊，以包埋率为评价指标，研究了不同因素对微胶囊制备效果的影响，通过正交试验优化工艺条件。结果表明，壁材为质量分数1%明胶溶液与0.5%海藻酸钠溶液按3∶1的质量比混合、液体香精与壁材质量比1∶1、复凝pH 4.0～4.5条件下，平均包埋率达92.80%，对包埋率影响最大的因素为两壁材的比例。用石油醚浸提，与同类固体粉末香精对比考察，验证了所包埋的微胶囊具有较好的缓释效果。

Application of Orthogonal Array Design to Optimize the Preparation of Liquid Essence Microcapsules by Complex Coacervation

The preparation of sustained-release essence powder by microencapsulating liquid essence with gelatin and
sodium alginate as the coating materials using a complex coacervation method was optimized for improved embedding
rate using an orthogonal array design. It was demonstrated that the average embedding rate was 92.80% when the complex
coacervation was carried out at pH ranging from 4.0 to 4.5 using a coating material consisting of a 3:1 (by mass) mixture of 1%
gelatin and 0.5% sodium alginate with a ratio of wall material to core material of 1:1 (by mass). The ratio between the two
coating materials was found to be the factor with the greatest influence on embedding efficiency. Compared with ordinary
essence powder after extraction with petroleum ether, the microcapsule could be effectively released in a sustained manner.