以广佛手精油为原料，对其微胶囊的制备工艺包括壁材组合、乳化工艺（乳化剂组成及用量、芯壁比）及喷雾干燥条件（进风温度、雾化器频率、进料流量）进行了优化研究，确定最优的微胶囊化工艺参数，进而对精油微胶囊产品的品质及微观结构进行分析。结果表明，最佳的广佛手精油微胶囊制备工艺为：（1）壁材组合（阿拉伯胶:β-环糊精:麦芽糊精）的最佳配比为9:7:4 (g/g/g)；（2）乳化工艺的最佳条件为：复合乳化剂配比（单甘酯:蔗糖脂肪酸酯）为3:7（g/g），用量为0.8%、芯材与壁材配比为3:7（g/g）；（3）喷雾干燥的最佳条件为：进风温度180 ℃，雾化器频率30 Hz，进料流量55 mL/min。在此工艺条件下所制得的广佛手精油微胶囊具有较好的感官、物化特性及缓释性能，其包埋率高达85.32%，溶解度为93.25%，含水量低至2.65%，加热15 h挥发率只有12.24%，比未微胶囊化产品降低了79.47%。扫描电镜结果显示所制备的佛手精油微胶囊颗粒表面连续，呈较光滑的球形。因此，在最佳工艺条件下制备的广佛手精油微胶囊化产品具有良好的品质。

In this study, the preparation process of microcapsules using bergamot essential oil as the raw material was optimized, including wall material combination, emulsification process (emulsifier composition and dosage, core-to-wall material ratio ) and spray drying conditions (inlet air temperature, atomizer frequency, feed flow rate). The optimal process parameters for microencapsulation of bergamot essential oil were first determined, and then the quality and microstructure of the resulting essential oil microcapsule products were analyzed. The results showed that the optimal conditions for preparing the bergamot essential oil microcapsules were: (1) The optimum ratio of wall material (arabic gum : β-cyclodextrin : maltodextrin) was 9:7:4 (g:g:g); (2) The optimum conditions for emulsification included the ratio of composite emulsifier (monoglyceride : sucrose ester) as 3:7 (g:g), a dosage of 0.8% for this composite emulsifier ,and the core-to-wall material ratio as 3:7 (g/g); (3) The optimized spray drying process was at an inlet air temperature of 180 ℃, atomizer frequency of 30 Hz, and feed flow rate of 55 mL/min. Under such optimal microcapsulation conditions, the obtained bergamot essential oil microcapsules possessed good sensory, physico-chemical and sustained release properties. The encapsulation rate and solubility of the products were as high as 85.32% and 93.25%, respectively, with the water content only at 2.65%. After being heated for 15 h, the products had only a volatilization rate of 12.24%, which was 79.47% lower than the unencapsulated products. The results of scanning electron microscopy showed that the obtained bergamot essential oil microcapsules were spherical in shape with smooth and continuous surfaces. Therefore, high-quality bergamot essential oil microcapsules could be produced under the optimized conditions.

广东省“扬帆计划”引进创新创业团队项目（2016YT03S056）