本实验通过喷雾干燥前对SPI溶液95 ℃15 min热处理及形成乳液后加入乳糖溶液制备粉末样品，并将部分干粉储存于RH 75%环境中记录其7 d内等温吸湿线，待吸湿稳定后得到湿粉样品，测定原始乳液及干、湿粉末复溶乳液的粒径大小分布，干、湿粉末的水分含量、包埋效率（ME）、溶解速率并用扫描电镜（SEM）观察其微观结构。结果表明热处理和加糖处理能显著提高喷雾干燥SPI稳定乳液的包埋效率，高达98.68%，相对于未经处理的SPI乳液包埋效率高出1倍以上，此外含糖粉末表现出良好的溶解性，但潮湿环境对其溶解性、包埋效率及微观结构有较大影响。

Emulsions of soy oil in 95 ℃ 15 min heat-treated SPI solutions and/or in addition with lactose solution were prepared and subsequently spray-dried to yield powders, some of them were then stored at 75 % relative humidity to record moisture sorption isotherm within 7 days and get sample when equilibrated. The emulsions were characterized by droplet size distribution before spray drying and after dissolution of dry and wet powders. Also moisture content, microencapsulation efficiency (ME), dissolution rates were determined and micro-structure was established by scanning electron microscopy (SEM). It concluded that heat treating and addition with lactose could greatly increase ME of SPI-stabilized emulsions than that of untreated emulsions, which was up to 98.68%, powders containing lactose performed well encapsulation properties but humid atmosphere highly affect them.

国家自然科学基金项目（30972049）