Drying behavior and locking point of single droplets containing functional oil
Drying behavior and locking point of single droplets containing functional oil
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DOI：
10.1016/j.apt.2016.06.006
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发表时间：
2016-07-01
影响因子：
5.2
通讯作者：
Tsotsas, Evangelos
中科院分区：
文献类型：
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作者：
Shamaei, Samira;Kharaghani, Abdolreza;Tsotsas, Evangelos
在喷雾干燥功能油的微胶囊化过程中，第二个干燥阶段称为锁定点的开始起着至关重要的作用。第一和第二干燥周期之间的过渡可以通过改变球体迁移到液滴/颗粒表面的机制来直接影响包封率和脂质氧化。用液滴悬浮法测定了核桃油加入脱脂奶粉溶液制备的单乳液滴的锁定点。考察了干燥空气温度(80-140℃)、总固体含量(12-33%w/w)和油/壁材质量分数(0.25-1.00w/w)对液滴/颗粒干燥行为、收缩和锁定点的影响。后者是通过绘制干燥速度随液滴/颗粒含水率的变化曲线来实现的。此外，利用激光共聚焦扫描显微镜(CLSM)研究了产物颗粒的形貌。最后，建立了从实验变量估计闭锁点的回归函数。总体而言，这些研究可以为提高功能油微胶囊化的工业规模喷雾干燥器的包封率和减轻脂肪氧化铺平道路。(C)2016年日本粉末技术学会。由Elsevier B.V.和日本粉末技术学会出版。版权所有。
Inception of the second drying stage called locking point plays a crucial role in the microencapsulation process of functional oils by spray drying. The transition between the first and the second drying periods can directly affect encapsulation efficiency and lipid oxidation by modifying the mechanism of globules migration to the surface of droplet/particles. In this study, the locking point of a single emulsion droplet prepared by incorporating walnut oil into skim milk powder solution was determined using a droplet suspension device. The effects of drying air temperature (80-140 degrees C), total solid content (12-33% w/w), and oil/wall material mass fraction (0.25-1.00 w/w) were assessed on the droplet/particle drying behavior, shrinkage, and locking point. The latter was achieved by plotting the variation of drying rate against moisture content of the droplet/particle. Moreover, confocal laser scanning microscopy (CLSM) was applied in order to investigate the morphology of the produced particles. Finally, a regression function for estimating the locking point from experimental variables was developed. Overall, such research can pave the way towards increasing the encapsulation efficiency and mitigating the lipid oxidation in industrial-scale spray dryers applied for microencapsulation of functional oils. (C) 2016 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.