Structural analysis of spray-dried powders by confocal laser scanning microscopy
Structural analysis of spray-dried powders by confocal laser scanning microscopy
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共焦激光扫描显微镜对喷雾干燥粉末的结构分析
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
P. Linko
中科院分区：
文献类型：
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作者：
A. Soottitantawat;J. Peigney;Yukiko Uekaji;H. Yoshii;T. Furuta;M. Ohgawara;P. Linko
利用激光共聚焦扫描显微镜(CLSM)和扫描电子显微镜(SEM)研究了喷雾干燥粉末的内部和外部形貌随喷雾干燥操作条件的变化。制备了阿拉伯树胶(GA)与麦芽糊精(MD)溶液的混合物，其中GA与MD的质量比为1：3，固体含量为30%。为了使粉末颗粒在激光共聚焦显微镜上可见，用荧光素钠对固体材料进行标记。溶液通过大川L-8型喷雾干燥器在不同的进口空气温度和雾化速度下进料。随着进风温度的升高，空泡增大，颗粒尺寸增大。采用低雾化速度时，液泡较小，液泡产率较低。随着进风温度的升高和雾化速度的提高，粉末的密度降低。此外，所有粉末的表面形貌都呈现出光滑和皱缩的颗粒，但在较低的进口空气温度下，表面会出现较深的凹槽。当雾化速度较低时，可以观察到较多的凹槽。版权所有©2007科廷理工大学和John Wiley&Sons，Ltd.
The internal and external morphology of spray-dried powders were investigated as a function of the operating conditions of the spray dryer by using confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). The blend of gum arabic (GA) and maltodextrin (MD) solution, which is normally used in the encapsulated food industry, was prepared at 30% solid content of the mass ratio of GA and MD of 1 to 3. In order to make the powder particles visible by CLSM, fluorescein sodium was used to label the solid materials. The solutions were fed through an Ohkawara L-8 type spray dryer at different inlet air temperatures and atomizing speeds. An increase in the vacuole as well as the particle size was observed when the inlet air temperature was increased. Smaller vacuoles and lower yields of vacuoles were observed when using low atomization speeds. The density of powders decreased with an increase of the inlet air temperature as well as with an increase of the atomizing speed. Furthermore, the surface morphology presented smooth and shriveled particles for all powders, but deeper surface grooving for low inlet air temperatures. More grooves were observed by using a low atomizing speed. Copyright © 2007 Curtin University of Technology and John Wiley & Sons, Ltd.