期刊
MATERIALS LETTERS
卷 139, 期 -, 页码 245-248出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2014.10.047
关键词
Vacuum freeze-drying; Monitor; Phenolphthalein
To improve the quality of the product, an important subject in vacuum freeze-drying process is to accurately monitor the state of water at its freezing stage and that of the residual water at its drying stage. In this paper, an easy-to-perform method is shown to monitor the state of water during the whole freeze-drying process (i.e. the state of water in the It stage and that of the residual water in drying stage) based on colour changes of phenolphthalein. A sample prepared with phenolphthalein was sensitive to structural changes of water hydrogen bonding network and exhibited colour-changing effect. This makes it possible to accurately trace the dynamic freeze-drying process, thus providing a valuable tool for preparing high-quality products. (C) 2014 Elsevier By. All rights reserved.
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