期刊
CARBOHYDRATE POLYMERS
卷 112, 期 -, 页码 569-577出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.06.037
关键词
Glass transition; Crystallization; Sorption calorimetry; QCM-D; X-ray scattering; DSC
资金
- Knowledge Foundation (KK-stiftelsen) [20110158]
- Biofilms Research Center for Biointerfaces
- Gustav Th Ohlsson Foundation
We investigated hydration of acid hydrolyzed potato starch (maltodextrin) employing a multi-method approach. In particular, synchrotron radiation X-ray scattering and differential scanning calorimetry were used, and, for the first time, the material was investigated with sorption calorimetry and a newly developed quartz crystal microbalance with humidity scanning. The dry starch was found to be in an amorphous state. During hydration it exhibits a glass transition in both bulk and thin film samples, followed by an exothermic event where the starch crystallized. Recrystallized bulk samples displayed neither a pronounced glass transition nor crystallization upon hydration whereas both events occurred in thin film samples. The hydration-driven crystallization resulted in an X-ray pattern consistent with the coexistence of A and B type crystallites; however, at higher water concentrations only the B form occurred. The results were used to construct the first ever acid hydrolyzed starch water phase diagram. (C) 2014 Elsevier Ltd. All rights reserved.
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