Hydration and the phase diagram of acid hydrolyzed potato starch

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Hydration and the phase diagram of acid hydrolyzed potato starch

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Publication Article, peer reviewed scientific
Title Hydration and the phase diagram of acid hydrolyzed potato starch
Author(s) Carlstedt, Jonas ; Wojtasz, Joanna ; Fyhr, Peter ; Kocherbitov, Vitaly
Date 2014
English abstract
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.
DOI http://dx.do.org/10.1016/j.carbpol.2014.06.037 (link to publisher's fulltext)
Publisher Elsevier
Host/Issue Carbohydrate Polymers;
Volume 112
ISSN 0144-8617
Pages 569-577
Language eng (iso)
Subject(s) Glass transition
Sorption calorimetry
X-ray scattering
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/18367 (link to this page)

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