Understanding Starch Gelatinization : the Phase Diagram Approach

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Understanding Starch Gelatinization : the Phase Diagram Approach

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Publication Article, peer reviewed scientific
Title Understanding Starch Gelatinization : the Phase Diagram Approach
Author(s) Carlstedt, Jonas ; Wojtasz, Joanna ; Fyhr, Peter ; Kocherbitov, Vitaly
Date 2015
English abstract
By constructing a detailed phase diagram for the potato starch–water system based on data from optical microscopy, synchrotron X-ray scattering and differential scanning calorimetry, we show that gelatinization can be interpreted in analogy with a eutectic transition. The phase rule explains why the temperature of the gelatinization transition (G) is independent on water content. Furthermore, the melting (M1) endotherm observed in DSC represents a liquidus line; the temperature for this event increases with increasing starch concentration. Both the lamellar spacing and the inter-helix distance were observed to decrease with increasing starch content for starch concentrations between approximately 65 wt% and 75 wt%, while the inter-helix distance continued decreasing upon further dehydration. Understanding starch gelatinization has been a longstanding challenge. The novel approach presented here shows interpretation of this phenomenon from a phase equilibria perspective.
DOI http://dx.doi.org/10.1016/j.carbpol.2015.04.045 (link to publisher's fulltext)
Publisher Elsevier
Host/Issue Carbohydrate Polymers;
Volume 129
ISSN 0144-8617
Pages 62-69
Language eng (iso)
Subject(s) Starch
Synchrotron X-ray scattering
Phase diagram
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/19834 (link to this page)

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