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A further understanding of the multi-scale supramolecular structure and digestion rate of waxy starch
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Qiao, Dongling, Xie, Fengwei, Zhang, Binjia, Zou, Wei, Zhao, Siming, Niu, Meng, Lv, Rui, Cheng, Qian, Jiang, Fatang and Zhu, Jie (2017) A further understanding of the multi-scale supramolecular structure and digestion rate of waxy starch. Food Hydrocolloids, 65 . pp. 24-34. e12595. doi:10.1016/j.foodhyd.2016.10.041 ISSN 0268-005X.
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Official URL: https://doi.org/10.1016/j.foodhyd.2016.10.041
Abstract
This work concerns how the multi-scale supramolecular structure of starch relates to its digestion rate from a view of structural heterogeneity. The untreated granule starch displayed a dual-phase digestion pattern, ascribed to two digestible fractions within the heterogeneous multi-scale structure of starch, which had prominently different digestion rates. Not only amorphous starch but also part of molecular orders (crystallites with flaws) were digested at a same rate k1 at the first phase; densely-assembled starch including orders with fewer flaws was digested at a rather slow rate k2 (ca. 2/5 of k1) at the second phase. When alkali altered the heterogeneous supramolecular structure of starch, the digestion behaviors were also changed. The 0.1% (w/v) alkali solution slightly disrupted the starch multi-scale structure, which reduced the molecular orders, disrupted the lamellae, weakened the molecular organization within growth rings, and enlarged the granule pores. Then, part of resistant starch was transformed into slowly-digestible fraction with a digestion rate close to k2. In contrast, when stronger (0.5% w/v) alkali was used, the starch multi-scale structure was more apparently disrupted, causing even granule swelling. This structural change resulted in a triple-phase digestion with three different digestion rates. Moreover, especially with stronger alkali, along with the structural disruption, some orders with a higher thermal stability emerged and reduced the accessibility of starch molecules to the enzyme. In this case, the digestion rate decreased with the treatment time.
Item Type: | Journal Article | |||||||||||||||||||||
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Subjects: | Q Science > QP Physiology T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | |||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Digestion, Starch | |||||||||||||||||||||
Journal or Publication Title: | Food Hydrocolloids | |||||||||||||||||||||
Publisher: | Elsevier | |||||||||||||||||||||
ISSN: | 0268-005X | |||||||||||||||||||||
Official Date: | April 2017 | |||||||||||||||||||||
Dates: |
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Volume: | 65 | |||||||||||||||||||||
Page Range: | pp. 24-34 | |||||||||||||||||||||
Article Number: | e12595 | |||||||||||||||||||||
DOI: | 10.1016/j.foodhyd.2016.10.041 | |||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
Date of first compliant deposit: | 11 March 2019 | |||||||||||||||||||||
Date of first compliant Open Access: | 11 March 2019 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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