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Understanding the structural features of high-amylose maize starch through hydrothermal treatment

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Yang, Jianing, Xie, Fengwei, Wen, Wenqiang, Chen, Ling, Shang, Xiaoqin and Liu, Peng (2016) Understanding the structural features of high-amylose maize starch through hydrothermal treatment. International Journal of Biological Macromolecules, 84 . pp. 268-274. doi:10.1016/j.ijbiomac.2015.12.033

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Official URL: http://dx.doi.org/10.1016/j.ijbiomac.2015.12.033

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Abstract

In this study, high-amylose starches were hydrothermally-treated and the structural changes were monitored with time (up to 12 h) using scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), small-angle X-ray scattering (SAXS), X-ray diffraction (XRD), and differential scanning calorimetry (DSC). When high-amylose starches were treated in boiling water, half-shell-like granules were observed by SEM, which could be due to the first hydrolysis of the granule inner region (CLSM). This initial hydrolysis could also immediately (0.5 h) disrupt the semi-crystalline lamellar regularity (SAXS) and dramatically reduce the crystallinity (XRD); but with prolonged time of hydrothermal treatment (≥2 h), might allow the perfection or formation of amylose single helices, resulting in slightly increased crystallinity (XRD and DSC). These results show that the inner region of granules is composed of mainly loosely-packed amylopectin growth rings with semi-crystalline lamellae, which are vulnerable under gelatinization or hydrolysis. In contrast, the periphery is demonstrated to be more compact, possibly composed of amylose and amylopectin helices intertwined with amylose molecules, which require greater energy input (higher temperature) for disintegration.

Item Type: Journal Article
Subjects: S Agriculture > SB Plant culture
T Technology > TP Chemical technology
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Cornstarch -- Structure, Hydrolysis
Journal or Publication Title: International Journal of Biological Macromolecules
Publisher: Elsevier
ISSN: 0141-8130
Official Date: March 2016
Dates:
DateEvent
March 2016Published
11 December 2015Accepted
Volume: 84
Page Range: pp. 268-274
DOI: 10.1016/j.ijbiomac.2015.12.033
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
21106023[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
31271942[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
1201410965Bureau of Education of Guangzhou MunicipalityUNSPECIFIED
201511078034Guangzhou da xue‏http://viaf.org/viaf/149744854
510640South China University of Technologyhttp://dx.doi.org/10.13039/501100005015

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