Journal
FOOD CHEMISTRY
Volume 152, Issue -, Pages 113-120Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2013.11.145
Keywords
Amylosucrase; Branched chain length distribution; Digestion; Slowly digestible starch; Waxy corn starch
Funding
- BioGreen 21 Program [11007192]
- Cooperative Research Program for Agriculture Science & Technology Development, Rural Development Administration, Republic of Korea [PJ008575]
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Starches with high slowly digestible starch (SDS) contents were prepared by treating completely gelatinized waxy corn starch with amylosucrase. The structural properties of the prepared starches were then investigated. The content of SDS increased by up to 38.7% after amylosucrase modification, and the portion of chains with degree of polymerisation (DP) 25-36 increased, while the portion of chains with DP <= 12 decreased. Amylosucrase-modified starches showed a weak B-type crystalline structure. A slight increase in the degree of relative crystallinity was observed with increased reaction time. The thermal properties, including melting temperature and enthalpy, of the amylosucrase-modified starches were higher than for the control starch. Although the amylosucrase-modified starches showed varying structural properties according to reaction time (1-45 h), their digestibilities did not change much after 6 h. By controlling the reaction time of the amylosucrase treatment, a tailored starchy food containing the desired amount of SDS can be produced. (C) 2013 Elsevier Ltd. All rights reserved.
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