Structural characteristics of low-digestible sweet potato starch prepared by heat-moisture treatment
- Authors
- Na, Jong Hee; Kim, Ha Ram; Kim, Yang; Lee, Joon Seol; Park, Hyun Jin; Moon, Tae Wha; Lee, Chang Joo
- Issue Date
- 15-5월-2020
- Publisher
- ELSEVIER
- Keywords
- Sweet potato starch; Slowly digestible starch; Heat-moisture treatment
- Citation
- INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, v.151, pp.1049 - 1057
- Indexed
- SCIE
SCOPUS
- Journal Title
- INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
- Volume
- 151
- Start Page
- 1049
- End Page
- 1057
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/55683
- DOI
- 10.1016/j.ijbiomac.2019.10.146
- ISSN
- 0141-8130
- Abstract
- The objectives of this study were to optimize the conditions for the preparation of sweet potato starch containing a high proportion of slowly digestible starch (SDS) by heat-moisture treatment (HMT), and to investigate the structural properties of SDS and resistant starch (RS) fractions isolated from this modified starch. Response surface methodology evaluation of considering temperature, time, and moisture content was conducted to determine the HMT condition for maximizing SDS yield. Maximum SDS content (50.9%) was obtained after 8.6 hat 113 degrees C with 22.8% moisture level. Scanning electron micrographs of RS fractions displayed growth ring structure and hollow regions. X-ray diffraction patterns of SDS + RS and RS fractions were not changed by HMT. Gelatinization enthalpy of the SDS + RS fraction was decreased more than that of the RS fraction. The results indicated that the SDS fraction consisted of less perfect crystallites and amorphous regions, whereas the RS fraction was composed mostly of crystalline regions. (C) 2019 Elsevier B.V. All rights reserved.
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