Structural characteristics of low-digestible sweet potato starch prepared by heat-moisture treatment

Jong Hee Na, Ha Ram Kim, Yang Kim, Joon Seol Lee, Hyun Jin Park, Tae Wha Moon, Chang Joo Lee

Research output: Contribution to journalArticlepeer-review

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 h at 113 °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.

Original languageEnglish
Pages (from-to)1049-1057
Number of pages9
JournalInternational Journal of Biological Macromolecules
Volume151
DOIs
Publication statusPublished - 2020 May 15

Keywords

  • Heat-moisture treatment
  • Slowly digestible starch
  • Sweet potato starch

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Economics and Econometrics
  • Energy(all)

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