Physicochemical properties of A- and B-type granules isolated from waxy and normal hull-less barley starch

Mengting Ma, Letong Sun, Xiaojing Chen, Zekun Xu, Chuangchuang Zhang, Wuyang Huang*, Zhongquan Sui*, Harold Corke

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Large A-type and small B-type starch granules separated from waxy and normal hull-less barley starches were investigated for their physicochemical properties. Hull-less barley starch granules were covered by a membrane composed mainly of phospholipids. Channels of waxy A- and B-type granules were rich in proteins and phospholipids. Compared with A-type starch, B-type starch exhibited higher specific surface area, volume and average diameter of mesopores. Waxy A-type granules exhibited the higher peak, breakdown, final and setback viscosity than did B-type granules, while normal A-type granules showed the lower peak, breakdown, final viscosity and the higher setback viscosity than did B-type granules. B-type starch gels with lower storage modulus exhibited a less elastic gel network structure and retrograded more slowly. Moreover, in vitro hydrolysis of starch showed that the B-type granules exhibited a higher hydrolysis extent and rate than the A-type granules in the first stage, which was consistent with higher initial α-amylase binding ability of B-type granules. The study showed that the A-type and B-type starch separated from waxy and normal hull-less barley exhibited very different physicochemical properties.
Original languageEnglish
JournalInternational Journal of Biological Macromolecules
DOIs
StateE-pub ahead of print - 1 Jun 2022

Keywords

  • A-type hull-less barley starch
  • B-type hull-less barley starch
  • Physicochemical properties

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