Rheological properties of starches from grain amaranth and their relationship to starch structure

Xiangli Kong, Stefan Kasapis, Eric Bertoft, Harold Corke*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Amaranth starch (Amaranthus cruentus L. and Amaranthus hypochondriacus L.) in this investigation possessed a relatively small and uniform granule size of a type "A" pattern obtained by X-ray diffraction, with the degree of crystallinity ranging from 24.5 to 27.9%. This was followed by work on steady and dynamic rheological properties on shear of seven native amaranth starches. Aqueous pastes (5% solids) exhibited shear-thinning behavior, and the flow behavior was fitted with the Herschel-Bulkley equation (regression coefficients were over 0.99). Cultivar V69 showed much higher G′ (storage modulus) and G′ (loss modulus) than the other samples and produced a solid-like gel, which could be attributed to the high amylose content of its network. Correlation analysis revealed that amylose content was positively correlated with G′ and negatively with the loss tangent (tan δ) of the material.

Original languageEnglish
Pages (from-to)302-308
Number of pages7
JournalStarch/Staerke
Volume62
Issue number6
DOIs
StatePublished - Jun 2010
Externally publishedYes

Keywords

  • Amylopectin
  • Grain amaranth
  • Rheological property
  • Starch structure

Fingerprint Dive into the research topics of 'Rheological properties of starches from grain amaranth and their relationship to starch structure'. Together they form a unique fingerprint.

Cite this