Kinetics of starch digestion and functional properties of twin-screw extruded sorghum

Mahasukhonthachat, K., Sopade, P.A. and Gidley, M.J. (2010) Kinetics of starch digestion and functional properties of twin-screw extruded sorghum. Journal of Cereal Science, 51 3: 392-401. doi:10.1016/j.jcs.2010.02.008


Author Mahasukhonthachat, K.
Sopade, P.A.
Gidley, M.J.
Title Kinetics of starch digestion and functional properties of twin-screw extruded sorghum
Journal name Journal of Cereal Science   Check publisher's open access policy
ISSN 0733-5210
1095-9963
Publication date 2010-05
Sub-type Article (original research)
DOI 10.1016/j.jcs.2010.02.008
Volume 51
Issue 3
Start page 392
End page 401
Total pages 10
Place of publication London, United Kingdom
Publisher Academic Press
Collection year 2011
Language eng
Formatted abstract
The time-course of starch digestion in twin-screw extruded milled sorghum grain was investigated using an in-vitro procedure based on glucometry. The sorghum grains were hammer-milled, and extruded at three levels each of moisture and screw speed. Irrespective of the extrusion conditions, extruded and non-extruded milled sorghum grain exhibited monophasic digestograms, and the modified first-order kinetic and Peleg models adequately described the digestograms. Extrusion increased the rate of digestion by about ten times compared with non-extrudates. Starch gelatinisation varied in the extrudates, and microscopy revealed a mixture of raw, gelatinised and destructured starch and protein
components in the extrudates. Starch digestion parameters significantly (p < 0.05) correlated with extruder response and various functional properties of the extrudates. Extrusion conditions for maximum starch gelatinisation in milled sorghum grain for fastest digestion as an efficient animal feed were interpolated, as well as the conditions for directly-expanded extrudates with potential for human food, where minimum starch digestion is desired.
Crown Copyright © 2010 Published by Elsevier Ltd. All rights reserved.
Keyword Extrusion
Starch digestion
Digestogram
Functional properties
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Agriculture and Food Sciences
 
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Created: Sun, 11 Jul 2010, 00:04:31 EST