Effect of mixing speed and time on some textural and physicochemical properties of wheat starch gels

Farahnaky, A, Alishahi, A, Majzoobi, M and Al-Hakkak, J 2014, 'Effect of mixing speed and time on some textural and physicochemical properties of wheat starch gels', Journal of Food Engineering, vol. 142, pp. 138-145.


Document type: Journal Article
Collection: Journal Articles

Title Effect of mixing speed and time on some textural and physicochemical properties of wheat starch gels
Author(s) Farahnaky, A
Alishahi, A
Majzoobi, M
Al-Hakkak, J
Year 2014
Journal name Journal of Food Engineering
Volume number 142
Start page 138
End page 145
Total pages 8
Publisher Elsevier
Abstract The physicochemical and textural properties of wheat starch gels prepared at different mixing speeds, 15, 150 and 350 rpm and heating times, 10, 30, and 45 min at 95 °C were studied and compared. With increasing time and mixing speed most of the textural properties of starch gels obtained from texture profile analysis and residual modulus of Maxwell model obtained from stress relaxation data decreased. The samples prepared at 15 rpm and 10 min heating had the highest hardness, springiness, cohesiveness, chewiness and gumminess values whilst, the gels prepared at 350 rpm and 45 min had the lowest values for these textural properties. The images of starch gels taken by scanning electron microscopy indicated that with increasing the time and speed of mixing, honeycomb-like structure of the gels formed larger cells with thicker cell walls. Intrinsic viscosity of the samples decreased with increasing heating time and mixing speed indicating depolymerisation of starch biopolymers. Rapid Visco Analyzer data showed reduction in cold-water viscosity of starch gels with increasing time and mixing speed. Mixing speed and time during starch pasting are determining factors of final textural properties, therefore require through control to achieve final products of consistent characteristics. © 2014 Elsevier Ltd. All rights reserved.
Subject Food Processing
Keyword(s) Corn starch
Mixing speed
Mixing time
Physicochemical properties
Starch gel
DOI - identifier 10.1016/j.jfoodeng.2014.06.009
Copyright notice © 2014 Elsevier Ltd. All rights reserved.
ISSN 0260-8774
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