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

Asgar Farahnaky, Afsaneh Alishahi, Mahsa Majzoobi, Jafar Al-Hakkak

Research output: Contribution to journalArticle

8 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)138-145
Number of pages8
JournalJournal of Food Engineering
Volume142
Publication statusPublished - 2014

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wheat starch
starch gels
Starch
Triticum
physicochemical properties
Gels
Heating
heat
Viscosity
viscosity
gels
starch
stress relaxation
combs (social insects)
Biopolymers
chewiness
depolymerization
pasting properties
biopolymers
Hardness

Cite this

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title = "Effect of mixing speed and time on some textural and physicochemical properties of wheat starch gels",
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 {\~A}‚°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.",
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Effect of mixing speed and time on some textural and physicochemical properties of wheat starch gels. / Farahnaky, Asgar; Alishahi, Afsaneh; Majzoobi, Mahsa; Al-Hakkak, Jafar.

In: Journal of Food Engineering, Vol. 142, 2014, p. 138-145.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of mixing speed and time on some textural and physicochemical properties of wheat starch gels

AU - Farahnaky, Asgar

AU - Alishahi, Afsaneh

AU - Majzoobi, Mahsa

AU - Al-Hakkak, Jafar

N1 - Imported on 12 Apr 2017 - DigiTool details were: Journal title (773t) = Journal of Food Engineering. ISSNs: 0260-8774;

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

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