3.5. Textural properties
Textural properties of starch paste or gel are affected by different
factors including interactions between dispersed and continuous phases, properties of the amylose matrix and volume fraction and
amylose content (Mua & Jackson, 1997). Determination of the textural
properties of samples (Table 3) showed that with increasing
the concentrations of acetic acid, consistency and cohesiveness of
both samples reduced significantly. Similar results were reported
for PG maize and wheat starches as affected by L-ascorbic acid
and native wheat starch as affected by some organic acids including
acetic acid (Majzoobi et al., 2014a, 2014b, 2015). These changes
may be related to the hydrolysis of amylose and amylopectin chains
in the presence of acetic acid resulting in smaller chain lengths of
these molecules. Comparing the samples, PGCS showed higher
reduction in consistency (26.01% vs. 20.05%) and cohesiveness
(46.62% vs. 28.86%) than PGWS. Differences in the molecular structure
and size of these two samples, lower pH of PGCS which may
cause smaller starch molecules as well as higher amount of nonstarch
components in the PGCS which can hinder starch network
development can result in lower consistency and cohesiveness of
this sample.
3.5. Textural propertiesTextural properties of starch paste or gel are affected by differentfactors including interactions between dispersed and continuous phases, properties of the amylose matrix and volume fraction andamylose content (Mua & Jackson, 1997). Determination of the texturalproperties of samples (Table 3) showed that with increasingthe concentrations of acetic acid, consistency and cohesiveness ofboth samples reduced significantly. Similar results were reportedfor PG maize and wheat starches as affected by L-ascorbic acidand native wheat starch as affected by some organic acids includingacetic acid (Majzoobi et al., 2014a, 2014b, 2015). These changesmay be related to the hydrolysis of amylose and amylopectin chainsin the presence of acetic acid resulting in smaller chain lengths ofthese molecules. Comparing the samples, PGCS showed higherreduction in consistency (26.01% vs. 20.05%) and cohesiveness(46.62% vs. 28.86%) than PGWS. Differences in the molecular structureand size of these two samples, lower pH of PGCS which maycause smaller starch molecules as well as higher amount of nonstarchcomponents in the PGCS which can hinder starch networkdevelopment can result in lower consistency and cohesiveness ofthis sample.
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