Comparing the water interactions of the samples, it was found
that the PGWS had lower cold water solubility and higher water
absorption than PGCS starch at various acid concentration and
experiment time which is in agreement with Majzoobi et al.
(2015). The weight average molecular weight of wheat starch is
higher than that of corn starch (400  106 vs. 40–80  106) leading
to lower water solubility and higher water uptake of wheat starch
(Takahashi & Seib, 1988). Therefore, it is possible that the PGWS
also had higher molecular weight than PGCS which require further
studies. In addition, the lower pH values of PGCS particularly
before addition of acetic acid (see Table 1) can result in more starch
degradation and hence higher water solubility and lower water
uptake of this sample.