This indicated
that HMT allowed the formation of new starch crystallites
with different heat stabilities (Hoover & Manuel, 1996).
The results demonstrated that both treatments causeddifferent alterations of the internal granular structure.
Reduction in gelatinization enthalpy following hydrothermal
treatment indicated partial gelatinization of some less
heat stable molecules. The observed values were 11.03 J/g
for AR and 10.86 J/g for HR. However, there were no
statistical difference (P40:05).
After storage at 4 1C for seven days, gelatinized starch
molecule reassociate to an ordered structure and this is
referred to retrogradation. Results showed that retrogradation
endotherm of all starches appeared at low
temperature and gave low enthalpy compared to the
gelatinization endotherm. As compared to that of UR
starch, retrogradation endotherm of AR and HR slightly
shifted to high temperature and appeared smaller. However,
the differences were not found significant (P40:05).