The GT values ranged from 63 to 75 C. The highest GT valuewas
found for the corn sauces and the lowest for the potato sauces. GT
was related to the speed of the starch-swelling process. Potato
starch granules swelled very quickly and at the lowest temperature,
while swelling in the corn starch granules was delayed until higher
temperatures were reached. The high swelling capacity of potato
starch was also associated with the higher PV achieved in the
potato sauces in comparison with the corn sauces. Similar results
were found by Swinkels (1985) in native starches. The high PV of potato was explained by the presence of negatively charged phosphate
groups. In the corn sauces, the low PV was partly due to the
presence of amylose–lipid complexes.