Pasting profile of flours
The amylose content of the flours were
significantly different according to the pasting
profile (Table 4). Due to the high amylose content
in the rice, the starch granules were strong and
rigid and resisted swelling and disintegration,
while low amylose rice starch granules were weak
and fragile (Ranai and Bhattacharya, 1995). The
peak viscosity of flour tended to decrease as the
amylose content increased. Flour with a lower peak
viscosity has a lower thickening power than flour
with higher peak viscosity. Therefore, the glutinous
rice flour had higher thickening power than the
Hom-Mali rice flour. In addition, breakdown
tended to decrease whereas pasting temperature,
final viscosity and setback value increased as the
amylose content increased. The final viscosity of
the rice paste was related to the amylose content.
Flour with higher amylose content had a higher
final viscosity. The set back was also related to