The result from RVA showed that the gelatinization temperature (GT) of different flour fractions was affected by particle size (Table 2). GT was reduced as particle size decreased. This may be due to that the smaller particle size fractions could rapidly absorb water and quickly swell resulting in easily gelatinizing of starch at lower temperatures. Peak viscosity, breakdown viscosity, and final viscosity of higher particle size fractions were inversely lower than those of the smaller particle size. These results were similar to the work of (5) who reported that the finer particle size starch reached the onset temperature quicker and exhibited higher thickening behavior than that of the larger particle size. For the setback
3
viscosity, the obtained values from all fraction were relatively high, indicating that, after cooling, hard texture would be expected (4).
Table 2. Pasting properties of dry-milled rice flour from different fractions.
The result from RVA showed that the gelatinization temperature (GT) of different flour fractions was affected by particle size (Table 2). GT was reduced as particle size decreased. This may be due to that the smaller particle size fractions could rapidly absorb water and quickly swell resulting in easily gelatinizing of starch at lower temperatures. Peak viscosity, breakdown viscosity, and final viscosity of higher particle size fractions were inversely lower than those of the smaller particle size. These results were similar to the work of (5) who reported that the finer particle size starch reached the onset temperature quicker and exhibited higher thickening behavior than that of the larger particle size. For the setback
3
viscosity, the obtained values from all fraction were relatively high, indicating that, after cooling, hard texture would be expected (4).
Table 2. Pasting properties of dry-milled rice flour from different fractions.
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