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The functional properties of food powders are largely dependent
of the surface composition, size and surface characteristics
of the particles. Oscillatory rheology of PFD is strongly influenced
by particle size of the powders and with the sediment volume fraction.
The gel rigidity of the dispersion increased significantly above
the peak gelatinization temperature. The glass transition temperature
and starch–lipid complex melting temperature of PF were
duly affected by particle size. The mechanical, thermal and optical
properties of PF showed reverse trends when the particle size was
reduced to 74 lm. Overall, a strong particle size dependency of PF
properties are described by a second-order polynomial equations
(Table 6). Microscopic study exhibited the disruption of cell walls
above the critical particle size limit. Since the composition of the
PF in the particles was affected by size reduction, and, therefore
further investigations are needed to establish particle size and
individual component (starch/protein/lipid) on structural property
of PF gel. These rheological and thermal properties of PF provide
important information for selecting particle size in food product
development with desired texture.
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