The HPV which is the minimum viscosity value measuring
the ability of paste to withstand breakdown during cooling
ranged between 598.33 cP for T5 to 832.00 cP for T1.
Breakdown is a parameter that measures the ease with which
the swollen granules can be disintegrated (Kaur and Singh,
2005). The lower breakdown viscosities (BD) were found in
composite flours, as compared with the wheat flour. This
may be due to restricted swelling of the starch granules, which
increased the tendency of the hydrophilic chain of the fiber in
composite flours to bind with hydrogen bonds of the water,
causing a decrease in available water for starch granules. The
breakdown viscosity also decreases as increase in soybean flour
level in composite flour. It can be regarded with the susceptibility
of protein to heat damage (Devi and Haripriya, 2012). The
final viscosity (CPV) indicated the re-association of starch
granules especially amylose during cooling time after gelatinization
and the formation of gel network (Ortega-Ojeda
et al., 2004). The lower breakdown (BD) and final viscosity
(CPV) as increase in soybean flour indicate the ability of the
flour to form a viscous paste or gel after cooking and cooling
as well as the resistance of the paste to shear stress during stirring