WSI decreased.
Gomez and Aguilera (1984) concluded that low feed moisture
content of extrudate reduced starch gelatinization and shear
degradation of starch, which reduced the physical breakdown of
the granules. This may be a possible reason why water solubility
index of extrudates increased with the decreasing of feed moisture
content. Cumming, Stanley, and Deman (1973) concluded
that the high temperature in the extrusion processing caused
most of the water soluble protein to break into small subunits, or
become insoluble, and/or be redistributed. This phenomenon may
cause to decrease the water solubility index with increasing
temperature and soy protein isolate. Different results indicate
that the key factor that affects the WSI is how much of the water
soluble protein turns into water insoluble. In this study it has
been shown that, at the lower temperature condition, increasing
water content will increase the starch gelatinization and the
protein denaturation, but when the temperature is higher to
180 C, the water soluble protein begin to break into insoluble
subunits hence the adding water content resulted the decrease of
the WSI. Fig. 4.
WSI decreased.Gomez and Aguilera (1984) concluded that low feed moisturecontent of extrudate reduced starch gelatinization and sheardegradation of starch, which reduced the physical breakdown ofthe granules. This may be a possible reason why water solubilityindex of extrudates increased with the decreasing of feed moisturecontent. Cumming, Stanley, and Deman (1973) concludedthat the high temperature in the extrusion processing causedmost of the water soluble protein to break into small subunits, orbecome insoluble, and/or be redistributed. This phenomenon maycause to decrease the water solubility index with increasingtemperature and soy protein isolate. Different results indicatethat the key factor that affects the WSI is how much of the watersoluble protein turns into water insoluble. In this study it hasbeen shown that, at the lower temperature condition, increasingwater content will increase the starch gelatinization and theprotein denaturation, but when the temperature is higher to180 C, the water soluble protein begin to break into insolublesubunits hence the adding water content resulted the decrease ofthe WSI. Fig. 4.
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