School of Graduate Study Department of Chemical Engineering

an index of the extent of molecular degradation and was correlated with intrinsic
viscosity for extruded starch (Ollet et al., 1999).
d) Bulk density
The bulk density depends on the nature of the solid material as well as the amount of air
space within the product. In case of extrusion cooking process, a highly expanded
product with plenty of air space has significantly lower bulk density than a product with a
little air inclusion. Bulk density is very important from the view point of correct volume
of product in the pack and product texture(Sharma et al.,2000).
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