The water absorption index
(WAI) and the water solubility index (WSI) of grape marc flour (GMF) and parboiled rice bran (PRB) were determined according to the methodology by Assis (2009).
As the temperature increased, the bulk density and water absorption index
increased firstly and then decreased.
Such characteristics include water absorption index
, bulk density, water solubility index, expansion index, texture, and color [14-17].
The skin depth ([delta]), power penetration depth ([D.sub.p]), and absorption index
(k) have been evaluated.
where hv photon energy, a = 4nk / Z = absorption coefficient (k = absorption index
or absorbance) and A= constant.
Statistical analyses showed significant differences in various extrudate properties, such as moisture content, water activity, color, bulk density, hardness, water solubility index, water absorption index
, expansion ratio, pellet durability index and dietary fiber content.
Water absorption index
(WAI) and water solubility index (WSI) were assessed on raw materials and blends before and after extrusion process (ANDERSON et al., 1969).
Through the assessment and comparison of different indexes such as transfer factor (TF), enrichment factor (EF), and the absorption index
, the ability of Ricinus communis L.
The absorption index
is related to the subject thickness, and the composer substance atomic number of the subject.
The particulate water absorbent has a first salt concentration absorption index
of not less than 0.60 as measured by a formula below when ion exchange water is used as an aqueous solution of a constant salt concentration: (salt concentration absorption index
)=(absorbency for an aqueous solution of a constant salt concentration against a pressure of 4.83 kPa)/(absorbency for an aqueous solution of a constant salt concentration against no pressure).
Extrudates were characterized concerning specific volume (SV), expansion index (EI), water absorption index
(WAI), water solubility index (WSI), color and texture.