9.2 Extrusion cooking
In tab. 20 and 21 the results of
expansion index and
as numerical codes.
9.2.1 Expansion of snack basis products
The expansion index (mm diameter/mm die) of the extruded products decreased
significantly with increased
index of the 20% SI extrudate (3.57), compared with the 10% SI extrudate (3.17) can be
explained only through a measurement error.
96
Chemical composition and physical properties
Extrusion cooking
the results of the physical measurements of
bulk density are shown. The statistical analyse
Expansion of snack basis products
The expansion index (mm diameter/mm die) of the extruded products decreased
with increased percentage of Sacha Inchi. The significant larger
0% SI extrudate (3.57), compared with the 10% SI extrudate (3.17) can be
explained only through a measurement error. Reasons for the d
urements of breaking strength,
he statistical analyses are demonstrated
The expansion index (mm diameter/mm die) of the extruded products decreased
The significant larger expansion
0% SI extrudate (3.57), compared with the 10% SI extrudate (3.17) can be
the decreased expansion
97
index with increased percentage of SI can be explained by the content of starch, which
was decreasing with increased amount of SI, and an increased fat content.
The bulk density of the extrudate was ranging between 89.93 g/l (10% SI flour) and
325.6 g/l (40% SI flour) and thus, it increased with an increased amount of SI flour in
the blend. No difference was determined between the bulk density of SI flour and
press cake at 10%.
9.2.2 Texture of snack basis products
The breaking force increased significantly with the percentage of Sacha Inchi. It was
ranging between 10.08 N (10% SI flour) and 37.32 N (40% SI flour), as is shown in table
20. Tab. 21 shows, that the type of Sacha Inchi (flour or press cake at 10%) had no
influence on the breaking strength. The significant higher breaking force at 40% SI
flour, compared to the extruded product with 10% SI flour, can be explained through a
clearly higher fat content of the 40% SI extrudate. The higher fat content constricted
the expansion and thus, the snack basis products were more compact and the force
needed to crush them with the Texture Analyser was higher. The breaking force is also
shown in form of a line chart in fig.17.