As a measure for the breaking force and thus for the crispiness of the biscuits, the
maximum positive force (Fmax in N) in the measuring curve, that was necessary for the
insertion of a measuring probe (SMS P/2) into the center of the biscuit, was
determined. Before measuring, the biscuits were conditioned at 20 °C and 50% RH.
Settings of the Texture Analyser: Test method: force in direction of compression,
breaking test; test speed: 0.2 mm/s; post test speed: 10 mm/s; distance of breakage
and test distance: 1 mm and 5 mm; trigger value: 0.10 N. For each recipe, 20
measurements were done.
The biting process of the noodles during the measurement should be imitated as far as
possible, by cutting the cooked noodle with a knife made from perspex (light knife
blade, thickness: 1 mm, Code A/LKB-F). The criterion is the achievement of an al dente
character. The firmness equates to the maximum positive force (Fmax in N) in the
measuring curve. Settings of the Texture Analyser: Test method: force in direction of
compression, simple test; test speed: 0.1 mm/s; post test speed: 10 mm/s; distance of
breakage and test distance: 1 mm and 1.1 mm; trigger value: 0.02 N. The noodles were
cooked with the optimal cooking time, strained and washed with water for 30 sec.
Immediately after this step, they were transferred into a beaker and filled with water
(at room temperature) to stop the cooking process. Ten measurements for each recipe
were conducted. In fig. 8 the Texture Analyser is demonstrated.