EVALUATION OF FOUR SORGHUM HYBRIDS THROUGH THE ...

The tortilla was placed in the fixture and pushed through the four screws. The
tortilla was screwed in using the bolts. As the test ran, the probe pushed through the
center of the tortilla. The maximum peak force values and distance values were recorded.
Color
Figure 4. Stretchability/Flexability test
for flour tortillas
A HunterLab MiniScan (Model MS/S-4000S, Hunter Associates Laboratory Inc.,
Reston, VA) was used to measure the color of the tortilla samples. “L”, “a”, and “b”
values were given as output. “L” was the measurement for lightness (0 = black and 100
= white). Red and green colors were indicated by the “a” value (+a = red and –a =
green). The “b” value indicated yellow (+b) and blue (-b) colors.
The device was calibrated with a light trap and white tile provided by Hunter
Associates Laboratory Inc. The type of illuminant used was C, average daylight, with a
10 o Standard Observer.
pH
A Fisher Scientific Accumet portable pH/mV/Ion meter (Model AP63, Thermo
Fisher Scientific, Inc. Waltham, MA) with a glass pH electrode was used to attain pH
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