Corn distillers' dried grains with solubles (DDGS) was first extruded with corn meals in plastic recycling machine a good pilot plant single-screw extruder at different extruder die temperature ranges (100, 120, and 150C), levels of DDGS (0, 10, 20, and 30%) and preliminary moisture contents (11, 15, and 20% wb). Generally, there was a decrease in normal water absorption index (WAI), water solubility index (WSI), radial expansion, and L* worth with a rise in DDGS level, whereas a* value and bulk density increased. Increase in extruder die temperature resulted in an increase in WSI and WAI but a decrease in L* and mass density. Peak load was highest at 30% DDGS in comparison with 0, 10, and 20% DDGS extrudates. Die heat of 120C and initial moisture content of 20% led to least peak load. The a* benefit remained unaffected by improvements in extruder die temperature. Radial growth was highest at extruder die temperatures of 120C. Optimum WAI, WSI, radial growth, and L* benefit were obtained at 15% initial moisture content. An increase in initial moisture content material, in general, decreased L* value and mass density but raised a* value of extrudates.
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December 2015
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