Abstract
The effect of moisture, temperature and addition of monoglycerides (MG) on the extrusion behaviour of maize grits was studied using laboratory (MPF-19) and pilot scale (MPF-50) extruders, which were operated under conditions of scale up by throughput and die size. The extruder responses of pressure, torque and SME and the extrudate properties of expansion and water solubility and absorption indices were measured and compared in the two scales of extruder. Die pressure and torque (expressed as a percentage of maximum) of the MPF-50 extruder were higher compared to those of the MPF-19 extruder; however, the reverse was true for SME, expansion and water solubility index of extrudates. However, the general applicability of these results may depend on feedstock particle size because of scale up of the screw-barrel gap.
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