Abstract
The objective of this work was to study the techno-functional properties of alkalineextruded Cuzco corn flour (HMEA) obtained by Ca(OH)2 addition in the extrusion process and to compare it with those of corn flour obtained by a traditional extrusion process (HME). The native meal was conditioned at moistures of 30, 35, 40 and 45% (w/w) and extruded in a single-screw extruder at 80 °C. For alkaline extrusion, 0.25 g of Ca(OH)2 100 g of flour was added. The addition of Ca(OH)2 in the extrusion process significantly affected the techno-functional properties of HMEA by increasing the solubility index (WSI), decreasing the water absorption index (WAI) and oil retention capacity (ORC) withrespect to those of HME. The alkaline treatment decreased the degree of gelatinization with respect to HMEA, obtaining values between 31.80 and 57.90% and increasing the initial gelatinization temperature from 69 to 73 °C. The gel firmness of the treated flours ranged from 0.26 to 0.33 N and 0.50 to 0.77 N for HMEA and HME respectively. Alkaline extrusion modifies the techno-functional properties of cuzco corn flour by reducing itswater absorption and controlling the degree of gelatinization, obtaining flours with an intermediate cooking degree.
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