Extrusion-cooked wheat-soybean flours for pizza dough use

Abstract

Mixture of wheat with soybean represents an important calorie-protein source with good protein quality. The objective of this work was to evaluate pasting properties and water absorption of pre-cooked wheat-soybean (90:10) flours, which were extruded in different moistures (23%, 26% and 29%) and barrel temperatures (60ºC, 70ºC, 80ºC and 90ºC), for pizza dough ready for use with desirable sensory characteristics. The experiment used a Brabender single screw extruder with constant feeding rates of 3.6 kg h^-1, constant screw-speed of 90 rpm and a laminar shape die of 1 mm. Pasting properties of pre-cooked mixed flours and barrel temperature increased simultaneously, presenting higher values at 26% moisture. Also water absorption increased together with moisture and barrel temperature. Pizza with the extruded mixed flour, prepared at 23% moisture and 80°C barrel temperature, presented the best sensory characteristics.