Physical properties of direct expansion extruded snack in utilization from Thai brown rice

Abstract

Thai brown rice from two varieties (Patumthani 1 and Supanburi 1) were investigated for basic raw materials in the production of direct expansion extruded snack by twin screw extruder at varying feed moisture (13, 15 and 17%) and screw speed (250, 300 and 350 rpm) in a 3 × 3 factorial in randomized complete block design. Results indicated that main factor (feed moisture or screw speed) had significant effect on physical properties of extrudates by showing that reducing feed moisture or increasing screw speed provided more expandable extrudate with higher expansion ratio, lower bulk density, higher water solubility index and broad peak in texture measurements, which similar results in both varieties of brown rice. The appropriate brown rice extruded snack which operating at feed moisture, 13% and screw speed, 350 rpm achieved acceptable product with nutritious in pattern of nutrition labeling.