Syed Zameer Hussain

Cooking behaviour of re-fabricated rice as affected by extrusion: A response surface analysis

The effect of feed moisture, screw speed and barrel temperature on cooking characteristics of re-fabricated rice grains was investigated in a co-rotating twin-screw extruder using response surface methodology. The rice flour obtained from broken rice (< 1/8th of actual kernel size) of PR-116 after mixing with structural components was used in the study. The screw speed was set at five levels between 49 and 150 rpm, barrel temperature between 59 and 110°C and feed moisture between 31 and 45%. All cooking parameters of the re-fabricated rice grains evaluated—Kernel length before cooking (KLBC), kernel length after cooking (KLAC), volume expansion ratio (VER), water uptake (WU) and cooking coefficient (CC) –were significantly (P<0.01) affected by the three process variables. Barrel temperature was the most significant variable with quadratic effect on KLAC and WU. Response surface regression models were established to correlate the cooking parameters of re-fabricated rice grains to the process variables. The optimized extrusion conditions for preparation of re-fabricated grains were 38% moisture content, 130 rpm screw speed and 89°C barrel temperature. Understanding the effect of process variables on the cooking properties and optimization of extrusion conditions was deemed useful for the development of re-fabricated rice.

Physical Properties of Refabricated Rice as Affected by Extrusion: A Response Surface Analysis

The aim of this study was to optimize the extrusion conditions for production of refabricated rice using a response surface modeling approach. The effects of feed moisture content, screw speed, and barrel temperature on the physical properties of rice grains refabricated using a corotating twin-screw extruder were investigated. Rice flour (variety PR-116) obtained from broken grains (smaller than one-eighth of a whole grain) was used in the study. Screw speeds at five levels between 49 and 150 rpm, barrel temperatures between 59 and 110°C, and feed moisture contents between 31 and 45% were tested. All of the physical properties of the refabricated rice grains that were evaluated (thousand kernel weight, length/breadth ratio, bulk density, and breaking strength) were significantly (P < 0.01) affected by these three process variables. Response surface regression models were established to correlate the physical properties of refabricated rice grains to the process variables. Understanding the effects of pro...

Functional Properties of Re-fabricated Rice as Affected by Die During Extrusion Process

Abstract In order to obtain re-fabricated rice with properties similar to natural rice, a special cutter and six dies were designed and evaluated. All the dimensional and physical properties of re-fabricated rice were significantly affected by die type. The average values of all the properties studied increased with the increase in moisture content (from 10 to 14%), except length/breadth ratio and porosity which decreased with the increase in moisture content. Based on the dimensional and physical properties, the re-fabricated rice obtained through die IV (8 × 1.5 mm) was in close resemblance to natural rice (PR-116). In general, uncooked and cooked re-fabricated rice grains showed significantly harder and firm texture in comparison to natural rice. Furthermore, significant differences were observed with respect to colour, whiteness and translucence between re-fabricated rice samples and natural rice. Sensory evaluation data revealed significant decrease in oral tenderness and adhesiveness in re-fabricated rice against natural rice. The study demonstrated that appropriate design of extrusion die is determinant factor for developing re-fabricated rice with properties similar to natural rice.

Study on colour coordinates and maillard precursors of re-fabricated rice

The effect of feed moisture, screw speed and barrel temperature on colour coordinates of re-fabricated rice grains were investigated in a co-rotating twin-screw extruder using response surface methodology. The rice flour obtained from broken rice (< 1/8th was used in the study. The screw speed was set at five levels between 49 and 150 rpm, barrel temperature between 59 and 110°C and feed moisture between 31 and 45%. All colour coordinates of re-fabricated grains evaluated (total colour difference) and hue angle were significantly affected by the three process variables. Barrel temperature was the most significant variable with quadratic effect on a*. Response surface regression models were established to correlate the colour coordinates of refabricated rice grains to the process variables. The optimized extrusion conditions for preparation of re-fabricated grains were 38%, moisture content, 130 rpm screw speed and 89°C barrel temperature. A significant change was observed in maillard precursors i.e. sucrose, glucose, fructose and maltose levels of re-fabricated rice obtained at optimum extrusion

Effect of Extrusion Conditions on Pasting Behavior and Microstructure of Refabricated Rice: A Response Surface Analysis

ABSTRACT The effects of moisture, screw speed, and barrel temperature on pasting behavior of refabricated rice grains were investigated in a corotating twin-screw extruder with response surface methodology. The rice flour obtained from broken rice (≤1/8 of actual kernel size) of PR-116 variety was used in the study. The screw speed was set at five levels between 49 and 150 rpm, barrel temperature between 59 and 110°C, and feed moisture between 31 and 45%. All pasting properties of refabricated grains evaluated—peak viscosity, hold viscosity, breakdown viscosity, final viscosity, and setback viscosity—were significantly (P < 0.01) affected by the three process variables. Barrel temperature was the most significant variable, with quadratic effect on all viscosity parameters. Response surface regression models were established to correlate the viscosity profile of refabricated rice grains to the process variables. The optimum moisture content, screw speed, and barrel temperature estimated by a response surfa...