Development of Nutritious Snack from rice industry waste using twin screw extrusion

¹ Assistant Professor, Deptt. of Applied Sciences, Bhai Gurdas Institute of Engineering & Technology, Sangrur, Punjab.
² Director & Professor, Deptt. of Food Technology, Bhai Gurdas Institute of Engineering & Technology, Sangrur, Punjab, India.
³ Professor, Deptt. of Food Engineering and Technology, Sant Longowal Institute of Engineering & technology, Longowal, Punjab, India.

^* Tanuja Srivastava: tanusriva@yahoo.co.in

Abstract

Deoiled rice bran, a byproduct of rice milling industry was transformed into highly nutritious snack by the application of twin screw extrusion process. Response Surface Methodology (RSM) with four- factor- five level central composite rotatable design (CCRD) was employed to investigate the effects of extrusion conditions including moisture content of different raw flours, feed composition, barrel temperature and screw speed of extruder on properties of extrudates was studied. Second order quadratic regression model fitted adequately in the variation. The significance was established at P ≤ 0.05. The regression models can be used to interpret the effect of feed composition, moisture content, screw speed and barrel temperature on the properties of the final product. It was shown that higher rice bran in feed composition showed in minimum water absorption index and maximum water solubility index. Numerical optimization technique resulted in 123.83°C of barrel temperature, 294.68 rpm of screw speed, 13.94 % of feed moisture and 17.73 % of deoiled rice bran. The responses predicted for these optimum process conditions resulted water absorption index, 5.91468 g/g and water solubility index of 18.5553 % for the development of value added product with health benefits.