Screening of variables for extrusion of rice flour employing a Plackett-Burman design.

Manisha, Guha and Syed Zakiuddin, Ali. and Suvendu, Bhattacharya (2003) Screening of variables for extrusion of rice flour employing a Plackett-Burman design. Journal of Food Engineering, 57 (2). 135-144, 30 ref..

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Abstract

The existence of a large number of processing variables is a limitation for product development and process optimization in a number of food processes, including extrusion technology. The Plackett-Burman experimental design was applied to screen 10 extruder and extrusion variables during extrusion of rice flour, and the effect of these variables on the system parameters and target product parameters without using any die during expression were determined quantitatively. Variables studied included: extruder hardware variables such as mixing disk (MD) and reverse pitch screw element (RPSE); feed variables such as moisture, sugar, salt and amylose content of the feed and rice flour particle size; and extrusion operating variables such as barrel temp., feed rate and screw speed. System parameters determined were torque, specific mechanical energy and residence time, while target product parameters included bulk density, water solubility index and paste viscosity. Results showed that screw configuration, particularly the presence of MD and RPSE, imparts max. effect on extrusion and extrudate properties; marked effects were also obtained for amylose and moisture content, feed rate, screw speed and barrel temp. A combination of high barrel temp. in the presence of RPSE and MD using a low amylose content in feed was found to be desirable to achieve high water solubility index in the extruded product. It is concluded that an experimental design based on the Plackett-Burman theory can be applied efficiently to screen a large number of extrusion variables including discrete variables.

Item Type:	Article
Uncontrolled Keywords:	EXTRUSION-; RICE-; MODELLING-; RICE-FLOUR
Subjects:	600 Technology > 08 Food technology > 21 Cereals > 01 Rice 600 Technology > 08 Food technology > 05 Processing and Engineering
Divisions:	Food Engineering Grain Science and Technology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	05 Aug 2008 09:06
Last Modified:	12 Jun 2019 09:27
URI:	http://ir.cftri.res.in/id/eprint/7596

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