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http://dx.doi.org/10.3746/jkfn.2013.42.11.1848

Effects of Die Temperature and CO2 Gas Injection on Physical Properties of Extruded Brown Rice-Vegetable Mix  

Gil, Sun-Kook (Dept. of Food Science and Technology, Kongju National University)
Ryu, Gi-Hyung (Dept. of Food Science and Technology, Kongju National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.42, no.11, 2013 , pp. 1848-1856 More about this Journal
Abstract
This study is designed to examine the change in physical properties of extruded brown rice-vegetable mix at different temperatures and $CO_2$ gas injections. Moisture content and screw speed were fixed to 27% and 100 rpm respectively. Die temperatures and $CO_2$ gas injections were adjusted to 60, 80, $100^{\circ}C$ and 0, 150 mL/min, respectively. The ratio of ${\alpha}$-brown rice, brown rice and sugars (oligosaccharides and palatinose) was fixed to 25, 50 and 16%, respectively. Green tea, tomato and pumpkin powder were blended individually at 9%. Specific mechanical energy (SME) input decreased as die temperature for each vegetable addition increased. All extrudates decreased in density and breaking strength, but increased in specific length and water soluble index as $CO_2$ gas injection increased. Elastic modulus decreased as the die temperature and $CO_2$ gas injection increased. Extruded green tea mix with $CO_2$ gas injection at 150 mL/min was larger pore size and higher amount of pore than the tomato and pumpkin extrudates with $CO_2$ gas injection. Cold extrusion with $CO_2$ gas injection at $60^{\circ}C$ die temperature could be applicable for making Saengsik (uncooked food).
Keywords
cold extrusion; $CO_2$ gas injection; die temperature; SME input; expansion index;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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