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Effect of Single‐Screw Extruder Die Temperature, Amount of Distillers' Dried Grains With Solubles (DDGS), and Initial Moisture Content on Extrudates
Author(s) -
Shukla C. Y.,
Muthukumarappan K.,
Julson J. L.
Publication year - 2005
Publication title -
cereal chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.558
H-Index - 100
eISSN - 1943-3638
pISSN - 0009-0352
DOI - 10.1094/cc-82-0034
Subject(s) - plastics extrusion , water content , chemistry , expansion ratio , absorption of water , die (integrated circuit) , moisture , extrusion , distillers grains , food science , composite material , materials science , geotechnical engineering , organic chemistry , engineering , nanotechnology
Corn distillers' dried grains with solubles (DDGS) was extruded with corn meal in a pilot plant single‐screw extruder at different extruder die temperatures (100, 120, and 150°C), levels of DDGS (0, 10, 20, and 30%) and initial moisture contents (11, 15, and 20% wb). In general, there was a decrease in water absorption index (WAI), water solubility index (WSI), radial expansion, and L * value with an increase in DDGS level, whereas a * value and bulk density increased. Increase in extruder die temperature resulted in an increase in WSI and WAI but a decrease in L * and bulk density. Peak load was highest at 30% DDGS as compared with 0, 10, and 20% DDGS extrudates. Die temperature of 120°C and initial moisture content of 20% resulted in least peak load. The a * value remained unaffected by changes in extruder die temperature. Radial expansion was highest at extruder die temperature of 120°C. Maximum WAI, WSI, radial expansion, and L * value were obtained at 15% initial moisture content. An increase in initial moisture content, in general, decreased L * value and bulk density but increased a * value of extrudates.