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Characterization of DDGS Using Differential Scanning Calorimetry

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  RRV07147,  ASABE/CSBE North Central Intersectional Meeting. (doi: 10.13031/2013.24188) @2007
Authors:   Vyku Ganesan, Kurt A Rosentrater
Keywords:   DDGS, Distillers Dried Grains with Solubles, DSC, glass transition temperature

DDGS is one of the main coproducts obtained from corn dry grind ethanol processing. Cake formation/agglomeration in DDGS has been recognized as a major problem in its flowability and long term storage. In our previous studies, the physical and flow properties of DDGS were investigated using the Carr powder tester and Jenike shear testing. In addition to those, the surface characteristics of DDGS are very important, as these properties will impact the resulting flow behavior of DDGS during storage, handling, and transportation. These types of properties, however, have not been determined for DDGS. As a first step toward that, the objective of this study was to characterize the glass transition temperature of various DDGS samples using differential scanning calorimetry (DSC). The DDGS investigated included unmodified DDGS, reduced fat DDGS, de-waxed DDGS, and DDG. The glass transition was observed to occur near 20oC for all the samples. The next step in this research will be to link glass transition temperature with other physical and flow properties.

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