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Characterization of Chemical and Physical Properties of Distillers Dried Grain with Solubles (DDGS) for Value Added Uses

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

Citation:  2007 ASAE Annual Meeting  077009.(doi:10.13031/2013.22861)
Authors:   Rumela Bhadra, K Muthukumarappan, Kurt. A. Rosentrater
Keywords:   Chemical properties, coproducts, DDG, DDGS, DWG, ethanol, fiber, NMR spectroscopy, physical properties

One of the fastest growing industries in the United States is the fuel ethanol industry. Since 2000 there has been an increase of more than 300%. There was production of 4.9 billion gallons of ethanol in 2006. The major coproducts from this industry include Distillers Dried Grains with Solubles (DDGS) and carbon dioxide. DDGS is used as a livestock feed since it contains high quantities of protein, fiber, amino acids, and other nutrients. The goal of this study was to quantify various chemical and physical properties of DDGS, Distillers Wet Grains (DWG), and Distillers Dried Grain (DDG) from several plants in South Dakota during fall and winter 2006-2007. Chemical properties included crude ash, Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF), crude fiber (CF), crude protein, crude fat and total starch content in each of the samples. Physical properties included moisture content, water activity, bulk density, thermal properties, color (L*, a*, b*) and angle of repose. We also conducted image analysis and particle size determination of the DDGS. The carbon groups in the DDGS samples were determined using NMR spectroscopy. Results from this study showed several possibilities for using DDGS as alternatives other than animal feed. Possibilities include degrading it with suitable enzymes and producing additional ethanol, producing value added compounds, using it as human food additives, or even using as inert fillers for biocomposites.

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