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Effect of Decortication of Sorghum on Ethanol Production and Composition of DDGS

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

Citation:  Paper number  056137,  2005 ASAE Annual Meeting . (doi: 10.13031/2013.19582) @2005
Authors:   D.Y. Corredor, S.R Bean, T. Schober, D. Wang
Keywords:   Ethanol, fermentation, sorghum, decortication process, DDGS

Pretreatment technologies have been developed to increase the bioconversion rate for both starch and cellulosic-based biomass. This study investigated the effect of decortication as a pretreatment method on ethanol production from sorghum as well as its impact on distillers dry grains with solubles (DDGS) quality. Eight sorghum hybrids with 0, 10, and 20% of their outer layer removed were used as raw materials for ethanol production. The decorticated samples were fermented to ethanol by using Saccharomyces cerevisiae. Removal of germ and fiber prior to fermentation allowed for a higher starch loading for ethanol fermentation and resulted in increased ethanol production. The ethanol yields increased as the percentage of decortication increased. The decortication process resulted in DDGS with higher protein content and lower fiber content, which may improve the feed quality.

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