Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8879935 | Industrial Crops and Products | 2018 | 11 Pages |
Abstract
Integrated corn-soy fermentation, utilizing co-products of soybean enzyme-assisted aqueous extraction process (EAEP) of soybeans in corn fermentation, has shown potential for enhancing bioethanol production compared to corn only fermentation. To maximize economic returns, oil may be recovered. In the present study, the effect of skim and insoluble fiber, and oil extraction aids on ethanol yield, oil partition, and oil recovery, and quality of Distillers Dried Grains (DDG) was investigated. Two fiber hydrolyzing enzymes (pectinase and cellulase), an acid protease (Fermgen®), and a surfactant (Tween 80) were evaluated. Addition of skim, mixture of skim and insoluble fiber, or Fermgen® to corn fermentation resulted in a â¼32â¯h decrease in fermentation time. Addition of soy co-products also resulted in â¼10-28% increase in oil partition in thin stillage with no additional enzyme or surfactant treatment. Addition of insoluble fiber alone resulted in â¼19% decrease in solids partition in thin stillage. Maximum free oil recovery, 22.5â¯Â±â¯4.5%, was achieved from corn-insoluble fiber thin stillage with a combined treatment of enzymes (pectinase, cellulase, and Fermgen®) and surfactant (Tween 80). Maximum extractable oil recovery, 67â¯Â±â¯3.2%, was achieved with the enzyme treatment alone. Corn-soy DDG hasââ¼11% higher protein, â¼2% lower fiber, and â¼2% lower fat contents compared to corn DDG. The fiber content was further reduced to â¼2% after enzyme treatment. This study demonstrates an efficient use of soy EAEP co-products and enzymes to maximize oil partition in thin stillage, and produce a high quality corn-soy DDG.
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Authors
Jasreen K. Sekhon, Kurt A. Rosentrater, Stephanie Jung, Tong Wang,