Journal article
Effect of co-products of enzyme-assisted aqueous extraction of soybeans, enzymes, and surfactant on oil recovery from integrated corn-soy fermentation
Industrial crops and products, v 121, pp 441-451
01 Oct 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
•Effect of soy co-products on oil recovery from corn fermentation was evaluated.•Addition of soy co-products alone significantly increased oil partition in thin stillage.•Cellulase, pectinase and Fermgen® improved oil partition compared to Tween 80.•Corn-soy Distillers Dried Grains has higher protein and lower fiber content than corn.
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 ∼32 h decrease in fermentation time. Addition of soy co-products also resulted in ∼10–28% increase in oil partition in thin stillage with no additional enzyme or surfactant treatment. Addition of insoluble fiber alone resulted in ∼19% decrease in solids partition in thin stillage. Maximum free oil recovery, 22.5 ± 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, 67 ± 3.2%, was achieved with the enzyme treatment alone. Corn-soy DDG has ∼11% higher protein, ∼2% lower fiber, and ∼2% lower fat contents compared to corn DDG. The fiber content was further reduced to ∼2% 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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Details
- Title
- Effect of co-products of enzyme-assisted aqueous extraction of soybeans, enzymes, and surfactant on oil recovery from integrated corn-soy fermentation
- Creators
- Jasreen K. Sekhon - Drexel UniversityKurt A. Rosentrater - Iowa State UniversityStephanie Jung - California Polytechnic State UniversityTong Wang - Iowa State University
- Publication Details
- Industrial crops and products, v 121, pp 441-451
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Food and Hospitality Management
- Web of Science ID
- WOS:000437996900051
- Scopus ID
- 2-s2.0-85047383928
- Other Identifier
- 991019168871904721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Agricultural Engineering
- Agronomy