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Journal article
Ethanol Production by Soy Fiber Treatment and Simultaneous Saccharification and Co-Fermentation in an Integrated Corn-Soy Biorefinery
Fermentation (Basel), v 4(2), p35
01 Jun 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Insoluble fiber (IF) recovered from the enzyme-assisted aqueous extraction process (EAEP) of soybeans is a fraction rich in carbohydrates and proteins. It can be used to enhance ethanol production in an integrated corn-soy biorefinery, which combines EAEP with traditional corn-based ethanol processing. The present study evaluated IF as a substrate for ethanol production. The effects of treatment of IF (soaking in aqueous ammonia (SAA), liquid hot water (LHW), and enzymatic hydrolysis), primarily simultaneous saccharification and co-fermentation (SSCF), as well as scaling up (250 mL to 60 L) on ethanol production from IF alone or a corn and IF slurry were investigated. Enzymatic hydrolysis (pectinase, cellulase, and xylanase, each added at 5% soy solids during simultaneous saccharification and fermentation/SSCF) was the best treatment to maximize ethanol production from IF. Ethanol yield almost doubled when SSCF of IF was performed with Saccharomyces cerevisiae and Escherichia coli KO11. Addition of IF in dry-grind corn fermentation increased the ethanol production rate (similar to 31%), but low ethanol tolerance of E. coli KO11 was a limiting factor for employing SSCF in combination corn and IF fermentation. Nonlinear Monod modeling accurately predicted the effect of ethanol concentration on E. coli KO11 growth kinetics by Hanes-Woolf linearization. Collectively, the results from this study suggest a potential of IF as a substrate, alone or in dry-grind corn fermentation, where it enhances the ethanol production rate. IF can be incorporated in the current bioethanol industry with no added capital investment, except enzymes.
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Details
- Title
- Ethanol Production by Soy Fiber Treatment and Simultaneous Saccharification and Co-Fermentation in an Integrated Corn-Soy Biorefinery
- Creators
- Jasreen K. Sekhon - Drexel Univ, Dept Culinary Arts & Food Sci, Philadelphia, PA 19131 USADevin Maurer - Iowa State Univ, Dept Agr & Biosyst Engn, Ames, IA 50011 USATong Wang - Iowa State Univ, Dept Food Sci & Human Nutr, Ctr Crops Utilizat Res, Ames, IA 50011 USAStephanie Jung - Iowa State Univ, Dept Food Sci & Human Nutr, Ctr Crops Utilizat Res, Ames, IA 50011 USAKurt A. Rosentrater - Iowa State Univ, Dept Agr & Biosyst Engn, Ames, IA 50011 USA
- Publication Details
- Fermentation (Basel), v 4(2), p35
- Publisher
- Mdpi
- Number of pages
- 18
- Grant note
- USDA National Institute of Food and Agriculture; United States Department of Agriculture (USDA)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Food and Hospitality Management
- Web of Science ID
- WOS:000436554400015
- Scopus ID
- 2-s2.0-85055911171
- Other Identifier
- 991019168617504721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Biotechnology & Applied Microbiology
- Food Science & Technology