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Integration of Pretreatment With Simultaneous Counter-Current Extraction of Energy Sorghum for High-Titer Mixed Sugar Production
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, United States.DOE Great Lakes Bioenergy Research Center, Michigan State University, Madison, MI, United States.
DOE Great Lakes Bioenergy Research Center, Michigan State University, Madison, MI, United States.Department of Chemical Engineering, Michigan Technological University, Houghton, MI, United States.
DOE Great Lakes Bioenergy Research Center, Michigan State University, Madison, MI, United States.Department of Biochemistry & Biophysics, Texas A&M University, College Station, TX, United States.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering. Department of Chemical & Biological Engineering, Montana State University, Bozeman, MT, United States.ORCID iD: 0000-0002-9313-941x
2019 (English)In: Frontiers in Energy Research, E-ISSN 2296-598X, Vol. 6, article id 133Article in journal (Refereed) Published
Abstract [en]

Sorghum (Sorghum bicolor L. Moench) offers substantial potential as a feedstock for the production of sugar-derived biofuels and biochemical products from cell wall polysaccharides (i.e., cellulose and hemicelluloses) and water-extractable sugars (i.e., glucose, fructose, sucrose, and starch). A number of preprocessing schemes can be envisioned that involve processes such as sugar extraction, pretreatment, and densification that could be employed in decentralized, regional-scale biomass processing depots. In this work, an energy sorghum exhibiting a combination of high biomass productivity and high sugar accumulation was evaluated for its potential for integration into several potential biomass preprocessing schemes. This included counter-current extraction of water-soluble sugars followed bymild NaOH or liquid hot water pretreatment of the extracted bagasse. A novel processing scheme was investigated that could integrate with current diffuser-type extraction systems for sugar extraction. In this approach, mild NaOH pretreatment (i.e., < 90 degrees C) was performed as a counter-current extraction to yield both an extracted, pretreated bagasse and a high-concentration mixed sugar stream. Following hydrolysis of the bagasse, the combined hydrolysates derived from cellulosic sugars and extractable sugars were demonstrated to be fermentable to high ethanol titers (> 8%) at high metabolic yields without detoxification using a Saccharomyces cerevisiae strain metabolically engineered and evolved to ferment xylose.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2019. Vol. 6, article id 133
Keywords [en]
sorghum, sucrose extraction, decentralized biorefining, pretreatment, cellulosic biofuels
National Category
Bioprocess Technology
Research subject
Biochemical Process Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-74648DOI: 10.3389/fenrg.2018.00133ISI: 000467003700001OAI: oai:DiVA.org:ltu-74648DiVA, id: diva2:1326376
Note

Validerad;2019;Nivå 2;2019-06-18 (johcin)

Available from: 2019-06-18 Created: 2019-06-18 Last updated: 2019-07-02Bibliographically approved

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