title: Quantifying pretreatment degradation compounds in solution and accumulated by cells during solids and yeast recycling in the Rapid Bioconversion with Integrated recycling Technology process using AFEX™ corn stover.
abstract: Effects of degradation products (low molecular weight compounds produced during pretreatment) on the microbes used in the RaBIT (Rapid Bioconversion with Integrated recycling Technology) process that reduces enzyme usage up to 40% by efficient enzyme recycling were studied. Chemical genomic profiling was performed, showing no yeast response differences in hydrolysates produced during RaBIT enzymatic hydrolysis. Concentrations of degradation products in solution were quantified after different enzymatic hydrolysis cycles and fermentation cycles. Intracellular degradation product concentrations were also measured following fermentation. Degradation product concentrations in hydrolysate did not change between RaBIT enzymatic hydrolysis cycles; the cell population retained its ability to oxidize/reduce (detoxify) aldehydes over five RaBIT fermentation cycles; and degradation products accumulated within or on the cells as RaBIT fermentation cycles increased. Synthetic hydrolysate was used to confirm that pretreatment degradation products are the sole cause of decreased xylose consumption during RaBIT fermentations.
authors.affiliation: Biomass Conversion Research Laboratory (BCRL), Department of Chemical Engineering and Materials Science, Michigan State University, 3815 Technology Boulevard, Lansing, MI 48910, United States; DOE Great Lakes Bioenergy Research Center (GLBRC), Michigan State University, East Lansing, MI 48824, United States. Electronic address: sarkscor@egr.msu.edu.
authors.forename: Cory
authors.initials: C
authors.lastname: Sarks
authors.affiliation: DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI 53704, United States. Electronic address: ahigbee@glbrc.wisc.edu.
authors.forename: Alan
authors.initials: A
authors.lastname: Higbee
authors.affiliation: DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI 53704, United States. Electronic address: jpiotrowski@wisc.edu.
authors.forename: Jeff
authors.initials: J
authors.lastname: Piotrowski
authors.affiliation: Biomass Conversion Research Laboratory (BCRL), Department of Chemical Engineering and Materials Science, Michigan State University, 3815 Technology Boulevard, Lansing, MI 48910, United States; DOE Great Lakes Bioenergy Research Center (GLBRC), Michigan State University, East Lansing, MI 48824, United States. Electronic address: xuesaisi@egr.msu.edu.
authors.forename: Saisi
authors.initials: S
authors.lastname: Xue
authors.affiliation: Departments of Chemistry and Biomolecular Chemistry, University of Wisconsin-Madison, Madison, WI 53704, United States. Electronic address: jcoon@chem.wisc.edu.
authors.forename: Joshua J
authors.initials: JJ
authors.lastname: Coon
authors.affiliation: DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI 53704, United States. Electronic address: tksato@glbrc.wisc.edu.
authors.forename: Trey K
authors.initials: TK
authors.lastname: Sato
authors.affiliation: Biomass Conversion Research Laboratory (BCRL), Department of Chemical Engineering and Materials Science, Michigan State University, 3815 Technology Boulevard, Lansing, MI 48910, United States; DOE Great Lakes Bioenergy Research Center (GLBRC), Michigan State University, East Lansing, MI 48824, United States. Electronic address: jinmingj@egr.msu.edu.
authors.forename: Mingjie
authors.initials: M
authors.lastname: Jin
authors.affiliation: Biomass Conversion Research Laboratory (BCRL), Department of Chemical Engineering and Materials Science, Michigan State University, 3815 Technology Boulevard, Lansing, MI 48910, United States; DOE Great Lakes Bioenergy Research Center (GLBRC), Michigan State University, East Lansing, MI 48824, United States. Electronic address: balan@egr.msu.edu.
authors.forename: Venkatesh
authors.initials: V
authors.lastname: Balan
authors.affiliation: Biomass Conversion Research Laboratory (BCRL), Department of Chemical Engineering and Materials Science, Michigan State University, 3815 Technology Boulevard, Lansing, MI 48910, United States; DOE Great Lakes Bioenergy Research Center (GLBRC), Michigan State University, East Lansing, MI 48824, United States. Electronic address: bdale@egr.msu.edu.
authors.forename: Bruce E
authors.initials: BE
authors.lastname: Dale
mesh_terms: D056804:Biofuels; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D006868:Hydrolysis; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D014994:Xylose / Q000378:metabolism; D003313:Zea mays / Q000737:chemistry*
chemical_list: D056804:Biofuels; D000431:Ethanol; D014994:Xylose
keywords: AFEX™; Cell recycling; Cellulosic ethanol; Pretreatment degradation products; Saccharomyces cerevisiae