1-17: Thermophilic enrichment of microbial communities in the presence of 1-ethyl, 3-methyimidizolium acetate 

Tuesday, May 1, 2012
Napoleon Ballroom C-D, 3rd fl (Sheraton New Orleans)
Christopher W. Simmons1, Amitha P. Reddy1, Lauren K. Jabusch1, Joshua T. Claypool1, Steven W. Singer2, Blake A. Simmons2 and Jean S. VanderGheynst1, (1)Biological and Agricultural Engineering, University of California, Davis, Davis, CA, (2)Deconstruction Division, Joint Bioenergy Institute, Emeryville, CA
There is a need for ionic-liquid tolerant microorganisms and enzymes that efficiently deconstruct lignocellulose in a thermophilic and high-solids environment.  High-solids incubations were completed  to enrich for thermophilic microbial communities that decompose switchgrass in the presence of the ionic liquid 1-Ethyl, 3-methyimidizolium acetate (IL).  Ionic liquid levels were increased from 0 to 6% on a total weight basis in successive high-solids enrichments.  Successful enrichment of a microbial community that decomposed lignocellulose at 55C in the presence of 6wt% IL was identified in enrichments in which IL increased from 2wt% to 4wt% to 6wt%.  Pyrotag results from progressive enrichments revealed selection of specific bacterial species that are promising sources of novel lignocellulolytic enzymes tolerant to the stresses of pretreated biomass.
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