The effect of switchgrass loadings on feedstock solubilization and biofuel production by Clostridium thermocellum

Verbeke, Tobin J.; Garcia, Gabriela M.; Elkins, James G.

doi:10.1186/s13068-017-0917-7

Title: The effect of switchgrass loadings on feedstock solubilization and biofuel production by Clostridium thermocellum

Journal Article · Thu Nov 30 00:00:00 EST 2017 · Biotechnology for Biofuels

DOI:https://doi.org/10.1186/s13068-017-0917-7· OSTI ID:1618690

Verbeke, Tobin J.; Garcia, Gabriela M.; Elkins, James G.

High solids loading fermentations are necessary for the industrialization of lignocellulosic ethanol. To date, only a few studies have investigated the effect of solids loadings on microorganisms of interest for consolidated bioprocessing (CBP). Here, the effect that various switchgrass loadings have on Clostridium thermocellum solubilization and bioconversion are investigated. C. thermocellum was grown for ten days on 10, 25 or 50 g/L switchgrass or Avicel at equivalent glucan loadings. Avicel was completely consumed at all loadings, but total cellulose solubilization decreased from 63% to 37% as switchgrass loadings increased from 10 g/L to 50 g/L. Washed, spent switchgrass could be additionally hydrolyzed and fermented in second-round fermentations suggesting access to fermentable substrates was not the limiting factor at higher feedstock loadings. Fermentations of Avicel or cellobiose using culture medium supplemented with 50% spent fermentation broth identified that compounds present in the samples collected from the 25 or 50 g/L switchgrass loadings were the most inhibitory to continued fermentation. Finally, recalcitrance alone cannot fully account for differences in solubilization and end-production formation between switchgrass and Avicel at increased substrate loadings. Effort to decouple metabolic inhibition from inhibition of hydrolysis suggest that C. thermocellum’s hydrolytic machinery is more vulnerable to inhibition from switchgrass-derived inhibitors than is the bacterium’s metabolism.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: PS02-06ER64304; AC05-00OR22725

OSTI ID:: 1618690

Alternate ID(s):: OSTI ID: 1413625

Journal Information:: Biotechnology for Biofuels, Journal Name: Biotechnology for Biofuels Vol. 10 Journal Issue: 1; ISSN 1754-6834

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 13 works

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Title: The effect of switchgrass loadings on feedstock solubilization and biofuel production by Clostridium thermocellum

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