Impact of ionic liquid pretreated plant biomass on Saccharomyces cerevisiae growth and biofuel production

  • Ouellet M
  • Datta S
  • Dibble D
 et al. 
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Inhibitory compounds generated by the pretreament of lignocellulose
processes can have negative impacts on downstream microbial growth and
biofuel production. As such they present a significant barrier to the
commercialization of biofuels produced using renewable carbon sources.
Inhibitors are derived from the transformation of monosaccharides into
toxic compounds and can also be an intrinsic component of the
pretreatment reagents or biomass. Ionic liquid ( IL) pretreatment has
recently received attention as a potential alternative to established
pretreatment techniques, but there are no published studies on its
impact on downstream processes. In this study, sugars produced through
the enzymatic hydrolysis of biomass pretreated with the IL
1-ethyl-3-methylimidazolium acetate ({[}C(2)mim]{[}OAc]) were used to
assess the impact of IL pretreatment on cell growth and production of
ethanol by Saccharomyces cerevisiae. Residual
1-ethyl-3-methylimidazolium ion ({[}C(2)mim](+)) in hydrolysates was
found to be the primary source of inhibition on downstream microbial
growth and ethanol production.

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  • Mario Ouellet

  • Supratim Datta

  • Dean C. Dibble

  • Pramila R. Tamrakar

  • Peter I. Benke

  • Chenlin Li

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