Identification of Inhibitors in Lignocellulosic Slurries and Determination of Their Effect on Hydrocarbon-Producing Microorganisms

Philip Pienkos, Mary Franden, Yat Chou, Min Zhang, Qing Yang, Shihui Yang

Research output: Contribution to journalArticlepeer-review

18 Scopus Citations

Abstract

The aim of this work was to identify inhibitors in pretreated lignocellulosic slurries, evaluate high-throughput screening strategies, and investigate the impact of inhibitors on potential hydrocarbon-producing microorganisms. Compounds present in slurries that could inhibit microbial growth were identified through a detailed analysis of saccharified slurries by applying a combination of approaches of high-performance liquid chromatography, GC-MS, LC-DAD-MS, and ICP-MS. Several high-throughput assays were then evaluated to generate toxicity profiles. Our results demonstrated that Bioscreen C was useful for analyzing bacterial toxicity but not for yeast. AlamarBlue reduction assay can be a useful high-throughput assay for both bacterial and yeast strains as long as medium components do not interfere with fluorescence measurements. In addition, this work identified two major inhibitors (furfural and ammonium acetate) for three potential hydrocarbon-producing bacterial species that include Escherichia coli, Cupriavidus necator, and Rhodococcus opacus PD630, which are also the primary inhibitors for ethanologens. This study was strived to establish a pipeline to quantify inhibitory compounds in biomass slurries and high-throughput approaches to investigate the effect of inhibitors on microbial biocatalysts, which can be applied for various biomass slurries or hydrolyzates generated through different pretreatment and enzymatic hydrolysis processes or different microbial candidates.

Original languageAmerican English
Article number23
Number of pages14
JournalFrontiers in Bioengineering and Biotechnology
Volume6
Issue numberAPR
DOIs
StatePublished - 2018

Bibliographical note

Publisher Copyright:
© 2018 Yang, Franden, Yang, Chou, Zhang and Pienkos.

NREL Publication Number

  • NREL/JA-5100-71459

Keywords

  • Acetate
  • Furfural
  • High-throughput screening
  • Inhibitor
  • Saccharified slurry

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