Abstract
The economic viability of the biorefinery concept is limited by the valorization of lignin. One possible method of lignin valorization is biological upgrading with aromatic-catabolic microbes. In conjunction, lignin monomers can be produced by fast pyrolysis and fractionation. However, biological upgrading of these lignin monomers is limited by low water solubility. Here, we address the problem of low water solubility with an emulsifier blend containing approximately 70 wt% Tween® 20 and 30 wt% Span® 80. Pseudomonas putida KT2440 grew to an optical density (OD600) of 1.0 ± 0.2 when supplied with 1.6 wt% emulsified phenolic monomer-rich product produced by fast pyrolysis of red oak using an emulsifier dose of 0.076 ± 0.002 g emulsifier blend per g of phenolic monomer-rich product. This approach partially mitigated the toxicity of the model phenolic monomer p-coumarate to the microbe, but not benzoate or vanillin. This study provides a proof of concept that processing of biomass-derived phenolics to increase aqueous availability can enhance microbial utilization.
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Funding for this research was provided by Iowa State University’s Bioeconomy Institute, and NSF Energy for Sustainability, award number CBET-1605034. This work was also authored in part by Alliance for Sustainable Energy, LLC, the manager and operator of the National Renewable Energy Laboratory for the U.S. Department of Energy (DOE) under Contract no. DE-AC36-08GO28308. Funding to DS and GTB was provided by the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Technologies Office.
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Davis, K., Rover, M.R., Salvachúa, D. et al. Promoting microbial utilization of phenolic substrates from bio-oil. J Ind Microbiol Biotechnol 46, 1531–1545 (2019). https://doi.org/10.1007/s10295-019-02208-z
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DOI: https://doi.org/10.1007/s10295-019-02208-z