One-pot ionic liquid pretreatment and saccharification of switchgrass

Literature Information

Publication Date 2013-07-09
DOI 10.1039/C3GC40545A
Impact Factor 10.182
Authors

Noppadon Sathitsuksanoh, Pavan Kambam, Lucas Sandoval, Debjani Mitra, Sonny Zhang


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Abstract

Biomass pretreatment using certain ionic liquids (ILs), such as 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]), can be highly effective at reducing the recalcitrance of lignocellulosic biomass to enzymatic degradation. However, current commercial enzyme cocktails, derived from filamentous fungi and developed for dilute acid pretreatment, are inhibited by the most effective ILs used for pretreatment and require excessive amounts of water to remove the ILs from biomass after pretreatment in order to be effective. The associated IL recycling and waste disposal costs of this process pose significant economic and process engineering challenges for the commercial scale-up of IL pretreatment-based technologies. For the first time, we have demonstrated a one-pot, wash-free process that combines IL pretreatment and saccharification into a single vessel. After treating the switchgrass with [C2mim][OAc] and dilution with water to a final IL concentration of 10–20%, the pretreatment slurry was directly hydrolyzed using a thermostable IL tolerant enzyme cocktail previously developed at the Joint BioEnergy Institute (JBEI). This one-pot process liberated 81.2% glucose and 87.4% xylose (monomers and oligomers) at 72 h at 70 °C with an enzyme loading of 5.75 mg g−1 of biomass at 10% [C2mim][OAc]. Glucose and xylose were selectively separated by liquid–liquid extraction with over 90% efficiency, thus eliminating extensive water washing as a unit operation. This study opens avenues for developing more efficient and cost effective processes for product recovery and IL recycling.

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Green Chemistry provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on, but not limited to, the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998). Green chemistry is the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry is at the frontiers of this continuously-evolving interdisciplinary science and publishes research that attempts to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. Submissions on all aspects of research relating to the endeavour are welcome. The journal publishes original and significant cutting-edge research that is likely to be of wide general appeal. To be published, work must present a significant advance in green chemistry. Papers must contain a comparison with existing methods and demonstrate advantages over those methods before publication can be considered. For more information please see this Editorial. Coverage includes the following, but is not limited to: Design (e.g. biomimicry, design for degradation/recycling/reduced toxicity…) Reagents & Feedstocks (e.g. renewables, CO2, solvents, auxiliary agents, waste utilization…) Synthesis (e.g. organic, inorganic, synthetic biology…) Catalysis (e.g. homogeneous, heterogeneous, enzyme, whole cell…) Process (e.g. process design, intensification, separations, recycling, efficiency…) Energy (e.g. renewable energy, fuels, photovoltaics, fuel cells, energy storage, energy carriers…) Applications (e.g. electronics, dyes, consumer products, coatings, pharmaceuticals, preservatives, building materials, chemicals for industry/agriculture/mining…) Impact (e.g. safety, metrics, LCA, sustainability, (eco)toxicology…) Green chemistry is, by definition, a continuously-evolving frontier. Therefore, the inclusion of a particular material or technology does not, of itself, guarantee that a paper is suitable for the journal. To be suitable, the novel advance should have the potential for reduced environmental impact relative to the state of the art. Green Chemistry does not normally deal with research associated with 'end-of-pipe' or remediation issues.

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