Abstract
Lignin is one of the three major components of lignocellulosic biomass. It is highly resistant to either chemical or biochemical degradation due to the presence of the ether and C–C linkages in its heterogeneous structure. In the early attempts to develop processes for the bioconversion of biomass to fuels and chemicals, lignin was considered as a waste by-product and burned to supply heat for internal uses. Recently, it has been realized that in order to make a biorefinery economically feasible, lignin must also be used as a feedstock for the production of high-value products, in addition to cellulose and hemicellulose. Processes for the bioconversion of lignin subsequently were developed. A typical lignin bioconversion process consists of three steps, which include depolymerization, funneling, and product formation. In the first step, depolymerizing enzymes are used to break down lignin to its monomer and oligomer units. These monomers and oligomers then are converted to metabolic intermediates by a process normally referred to as funneling. Finally, the intermediates, which can enter the central metabolism, are converted to the desired products by various microbial species in fermentation processes. This chapter discusses the recent developments in the bioconversion of lignin and the potential commercial products that can be made. The future research directions that are needed to develop a complete biorefinery, which includes a component for lignin bioconversion to high-value products, are also discussed.
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Nghiem, N.P. (2022). Biochemical Conversion of Lignin. In: Nghiem, N.P., Kim, T.H., Yoo, C.G. (eds) Biomass Utilization: Conversion Strategies. Springer, Cham. https://doi.org/10.1007/978-3-031-05835-6_5
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DOI: https://doi.org/10.1007/978-3-031-05835-6_5
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