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Lignolytic Bacteria, lignin degradation, lignin valorization, inhibitors

Abstract

Lignin, a crucial component of lignocellulosic biomass, represents a rich source of naturally occurring aromatic compounds. Traditionally, it is obtained as a by-product in pulp and paper industries and biorefineries. However, its enormous potential remains underexploited as most large-scale industrial  processes that use plant polysaccharides from lignocellulose usually burn lignin for energy generation. In the last years, more attention has been given to transforming lignin into value added-products including fuels, chemicals and materials. Nevertheless, utilizing lignin as a fermentation medium can  be challenging, as it can inhibit the growth of bacteria. Moreover, there is a lack of information regarding the lignin degradation pathway as well as studies on the tolerance of lignin derivative compounds by various bacteria. Based on that, the present study aimed to assess and comprehend the  degradation pathway as well as the inhibitory effect of lignin derivative compounds on three distinct lignolytic bacterial strains: Oceanimonas doudoroffii, Pseudomonas alloputida (commonly known as Pseudomonas putida KT2440), and Cupriavidus necator DSM545. The results revealed that all the  tested strains were able to utilize lignin derivative compounds as a sole carbon source at different concentrations. This opens up new opportunities for using lignin in higher value applications. By enhancing our understanding of lignin degradation pathways and the inhibitory effects of lignin derivative  compounds on bacteria, this study contributes to the advancement of sustainable methods for converting lignin into high-value products, thereby fostering the development of a circular and sustainable economy.

Acknowledgement

This work was supported by the Novo Nordisk Foundation, Denmark (grant number: NNF20SA0066233) and by a full scholarship from the Royal Thai Government (grant number: 88141).

References

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  • Lee, S., Kang, M., Bae, J.-H., Sohn, J.-H., & Sung, B. H. (2019). Bacterial Valorization of Lignin: Strains, Enzymes, Conversion Pathways, Biosensors, and Perspectives. Frontiers in Bioengineering and Biotechnology, 7. https://doi.org/10.3389/fbioe.2019.00209