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An “ideal lignin” for biorefineries
BRC Science Highlight An “ideal lignin” for biorefineries Objective Investigate whether catechyl lignin (C-lignin),which is essentially a homopolymer, may actually be an “ideal lignin” for biomass processing. Approach Conduct a revised compositional characterization of the recently discovered C-lignin present in seedcoats of vanilla, and determine C-lignin’s reactivity and stability. Attempt to convert the C-lignin polymer to monomers in near-quantitative yield, using hydrogenolysis. Results/Impacts Upon acid treatments, C-lignin retained its key structural features and had little change in its molecular weight distribution, indicating that C-lignin does not suffer from unwanted condensation reactions. Due to C-lignin’s stability, traditional lignin chemical degradation methods are ineffective on C-lignin. However, essentially all of the C-lignin polymer was depolymerized to monomeric catechol compounds during hydrogenolysis. Our study provides a new perspective for the production of catechols from a renewable biomass source rather than petroleum; thus, we suggest that continuing to pursue the engineering of C-lignins in planta is a worthwhile endeavor. Hydrogenolysis monomer yields, from different catalyst and solvent combinations. Yields are on a C-lignin molar basis. Li, Y. et al. “An “ideal lignin” facilitates full biomass utilization.” Science Advances 4, eaau2968 (2018) [DOI: /sciadv.aau2968]. GLBRC September 2018
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