Lignin from Tree Barks: Chemical Structure and Valorization

• DOI: 10.1002/cssc.202000431
• Publication Date: 2020-05-12T09:49:38Z
• Authors: Duarte M. Neiva; Jorge Rencoret; Gisela Marques; Ana Gutiérrez; Jorge Gominho; Helena Pereira; José C. del Río
• Keywords: Eucalyptus globulus

Abstract Lignins from different tree barks, including Norway spruce ( Picea abies ), eucalyptus Eucalyptus globulus mimosa Acacia dealbata ) and blackwood acacia A. melanoxylon are thoroughly characterized. The lignin E. bark is found to be enriched in syringyl (S) units, with lower amounts of guaiacyl (G) p ‐hydroxyphenyl (H) units (H/G/S ratio 1:26:73), which produces a that highly β‐ether linkages (83 %), whereas those the two barks have similar compositions ≈5:50:45), predominance β‐ethers (73–75 %) condensed carbon–carbon linkages; also includes some resorcinol‐related compounds, appear incorporated or intimately associated polymer. P. G H (H/G 14:86); this thus depleted β‐O‐4′ alkyl–aryl ether (44 linkages. Interestingly, contains large hydroxystilbene glucosides seem integrally into structure. This study indicates lignins can seen as an interesting source valuable phenolic compounds. Moreover, useful for tailoring conversion technologies deconstruction valorization.