Comprehensive Study on the Chemical Structure of Dioxane Lignin from Plantation Eucalyptus globulus Wood

Citations Over TimeTop 10% of 2001 papers

Abstract

Results of a comprehensive study on the chemical structure of lignin from plantation Eucalyptus globulus Labill are presented. Lignin has been isolated by a modified mild acidolysis method and thoroughly characterized by functional group analysis, by a series of degradation techniques (nitrobenzene oxidation, permanganate oxidation, thioacidolysis, and Py-GC-MS), and (1)H and (13)C NMR spectroscopy. Plantation Eucalyptus globulus lignin was found to be of the S/G type with an extremely high proportion of syringyl (S) units (82-86%) and a minor proportion of p-hydrophenyl propane (H) units (roughly 2-3 mol %). Unknown C-6 substituted and 4-O-5' type syringyl substructures represent about 65% of lignin "condensed" structures. Eucalypt lignin showed high abundance of beta-O-4 (0.56/C(6)) structures and units linked by alpha-O-4 bonds (0.23/C(6)). The proportion of phenylcoumaran structures was relatively low (0.03/C(6)). Different kinds of beta-beta substructures (pino-/syringaresinol and isotaxiresinol types) in a total amount of 0.13/C(6) were detected. ESI-MS analysis revealed a wide molecular weight distribution of lignin with the center of gravity of mass distribution around 2500 u.

Related Papers

• → Development of SCAR molecular markers for early and late differentiation of Eucalyptus globulus ssp globulus from E. globulus ssp maidenii(2012)6 cited
• Eucalyptus 'hybrid' - a new source of cineole.(1970)
• → Evidence for the existence of a natural hybridbetween Eucalyptus globulus and Eucalyptus ovata(1937)6 cited
• ESTABELECIMENTO IN VITRO DE CLONES HÍBRIDOS DE Eucalyptus globulus IN VITRO ESTABLISHMENT OF Eucalyptus globulus HYBRID CLONES(2012)
• → Eucalyptus bicostata x Eucalyptus globulus(2017)