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Structural characterization of milled wood lignin from different eucalypt species
Rencoret, Jorge et al.-- 13 pages, 7 figures, 6 tables, 49 references. ; The chemical structure of milled-wood lignins from Eucalyptus globulus, E. nitens, E. maidenii, E. grandis, and E. dunnii was investigated. The lignins were characterized by analytical pyrolysis, thioacidolysis and 2D-NMR that confirmed the predominance of syringyl over guaiacyl units and only showed traces of p-hydroxyphenyl units. E. globulus lignin had the highest syringyl content. The heteronuclear single quantum correlation (HSQC) NMR spectra gave information about relative abundances of inter-unit linkages in the whole polymer. All the lignins showed a predominance of β-O-4' ether linkages (66-72% of total side-chains), followed by β-β' resinol-type linkages (16-19%) and lower amounts of β-5' phenylcoumaran-type (3-7%) and β-1' spirodienone-type linkages (1-4%). The analysis of desulphurated thioacidolysis dimers provided additional information on the relative abundances of the various carbon-carbon and diaryl ether bonds, and the type of units (syringyl or guaiacyl) involved in each of the above linkage types. Interestingly, 93-94% of the total β-β' dimers included two syringyl units indicating that most of the β-β' substructures identified in the HSQC spectra were of the syringaresinol type. Moreover, three isomers of a major trimeric compound were found which were tentatively identified as arising from a β-β' syringaresinol substructure attached to a guaiacyl unit through a 4-O-5' linkage. ; This study has been funded by the Spanish project AGL2005-01748, the CSIC project 2006-4-0I-039 and the BIORENEW EU-Project (NMP2-CT-2006-026456). Javier Romero (ENCE, Pontevedra, Spain) is acknowledged for providing the wood samples. J.R. thanks the CSIC for a I3P fellowship and the COST Action E-41 for funding an stay at KTH; and GM thanks the Spanish MEC for a FPI fellowship. ; Peer reviewed
Structural characterization of milled wood lignin from different eucalypt species
Rencoret, Jorge et al.-- 13 pages, 7 figures, 6 tables, 49 references. ; The chemical structure of milled-wood lignins from Eucalyptus globulus, E. nitens, E. maidenii, E. grandis, and E. dunnii was investigated. The lignins were characterized by analytical pyrolysis, thioacidolysis and 2D-NMR that confirmed the predominance of syringyl over guaiacyl units and only showed traces of p-hydroxyphenyl units. E. globulus lignin had the highest syringyl content. The heteronuclear single quantum correlation (HSQC) NMR spectra gave information about relative abundances of inter-unit linkages in the whole polymer. All the lignins showed a predominance of β-O-4' ether linkages (66-72% of total side-chains), followed by β-β' resinol-type linkages (16-19%) and lower amounts of β-5' phenylcoumaran-type (3-7%) and β-1' spirodienone-type linkages (1-4%). The analysis of desulphurated thioacidolysis dimers provided additional information on the relative abundances of the various carbon-carbon and diaryl ether bonds, and the type of units (syringyl or guaiacyl) involved in each of the above linkage types. Interestingly, 93-94% of the total β-β' dimers included two syringyl units indicating that most of the β-β' substructures identified in the HSQC spectra were of the syringaresinol type. Moreover, three isomers of a major trimeric compound were found which were tentatively identified as arising from a β-β' syringaresinol substructure attached to a guaiacyl unit through a 4-O-5' linkage. ; This study has been funded by the Spanish project AGL2005-01748, the CSIC project 2006-4-0I-039 and the BIORENEW EU-Project (NMP2-CT-2006-026456). Javier Romero (ENCE, Pontevedra, Spain) is acknowledged for providing the wood samples. J.R. thanks the CSIC for a I3P fellowship and the COST Action E-41 for funding an stay at KTH; and GM thanks the Spanish MEC for a FPI fellowship. ; Peer reviewed
Structural characterization of milled wood lignin from different eucalypt species
Rencoret, Jorge (author) / Río Andrade, José Carlos del (author) / Marques, Gisela (author) / Gutiérrez Suárez, Ana (author) / Ibarra, David (author) / Santos, José Ignacio (author) / Jiménez-Barbero, Jesús (author) / Martínez, Ángel T. (author) / Ministerio de Economía y Competitividad (España) / Consejo Superior de Investigaciones Científicas (España)
2008-01-01
Article (Journal)
Electronic Resource
English
DDC:
690
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