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Structural characterization of milled wood lignins from different eucalypt species
- Rencoret, Jorge (author)
- Marques, Gisela (author)
- Gutierrez, Ana (author)
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- Ibarra, David (author)
- Santos, J. Ignacio (author)
- Jimenez-Barbero, Jesus (author)
- Martinez, Angel T. (author)
- del Rio, Jose C. (author)
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- (creator_code:org_t)
- 2008-07-22
- 2008
- English.
- In: Holzforschung. - : Walter de Gruyter GmbH. - 0018-3830 .- 1437-434X. ; 62:5, s. 514-526
- Journal article (peer-reviewed)
Abstract
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- 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 yielded information about relative abundances of inter-unit linkages in the whole polymer. All the lignins showed a predominance of beta-O-4' ether linkages (66-72% of total side-chains), followed by beta-beta' resinol-type linkages (16-19%) and lower amounts of beta-5' phenylcoumarin-type (3-7%) and beta-1' spirodienone-type linkages (1-4%). The analysis of desulfurated 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 beta-beta' dimers included two syringyl units indicating that most of the beta-beta' 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 beta-beta' syringaresinol substructure attached to a guaiacyl unit through a 4-O-5' linkage.
Keyword
- 2D-NMR
- desulfuration
- dimers
- eucalypt wood
- Eucalyptus dunnii
- Eucalyptus globulus
- Eucalyptus grandis
- Eucalyptus maidenii
- Eucalyptus nitens
- heteronuclear single quantum correlation (HSQC)
- milledwood lignin (MWL)
- pyrolysis-GC/MS
- thioacidolysis
- trimers
- pyrolysis-gas chromatography
- nuclear-magnetic-resonance
- nmr-spectroscopy
- chemical-structure
- technical lignins
- hardwood
- lignins
- tree variation
- py-gc/ms
- globulus
- delignification
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- ref (subject category)
- art (subject category)
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- Rencoret, Jorge
- Marques, Gisela
- Gutierrez, Ana
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