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Structural characte...
Structural characterization of milled wood lignins from different eucalypt species
- Article/chapterEnglish2008
Publisher, publication year, extent ...
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2008-07-22
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Walter de Gruyter GmbH,2008
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-17799
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-17799URI
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https://doi.org/10.1515/hf.2008.096DOI
Supplementary language notes
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Language:English
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Summary in:English
Part of subdatabase
Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20100525
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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.
Subject headings and genre
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2D-NMR
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desulfuration
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dimers
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eucalypt wood
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Eucalyptus dunnii
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Eucalyptus globulus
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Eucalyptus grandis
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Eucalyptus maidenii
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Eucalyptus nitens
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heteronuclear single quantum correlation (HSQC)
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milledwood lignin (MWL)
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pyrolysis-GC/MS
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thioacidolysis
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trimers
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pyrolysis-gas chromatography
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nuclear-magnetic-resonance
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nmr-spectroscopy
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chemical-structure
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technical lignins
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hardwood
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lignins
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tree variation
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py-gc/ms
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globulus
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delignification
Added entries (persons, corporate bodies, meetings, titles ...)
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Marques, Gisela
(author)
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Gutierrez, Ana
(author)
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Ibarra, David
(author)
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Li, JiebingKTH,Träkemi och massateknologi(Swepub:kth)u1rxxt8l
(author)
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Gellerstedt, GöranKTH,Träkemi och massateknologi(Swepub:kth)u1pqzekk
(author)
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Santos, J. Ignacio
(author)
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Jimenez-Barbero, Jesus
(author)
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Martinez, Angel T.
(author)
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del Rio, Jose C.
(author)
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KTHTräkemi och massateknologi
(creator_code:org_t)
Related titles
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In:Holzforschung: Walter de Gruyter GmbH62:5, s. 514-5260018-38301437-434X
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- By the author/editor
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Rencoret, Jorge
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Marques, Gisela
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Gutierrez, Ana
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Ibarra, David
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Li, Jiebing
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Gellerstedt, Gör ...
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show more...
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Santos, J. Ignac ...
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Jimenez-Barbero, ...
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Martinez, Angel ...
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del Rio, Jose C.
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- Articles in the publication
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Holzforschung
- By the university
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Royal Institute of Technology