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Título:	Structural characterization of lignin in different eucalypt species
Autor:	Rencoret, Jorge CSIC ORCID; Marques, Gisela CSIC ORCID; Gutiérrez Suárez, Ana CSIC ORCID ; Ibarra, David CSIC ORCID; Santos, J. Ignacio; Jiménez-Barbero, Jesús CSIC ORCID; Martínez, Ángel T. CSIC ORCID ; Río Andrade, José Carlos del CSIC ORCID
Palabras clave:	Eucalyptus Lignin 2D NMR
Fecha de publicación:	26-ago-2008
Citación:	10th European Workshop on Lignocellulosics and Pulp, , pp. 344-347.
Resumen:	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. The HSQC-NMR spectra showed a predominance of β-O-4' ether linkages (66-72% of total side-chains), followed by β-β' resinol-type linkages (16-19% of side-chains) and lower amounts of β-5' phenylcoumaran-type (3-7% of side-chains) and β-1' spirodienone-type linkages (1-4% of side-chains). The analysis of desulphurated thioacidolysis dimers provided additional information on the carbon-carbon and diaryl ether bonds forming the most condensed moiety of the eucalypt lignins, and the type of units 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 tentatively identified as arising from a β-β' syringaresinol substructure attached to a guaiacyl unit through a 4-O-5' linkage were found.
Descripción:	Rencoret, Jorge et al.-- 4 páginas, 1 figura, 2 tablas, 12 referencias.-- Congreso celebrado del 26-29 de agosto 2008, en Stockholm, Sweden.
URI:	http://hdl.handle.net/10261/86378
Aparece en las colecciones:	(IRNAS) Comunicaciones congresos