Recent Advances in the Chemistry of Eucalyptus Wood
The chemical characteristics of the woods from several eucalypt hybrids from the Brazilian Genolyptus program were studied. The analyses of the lipophilic extractives indicated a similar composition in all eucalypt hybrids, which were dominated by sitosterol, sitosterol esters and sitosteryl 3β-D-glucopyranoside that are responsible for pitch deposition during kraft pulping. The analysis indicated that the wood from U1xU2 presents the lowest amounts of these pitch-forming compounds. The composition and structure of the lignins were analyzed by 2D-NMR that indicated a predominance of syringyl (S) over guaiacyl (G) units and only traces of p-hydroxyphenyl (H) units in all woods, with the highest S/G ratio for G1xUGL. All the lignins showed a predominance of β-O-4' ether linkages (75-79% of total side-chains), followed by resinols (9-11%) and lower amounts of phenylcoumarans and spirodienones. The lignin from the hybrid G1xUGL also presented the highest proportion of β-O-4' linkages, and therefore, it is foreseen that the wood from this hybrid will be more easily delignifiable than the other selected Brazilian eucalypt hybrids.
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Format: | comunicación de congreso biblioteca |
Language: | English |
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Universidade Federal de Viçosa
2015-05-26
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Subjects: | Eucalyptus, Wood, Lignin, Lipids, Pulping, Bleaching, |
Online Access: | http://hdl.handle.net/10261/116003 |
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dig-irnas-es-10261-1160032020-11-13T13:29:44Z Recent Advances in the Chemistry of Eucalyptus Wood Río Andrade, José Carlos del Rencoret, Jorge Martínez, Ángel T. Colodette, Jorge Luiz Gutiérrez Suárez, Ana Eucalyptus Wood Lignin Lipids Pulping Bleaching The chemical characteristics of the woods from several eucalypt hybrids from the Brazilian Genolyptus program were studied. The analyses of the lipophilic extractives indicated a similar composition in all eucalypt hybrids, which were dominated by sitosterol, sitosterol esters and sitosteryl 3β-D-glucopyranoside that are responsible for pitch deposition during kraft pulping. The analysis indicated that the wood from U1xU2 presents the lowest amounts of these pitch-forming compounds. The composition and structure of the lignins were analyzed by 2D-NMR that indicated a predominance of syringyl (S) over guaiacyl (G) units and only traces of p-hydroxyphenyl (H) units in all woods, with the highest S/G ratio for G1xUGL. All the lignins showed a predominance of β-O-4' ether linkages (75-79% of total side-chains), followed by resinols (9-11%) and lower amounts of phenylcoumarans and spirodienones. The lignin from the hybrid G1xUGL also presented the highest proportion of β-O-4' linkages, and therefore, it is foreseen that the wood from this hybrid will be more easily delignifiable than the other selected Brazilian eucalypt hybrids. This study has been funded by the EU-project LIGNODECO (KBBE-244362), the Spanish project AGL2011-25379 (co-financed by FEDER funds), and the CSIC project 2014-40E-097. J.L. Colodette also thanks the National Council for Scientific and Technological Development (CNPq) for a research fellowship. No 2015-06-01T14:12:15Z 2015-06-01T14:12:15Z 2015-05-26 comunicación de congreso http://purl.org/coar/resource_type/c_5794 Proceedings of the 7th International Colloquium on Eucalyptus Pulp, 2015 http://hdl.handle.net/10261/116003 en #PLACEHOLDER_PARENT_METADATA_VALUE# KBBE-244362 Sí open Universidade Federal de Viçosa |
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Eucalyptus Wood Lignin Lipids Pulping Bleaching Eucalyptus Wood Lignin Lipids Pulping Bleaching |
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Eucalyptus Wood Lignin Lipids Pulping Bleaching Eucalyptus Wood Lignin Lipids Pulping Bleaching Río Andrade, José Carlos del Rencoret, Jorge Martínez, Ángel T. Colodette, Jorge Luiz Gutiérrez Suárez, Ana Recent Advances in the Chemistry of Eucalyptus Wood |
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The chemical characteristics of the woods from several eucalypt hybrids from the Brazilian Genolyptus program were studied. The analyses of the lipophilic extractives indicated a similar composition in all eucalypt hybrids, which were dominated by sitosterol, sitosterol esters and sitosteryl 3β-D-glucopyranoside that are responsible for pitch deposition during kraft pulping. The analysis indicated that the wood from U1xU2 presents the lowest amounts of these pitch-forming compounds. The composition and structure of the lignins were analyzed by 2D-NMR that indicated a predominance of syringyl (S) over guaiacyl (G) units and only traces of p-hydroxyphenyl (H) units in all woods, with the highest S/G ratio for G1xUGL. All the lignins showed a predominance of β-O-4' ether linkages (75-79% of total side-chains), followed by resinols (9-11%) and lower amounts of phenylcoumarans and spirodienones. The lignin from the hybrid G1xUGL also presented the highest proportion of β-O-4' linkages, and therefore, it is foreseen that the wood from this hybrid will be more easily delignifiable than the other selected Brazilian eucalypt hybrids. |
format |
comunicación de congreso |
topic_facet |
Eucalyptus Wood Lignin Lipids Pulping Bleaching |
author |
Río Andrade, José Carlos del Rencoret, Jorge Martínez, Ángel T. Colodette, Jorge Luiz Gutiérrez Suárez, Ana |
author_facet |
Río Andrade, José Carlos del Rencoret, Jorge Martínez, Ángel T. Colodette, Jorge Luiz Gutiérrez Suárez, Ana |
author_sort |
Río Andrade, José Carlos del |
title |
Recent Advances in the Chemistry of Eucalyptus Wood |
title_short |
Recent Advances in the Chemistry of Eucalyptus Wood |
title_full |
Recent Advances in the Chemistry of Eucalyptus Wood |
title_fullStr |
Recent Advances in the Chemistry of Eucalyptus Wood |
title_full_unstemmed |
Recent Advances in the Chemistry of Eucalyptus Wood |
title_sort |
recent advances in the chemistry of eucalyptus wood |
publisher |
Universidade Federal de Viçosa |
publishDate |
2015-05-26 |
url |
http://hdl.handle.net/10261/116003 |
work_keys_str_mv |
AT rioandradejosecarlosdel recentadvancesinthechemistryofeucalyptuswood AT rencoretjorge recentadvancesinthechemistryofeucalyptuswood AT martinezangelt recentadvancesinthechemistryofeucalyptuswood AT colodettejorgeluiz recentadvancesinthechemistryofeucalyptuswood AT gutierrezsuarezana recentadvancesinthechemistryofeucalyptuswood |
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