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Lignin Structures in Normal and Compression Wood. Evaluation by Thioacidolysis Using Ethanethiol and Methanethiol
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H. Önnerud
Published/Copyright:
June 1, 2005
Summary
The chemical structure of lignin in normal and compression wood of spruce has been studied. Thioacidolysis using both methanethiol and ethanethiol as nucleophiles was used for degradation. The results showed that these nucleophiles work equally well in thioacidolysis, but that methanethiol gives a somewhat higher yield than ethanethiol. In spruce compression wood, several of the monomeric, dimeric and trimeric products were structurally elucidated using gas chromatography-mass spectrometry analysis of the desulphurated thioacidolysis products. Some of the oligomeric structures contained a p-hydroxyphenyl unit, but most of the material seemed to be present in non-condensed β-O-4 structures. A catechol structure was found and the results also indicated the presence of β-5 stilbene structures in native spruce lignin.
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Published Online: 2005-06-01
Published in Print: 2003-06-26
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Topochemical Characterisation of Phenolic Extractives in Discoloured Beechwood (Fagus sylvatica L.)
- Detection and Species Identification of Wood-Decaying Fungi by Hybridization of Immobilized Sequence-Specific Oligonucleotide Probes with PCR-Amplified Fungal Ribosomal DNA Internal Transcribed Spacers
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- Phenolic and Lipophilic Extractives in Scots Pine Knots and Stemwood
- Chemical Characterisation of Wood of Roman Ships Brought to Light in the Recently Discovered Ancient Harbour of Pisa (Tuscany, Italy)
- Lignin Structures in Normal and Compression Wood. Evaluation by Thioacidolysis Using Ethanethiol and Methanethiol
- Lignin-Carbohydrate Condensation Product Formation in a Biomimetic Model Pulp Bleaching System
- Viscoelastic Behaviour of Wood Fibres during the Hot Pressing of Medium Density Fibreboard
- Measuring Relative Fibre Length in Scots Pine by Non-Destructive Wood Sampling
- Modelling Log-End Cracks Due to Growth Stresses: Calculation of the Elastic Energy Release Rate
- Modeling Ovendry Softwood Resistivity Based on the Resistor Network Theory
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- Wood-Derived Porous Ceramics via Infiltration of SiO2-Sol and Carbothermal Reduction
- Manufacture of Fiberboard from Wood Fibers Activated with Fentons Reagent (H2O2/FeSO4)
