Inhomogeneities in the Chemical Structure of Spruce Lignin
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H. Önnerud
Summary
Thioacidolysis, periodate oxidation and size exclusion chromatography (SEC) were used for the analysis of spruce lignin samples. The standard thioacidolysis method was modified by including a pre-swelling of the lignocellulosic sample before the reaction, and this gave a higher yield of monomer products. Middle lamella and compression wood lignin was found to contain a larger amount of oligomers after thioacidolysis than normal wood lignin. Analysis by thioacidolysis of a thermomechanical pulp (TMP) revealed that approximately 10% of the β-O-4 structures in the lignin were cleaved due to the mechanical grinding effect. From kraft pulp, the mixture of thioacidolysis products contains a major fraction having a considerably larger molecular mass than the products from spruce wood and TMP. The structure of this material is still unknown.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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- Nanoparticles for the Controlled Release of Fungicides in Wood: Soil Jar Studies Using G.Trabeum and T. Versicolor Wood Decay Fungi
- Wood Essential Oils of Juniperus foeticissima Willd
- Structure Elucidation of Condensed Tannins from Barks by Pyrolysis/ Gas Chromatography
- A Density Functional Theory Study of Coniferyl Alcohol Intermonomeric Cross Linkages in Lignin - Three-Dimensional Structures, Stabilities and the Thermodynamic Control Hypothesis
- Inhomogeneities in the Chemical Structure of Spruce Lignin
- Application of ESR Spectroscopy in Bleaching Studies
- Ozone Bleaching of Atmospheric Acetic Acid Hardwood Pulp from Betula platyphylla var. japonica Hara
- Relationship Between Growth Stress, Mechanical-Physical Properties and Proportion of Fibre with Gelatinous Layer in Chestnut (Castanea Sativa Mill.)
- Cambial Growth of Swietenia macrophylla King Studied under Controlled Conditions by High Resolution Laser Measurements
- Selected Properties of Parallel Strand Lumber Made from Southern Pine and Yellow-Poplar
- Effects of Cell Structure on Water Sorption for Wood
- Moisture Dynamics in Norway Spruce and Scots Pine during Outdoor Exposure in Relation to Different Surface Treatments and Handling Conditions
- Book Review/Literature Reports/Addendum
Articles in the same Issue
- Evidence of the Degradation of Middle Lamella in a Waterlogged Archaeological Wood
- Molecular Identity of Species and Isolates of Internal Pore Fungi Antrodia spp. and Oligoporus placenta
- Performance of Waterborne Cu(II) Octanoate/Ethanolamine Wood Preservatives
- Nanoparticles for the Controlled Release of Fungicides in Wood: Soil Jar Studies Using G.Trabeum and T. Versicolor Wood Decay Fungi
- Wood Essential Oils of Juniperus foeticissima Willd
- Structure Elucidation of Condensed Tannins from Barks by Pyrolysis/ Gas Chromatography
- A Density Functional Theory Study of Coniferyl Alcohol Intermonomeric Cross Linkages in Lignin - Three-Dimensional Structures, Stabilities and the Thermodynamic Control Hypothesis
- Inhomogeneities in the Chemical Structure of Spruce Lignin
- Application of ESR Spectroscopy in Bleaching Studies
- Ozone Bleaching of Atmospheric Acetic Acid Hardwood Pulp from Betula platyphylla var. japonica Hara
- Relationship Between Growth Stress, Mechanical-Physical Properties and Proportion of Fibre with Gelatinous Layer in Chestnut (Castanea Sativa Mill.)
- Cambial Growth of Swietenia macrophylla King Studied under Controlled Conditions by High Resolution Laser Measurements
- Selected Properties of Parallel Strand Lumber Made from Southern Pine and Yellow-Poplar
- Effects of Cell Structure on Water Sorption for Wood
- Moisture Dynamics in Norway Spruce and Scots Pine during Outdoor Exposure in Relation to Different Surface Treatments and Handling Conditions
- Book Review/Literature Reports/Addendum
