Inhomogeneities in the Chemical Structure of Hardwood Lignins
-
Summary
Bauer-McNett fractions of an aspen chemi-thermomechanical pulp showed a significant variation with respect to lignin content and sugar composition, and two of the fractions were found to be particularly rich in middle lamella and secondary wall material, respectively. The secondary wall lignin of aspen was found to contain larger amounts of non-condensed β-O-4 aryl ether structures than the middle lamella lignin and the difference was attributed to a larger amount of syringyl structures as revealed by thioacidolysis. Size exclusion chromatography of the thioacidolysis products from birch and spruce wood showed a larger part of lignin oligomers being present in the degraded spruce lignin. Moreover, birch lignin had a lower phenolic content than both aspen and spruce lignin. Thioacidolysis followed by Raney-nickel desulphuration was used for the analysis of hardwood lignin trimers.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- Editorial
- Post-Harvest Chemical Staining in Blackwood (Acacia melanoxylon R. Br.)
- Albino Strains of Ophiostoma Species for Biological Control of Sapstaining Fungi
- Presence of a Distinct S3 Layer in Mild Compression Wood Tracheids of Pinus radiata
- A Method to Estimate Fibre Length Distribution in Conifers Based on Wood Samples from Increment Cores
- Inhomogeneities in the Chemical Structure of Hardwood Lignins
- Molecular Modeling of Lignin β-O-4 Model Compounds. Comparative Study of the Computed and Experimental Conformational Properties for a Guaiacyl β-O-4 Dimer
- Kraft Green Liquor Pretreatment of Softwood Chips. Part III: Lignin Chemical Modifications
- The Role of Ferulic Acid Removal during Bleaching of Wheat Straw Mechanical Pulp with Peroxygen Reagents
- Surface Fractal Dimensionality and Hygroscopicity for Heated Wood
- Evaluation of the Microclimate in a Stored Softwood Chip Pile for Biopulping
- Wettability of Heat-Treated Wood
- The Relationship between Longitudinal Growth Strain, Tree Form and Tension Wood at the Stem Periphery of Ten- to Eleven-Year-Old Eucalyptus globulus Labill.
- Effects of Thermal Conductivity Data on Accuracy of Modeling Heat Transfer in Wood
- Detection of the Fracture Path under Tensile Loads through in situ Tests in an ESEM Chamber
- Properties of Southern Pine Wood Impregnated with Styrene
- Takayoshi Higuchi 75 Years Old
- Literature Reports
Articles in the same Issue
- Editorial
- Post-Harvest Chemical Staining in Blackwood (Acacia melanoxylon R. Br.)
- Albino Strains of Ophiostoma Species for Biological Control of Sapstaining Fungi
- Presence of a Distinct S3 Layer in Mild Compression Wood Tracheids of Pinus radiata
- A Method to Estimate Fibre Length Distribution in Conifers Based on Wood Samples from Increment Cores
- Inhomogeneities in the Chemical Structure of Hardwood Lignins
- Molecular Modeling of Lignin β-O-4 Model Compounds. Comparative Study of the Computed and Experimental Conformational Properties for a Guaiacyl β-O-4 Dimer
- Kraft Green Liquor Pretreatment of Softwood Chips. Part III: Lignin Chemical Modifications
- The Role of Ferulic Acid Removal during Bleaching of Wheat Straw Mechanical Pulp with Peroxygen Reagents
- Surface Fractal Dimensionality and Hygroscopicity for Heated Wood
- Evaluation of the Microclimate in a Stored Softwood Chip Pile for Biopulping
- Wettability of Heat-Treated Wood
- The Relationship between Longitudinal Growth Strain, Tree Form and Tension Wood at the Stem Periphery of Ten- to Eleven-Year-Old Eucalyptus globulus Labill.
- Effects of Thermal Conductivity Data on Accuracy of Modeling Heat Transfer in Wood
- Detection of the Fracture Path under Tensile Loads through in situ Tests in an ESEM Chamber
- Properties of Southern Pine Wood Impregnated with Styrene
- Takayoshi Higuchi 75 Years Old
- Literature Reports
