Scanning UV microspectrophotometry as a tool to study the changes of lignin in hydrothermally modified wood
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Bruno Andersons
, Guna Noldt
Abstract
Thermal modification (TM) of wood has occupied a relatively narrow but stable niche as an alternative for chemical wood protection. There are different technological solutions for TM and not all details of their effects on wood tissue have been understood. The one-stage hydrothermal modification (HTM) at elevated vapour pressure essentially changes the wood’s composition and structure. In the present paper, the changes in three hardwood lignins (alder, aspen, and birch) were observed within the cell wall by means of cellular UV microspectrophotometry. The lignin absorbances in the compound middle lamella (CML) of unmodified wood are 1.7- to 2.0-fold higher than those in the fibre S2 layer. The woods were modified in the temperature range from 140 to 180°C, while in the lower temperature range (140°C/1 h), the UV absorbances are little affected. Essential changes occur in the range of 160–180°C and the UV data reflect these by absorbtion changes, while the absorbances at 278 nm rise with factors around 2 more in the S2 layer than in the CML. The absorbance increments are interpreted as polycondensation reactions with furfural and other degradation products of hemicelluloses with the lignin moiety of the cell wall.
Acknowledgments
The authors gratefully acknowledge the financial support by the Latvian State Research Programme NatProd.
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©2016 by De Gruyter
Articles in the same Issue
- Frontmatter
- Original Articles
- Acid hydrolysis of O-acetyl-galactoglucomannan in a continuous tube reactor: a new approach to sugar monomer production
- Preparation and characterization of activated carbon fibers from liquefied wood by KOH activation
- Water vapour sorption of wood modified by acetylation and formalisation – analysed by a sorption kinetics model and thermodynamic considerations
- Scanning UV microspectrophotometry as a tool to study the changes of lignin in hydrothermally modified wood
- Assessing the wood quality of interior spruce (Picea glauca × P. engelmannii): variation in strength, relative density, microfibril angle, and fiber length
- Inverse determination of thermal conductivity in lumber based on genetic algorithms
- Influence of hot-water extraction on ultrastructure and distribution of glucomannans and xylans in poplar xylem as detected by gold immunolabeling
- Mode of action of brown rot decay resistance in phenol-formaldehyde-modified wood: resistance to Fenton’s reagent
- Stilbene impregnation retards brown-rot decay of Scots pine sapwood
- Negative gravitropism of Ginkgo biloba: growth stress and reaction wood formation
Articles in the same Issue
- Frontmatter
- Original Articles
- Acid hydrolysis of O-acetyl-galactoglucomannan in a continuous tube reactor: a new approach to sugar monomer production
- Preparation and characterization of activated carbon fibers from liquefied wood by KOH activation
- Water vapour sorption of wood modified by acetylation and formalisation – analysed by a sorption kinetics model and thermodynamic considerations
- Scanning UV microspectrophotometry as a tool to study the changes of lignin in hydrothermally modified wood
- Assessing the wood quality of interior spruce (Picea glauca × P. engelmannii): variation in strength, relative density, microfibril angle, and fiber length
- Inverse determination of thermal conductivity in lumber based on genetic algorithms
- Influence of hot-water extraction on ultrastructure and distribution of glucomannans and xylans in poplar xylem as detected by gold immunolabeling
- Mode of action of brown rot decay resistance in phenol-formaldehyde-modified wood: resistance to Fenton’s reagent
- Stilbene impregnation retards brown-rot decay of Scots pine sapwood
- Negative gravitropism of Ginkgo biloba: growth stress and reaction wood formation