Startseite Chemical and ultrastructural changes in compound middle lamella (CML) regions of softwoods thermally modified by the Termovuoto process
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Chemical and ultrastructural changes in compound middle lamella (CML) regions of softwoods thermally modified by the Termovuoto process

  • Jie Gao , Jong Sik Kim , Nasko Terziev , Ottaviano Allegretti und Geoffrey Daniel EMAIL logo
Veröffentlicht/Copyright: 26. Februar 2014
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Abstract

Silver fir and Norway spruce wood have been thermally modified (TMW) for 3–4 h at 160°C, 180°C, 200°C, and 220°C by means of the thermovacuum process (Termovuoto), and the ultrastructural and chemical changes in the compound middle lamella (CML), including the middle lamella cell corner (MLcc) regions (CMLcc), were investigated. Severe anatomical and histochemical changes were prominent above treatment temperatures of 200°C; thus, woods treated at 220°C for 4 h were in focus. Immunocytochemical studies showed that noncellulosic polysaccharides, such as pectin, xyloglucan, xylan, and mannan, were significantly degraded in CMLcc regions of TMWs. After treatment, the CMLcc regions were composed almost entirely of modified lignin with increased amounts of acidic groups. With cytochemical staining for lignin, many electron dense particulates were detected in the CMLcc regions of TMWs, indicating early degradation/alteration by the Termovuoto treatment.


Corresponding author: Geoffrey Daniel, Wood Science, Department of Forest Products, Swedish University of Agricultural Sciences, P.O. Box 7008, SE-750 07 Uppsala, Sweden, e-mail:

Acknowledgments

The authors gratefully acknowledge funding provided by Formas projects 2009-582 and 2011-416.

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Received: 2013-11-16
Accepted: 2014-2-3
Published Online: 2014-2-26
Published in Print: 2014-10-1

©2014 by De Gruyter

Artikel in diesem Heft

  1. Frontmatter
  2. Original Articles
  3. Modeling of alkaline extraction chemistry and kinetics of softwood kraft pulp
  4. Synthesis and fundamental HSQC NMR data of monolignol β-glycosides, dihydromonolignol β-glycosides and p-hydroxybenzaldehyde derivative β-glycosides for the analysis of phenyl glycoside type lignin-carbohydrate complexes (LCCs)
  5. Iridoids from the stems of Viburnum erosum
  6. 6-Pentyl-α-pyrone as an anti-sapstain compound produced by Trichoderma gamsii KUC1747 inhibits the germination of ophiostomatoid fungi
  7. ESR studies on the free radical generation in wood by irradiation with selected sources from UV to IR wavelength regions
  8. Synthesis of aluminum hydroxide thin coating and its influence on the thermomechanical and fire-resistant properties of wood
  9. Lignin distribution in waterlogged archaeological Picea abies (L.) Karst degraded by erosion bacteria
  10. Assessment of covalent bond formation between coupling agents and wood by FTIR spectroscopy and pull strength tests
  11. Effect of hot water extracted hardwood and softwood chips on particleboard properties
  12. The interrelation between microfibril angle (MFA) and hygrothermal recovery (HTR) in compression wood and normal wood of Sugi and Agathis
  13. Chemical remediation of wood treated with micronised, nano or soluble copper preservatives
  14. Energetic investigation of the fatigue of wood
  15. Chemical and ultrastructural changes in compound middle lamella (CML) regions of softwoods thermally modified by the Termovuoto process
  16. Short Note
  17. Properties of young Araucaria heterophylla (Norfolk Island pine) reaction and normal wood
  18. Effect of specimen configuration on the measurement of off-axis logarithmic decrement of solid wood measured by longitudinal and flexural vibration tests
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