Wood Science and Technology

, Volume 49, Issue 5, pp 1037–1054 | Cite as

Implications of differences in macromolecular composition of stem fractions for processing of Scots pine

  • Sara Johansson
  • Karin Carlqvist
  • Rashmi Kataria
  • Thomas Ulvcrona
  • Urban Bergsten
  • Mehrdad Arshadi
  • Mats Galbe
  • Gunnar LidénEmail author


Use of wood feedstocks for sugar-based biorefineries requires suitable treatments of the various tree fractions to optimize yields. In the current study, stem wood fractions (sapwood, heartwood and knotwood) were sampled at different heights from well-documented Scots pine trees taken from two contrasting stands. The fractions were assessed in terms of chemical composition, response to SO2-catalysed steam pretreatment and enzymatic digestibility. There were significant differences in total extractive contents between the fractions, where the heartwood fractions had an extractive content 1–3 wt% higher than sapwood (corresponding to a relative increase of 20–60 %) for samples at the same height. In contrast, the differences in macromolecular carbohydrate contents between the fractions were smaller and mainly insignificant. One exception was the xylan content, which was higher in heartwood than in sapwood at the same tree height (a relative difference of 10–15 %). Steam pretreatment resulted in a clearly higher degree of hydrolysis for sapwood than for heartwood at the same conditions. However, at optimal pretreatment temperatures a higher total sugar yield was in fact obtained for heartwood, showing the importance of tuning the process conditions for the respective wood fractions.


Lignin Xylose Hemicellulose Glucan Furfural 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors are grateful for financial support from the Bo Rydin Foundation for Scientific Research to the project TALLRAFF.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Sara Johansson
    • 1
  • Karin Carlqvist
    • 1
  • Rashmi Kataria
    • 2
  • Thomas Ulvcrona
    • 2
    • 3
  • Urban Bergsten
    • 2
  • Mehrdad Arshadi
    • 2
  • Mats Galbe
    • 1
  • Gunnar Lidén
    • 1
    Email author
  1. 1.Department of Chemical EngineeringLund UniversityLundSweden
  2. 2.Department of Forest Biomaterials and TechnologySwedish University of Agricultural SciencesUmeåSweden
  3. 3.SCA Skog ABUmeåSweden

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