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Wood Research and Technology

Holzforschung

Cellulose – Hemicelluloses – Lignin – Wood Extractives

Editor-in-Chief: Faix, Oskar

Editorial Board: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / Salmen, Lennart / Sixta, Herbert / Vuorinen, Tapani / Argyropoulos, Dimitris S. / Balakshin, Yu / Barnett, J. R. / Burgert, Ingo / Rio, Jose C. / Evans, Robert / Evtuguin, Dmitry V. / Frazier, Charles E. / Fukushima, Kazuhiko / Gindl-Altmutter, Wolfgang / Glasser, W. G. / Holmbom, Bjarne / Isogai, Akira / Kadla, John F. / Koch, Gerald / Lachenal, Dominique / Laine, Christiane / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Potthast, Antje / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Sipilä, Jussi / Takano, Toshiyuki / Tamminen, Tarja / Theliander, Hans / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi

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1437-434X
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Volume 60, Issue 2

Issues

The influence of lignin chemistry and ultrastructure on the pulping efficiency of clonal aspen (Populus tremuloides Michx.)

Jaclyn J. Stewart
  • Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC, Canada
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ John F. Kadla
  • Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC, Canada
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Shawn D. Mansfield
  • Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC, Canada
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2006-03-07 | DOI: https://doi.org/10.1515/HF.2006.019

Abstract

The variation in wood chemistry among aspen clones of similar age, harvested from a common site in northern British Columbia, Canada, was evaluated. The aspen clones were evaluated for ease of chemical pulping and differed by as much as 4.5% in pulp yield at a common H-factor. The results demonstrate both the need for understanding the resource and the substantial opportunities that exists in natural population of trees for selecting superior clones for reforestation and afforestation. The syringyl/guaiacyl ratio, as determined by nitrobenzene oxidation, was directly correlated with the ease of pulping, whereas thioacidolysis results were not as predictive. These results were supported by quantitative NMR analysis, which demonstrated differences in the amount of β-O-4/Ar groups and the degree of condensation. Furthermore, it was shown that, in addition to total lignin content, which differed by as much as 5%, structural differences in the lignin may influence pulping efficacy. Among the other parameters evaluated, the distribution of molecular mass and methoxyl content is relevant for pulping. More specifically, among the fractions isolated in this study [milled wood lignin (MWL), MWELsol, and MWELinsol], the insoluble fraction was the most indicative of the pulping efficiency.

Keywords: aspen; delignification; guaiacyl lignin; kraft pulping; lignin; molecular mass; MWL; MWELsol; MWELinsol; NMR; nitrobenzene oxidation; quantitative NMR; syringyl lignin; thioacidolysis

About the article

Corresponding author. Shawn D. Mansfield, Department of Wood Science, Faculty of Forestry, University of British Columbia, Vancouver, BC, Canada V6T 1Z4 Tel.: +1-604-822-0196 Fax: +1-604-822-9104


Received: December 5, 2005

Accepted: December 23, 2005

Published Online: 2006-03-07

Published in Print: 2006-03-01


Citation Information: Holzforschung, Volume 60, Issue 2, Pages 111–122, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/HF.2006.019.

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