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

Johansson, Sara LU ; Carlqvist, Karin LU ; Kataria, Rashmi; Ulvcrona, Thomas; Bergsten, Urban; Arshadi, Mehrdad; Galbe, Mats LU and Lidén, Gunnar LU (2015) In Wood Science and Technology 49(5). p.1037-1054
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Wood Science and Technology
volume
49
issue
5
pages
1037 - 1054
publisher
Springer
external identifiers
  • wos:000359383200011
  • scopus:84938742597
ISSN
1432-5225
DOI
10.1007/s00226-015-0739-3
language
English
LU publication?
yes
id
ffbeb1a1-3204-4ec7-84a3-542c49d1ec7a (old id 7972596)
date added to LUP
2015-09-24 08:03:24
date last changed
2017-01-01 06:26:33
@article{ffbeb1a1-3204-4ec7-84a3-542c49d1ec7a,
  abstract     = {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.},
  author       = {Johansson, Sara and Carlqvist, Karin and Kataria, Rashmi and Ulvcrona, Thomas and Bergsten, Urban and Arshadi, Mehrdad and Galbe, Mats and Lidén, Gunnar},
  issn         = {1432-5225},
  language     = {eng},
  number       = {5},
  pages        = {1037--1054},
  publisher    = {Springer},
  series       = {Wood Science and Technology},
  title        = {Implications of differences in macromolecular composition of stem fractions for processing of Scots pine},
  url          = {http://dx.doi.org/10.1007/s00226-015-0739-3},
  volume       = {49},
  year         = {2015},
}