Abstract
The morphology and chemical composition of the inner bark
of four willow hybrids were analyzed as a step toward
complete willow biomass valorization. The inner bark
consisted of highly delignified bundles of thick-walled
sclerenchyma fibers and nondelignified surrounding tissue
of thin-walled parenchyma cells. In comparison with
willow wood fibers, the sclerenchyma fibers were longer,
they had a very narrow lumen and their walls were made of
up to eight separate layers. One fourth of the dry mass
of the inner bark was formed of ash and acetone
extractable substances. Although the
lignin-to-polysaccharide ratio was similar in the inner
bark and wood, their polysaccharide compositions were
different. While glucose and xylose were the main
monomers in wood, the inner bark had also high arabinose
and galactose contents. In addition, more rhamnose was
present in the inner bark which was indicative of its
higher pectin content.
Original language | English |
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Pages (from-to) | 3871-3876 |
Journal | ACS Sustainable Chemistry & Engineering |
Volume | 4 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2016 |
MoE publication type | A1 Journal article-refereed |
Keywords
- acetone
- biomass
- chemical analysis
- fibers
- optical microscopy
- thin walled structures
- chemical characterization
- chemical compositions
- inner bark
- parenchyma cells
- pectin contents
- polysaccharide composition
- thick-walled
- willow biomass