Ultra-structural organisation of cell wall polymers in normal and tension wood of aspen revealed by polarisation FTIR microspectroscopy |
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Authors: | Anne-Mari?Olsson Ingela?Bjurhager Lorenz?Gerber Bj?rn?Sundberg Email author" target="_blank">Lennart?SalménEmail author |
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Institution: | 1.Innventia,Stockholm,Sweden;2.Department of Fiber and Polymer Technology,Royal Institute of Technology (KTH),Stockholm,Sweden;3.Ume? Plant Science Center, Department of Forest Genetics and Plant Physiology,Swedish University of Agricultural Sciences (SLU),Ume?,Sweden |
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Abstract: | Polarisation Fourier transform infra-red (FTIR) microspectroscopy was used to characterize the organisation and orientation
of wood polymers in normal wood and tension wood from hybrid aspen (Populus tremula × Populus tremuloides). It is shown that both xylan and lignin in normal wood are highly oriented in the fibre wall. Their orientation is parallel
with the cellulose microfibrils and hence in the direction of the fibre axis. In tension wood a similar orientation of lignin
was found. However, in tension wood absorption peaks normally assigned to xylan exhibited a 90° change in the orientation
dependence of the vibrations as compared with normal wood. The molecular origin of these vibrations are not known, but they
are abundant enough to mask the orientation dependence of the xylan signal from the S2 layer in tension wood and could possibly come from other pentose sugars present in, or associated with, the gelatinous layer
of tension wood fibres. |
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