Anisotropy of cell wall polymers in branches of hardwood and softwood: a polarized FTIR study |
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Authors: | Jasna Simonović Jasna Stevanic Daniela Djikanović Lennart Salmén Ksenija Radotić |
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Institution: | (1) Institute for Multidisciplinary Research, Kneza Višeslava 1, 11000 Belgrade, Serbia;(2) Innventia, Box 5604, 114 86 Stockholm, Sweden; |
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Abstract: | The mechanical and physical properties of wood fibres are dependent on the organisation of their constituent polymers (cellulose,
hemicellulose and lignin). Fourier Transform Infrared (FTIR) microscopy was used to examine the anisotropy of the main wood
polymers in isolated cell wall fragments from branches of maple and Serbian spruce. Polarised FTIR measurements indicated
an anisotropy, i.e. orientation of the cellulose microfibrils that was more or less parallel to the longitudinal axis of the
cell wall. The hemicelluloses, glucomannan and xylan appeared to have a close link to the orientation of the cellulose and,
thus, an orientation more parallel to the axis of the cell wall. An important result is that, in both maple and spruce samples,
lignin was found to be organised in a parallel way in relation to the longitudinal cell wall axis, as well as to the cellulose.
The results show that, despite the different lignin precursors and the different types of hemicelluloses in these two kinds
of wood, lignin has a similar orientation, when it comes to the longitudinal axis of the cell wall. |
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