Abstract
Because plant cell walls vary in their polysaccharide compositions and lignin contents, their monosaccharide compositions and lignin contents are often determined, but these analyses are time consuming and laborious. We therefore investigated Fourier transform infrared (FTIR) spectroscopy coupled with partial least squares (PLS) regression analysis as a way of rapidly predicting the monosaccharide compositions and lignin contents of the cell walls of compression wood (CW) and opposite wood (OW) of the gymnosperm Pinus radiata. The effects were investigated of sample moisture content (ambient or dry) and sample particle size (large particles, < 0.422 mm or small particles, < 0.178 mm) of milled wood on attenuated total reflectance (ATR) and transmission FTIR spectra, as well as the PLS-1 models and subsequent predictions. PLS-1 models were built using mixtures of CW and OW as the training set, to provide a linear range of monosaccharide compositions and lignin contents. Models were externally validated by predicting another set of wood mixtures before predicting CW and OW of a separate test set. Most of the monosaccharide amounts in the separate test set were best predicted by ATR spectroscopy of ambient large particles, achieving the lowest standard error values for the monosaccharides arabinose (0.36%), xylose (1.05%), galactose (1.79%), glucose (6.32%), and 4-O-methylglucuronic acid (0.20%). The results show the feasibility of using ATR spectroscopy of ambient large particles for the rapid prediction of monosaccharide compositions and lignin contents of plant cell walls.
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Abbreviations
- ATR FTIR:
-
Attenuated total reflectance Fourier transform infrared
- CW:
-
Compression wood
- NIPALS:
-
Non-linear iterative partial least squares
- OW:
-
Opposite wood
- PLS:
-
Partial least squares
- RMSECV:
-
Root mean squared error of cross validation
- RMSEP:
-
Root mean squared error of prediction
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Acknowledgments
We thank Professor John C. F. Walker (School of Forestry, University of Canterbury) for providing the wood samples, and Professor Christopher M. Triggs and Associate Professor Brian H. McArdle (Department of Statistics, University of Auckland) for statistical advice. This work was supported by the New Zealand Foundation for Research, Science and Technology (now Ministry of Business, Innovation and Employment) [PROJ-12401-PPS-UOC, “Compromised Wood Quality”].
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Fahey, L.M., Nieuwoudt, M.K. & Harris, P.J. Predicting the cell-wall compositions of Pinus radiata (radiata pine) wood using ATR and transmission FTIR spectroscopies. Cellulose 24, 5275–5293 (2017). https://doi.org/10.1007/s10570-017-1506-4
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DOI: https://doi.org/10.1007/s10570-017-1506-4