Determination of the weight percentage gain and of the acetyl group content of acetylated wood by means of different infrared spectroscopic methods

Analytical Chemistry
Barbara StefkeBarbara Hinterstoisser

Abstract

The weight percentage gain (WPG) and the acetyl group content of wood due to acetylation with acetic anhydride have been analyzed by means of Fourier transform infrared spectroscopy (FTIR) and near-infrared spectroscopy (NIR). Band height ratios (BHR) (1240/1030 (1230/1030) and 1745/1030 (1740/1030)) of the bands at 1745 (1740), 1240 (1230), and 1030 cm-1 were calculated from FTIR-KBr and FTIR-ATR (attenuated total reflection) spectra. The good linear correlation with a coefficient of determination of about 0.94 over a range from 0 to 27% WPG existing between BHRs and WPG and acetyl group content, respectively, requires only a few samples to calibrate FTIR. Partial least-squares regression models based on second derivatives of the NIR spectra in the wavenumber range from 6080 to 5760 cm-1 resulted in a R2 value of 0.99, number of PLS components (rank) between 3 and 5, root-mean-square error of cross-validation between 0.6 and 0.79%, and a residual prediction deviation up to 10. Although a wide range of input parameters (i.e., various wood species and different procedures of acetylation) was used, highly satisfactory results were obtained. Both FTIR and NIR spectroscopic means fulfill the need for determining the WPG and the ace...Continue Reading

Citations

Oct 9, 2015·Journal of the Air & Waste Management Association·Guofeng ShangXiamei Huang
Sep 27, 2014·Carbohydrate Polymers·Hasan SadeghifarDimitris S Argyropoulos
Jul 22, 2017·European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences·Chun-Nan YehChung-Shan Yu
Sep 17, 2020·Physical Chemistry Chemical Physics : PCCP·Andreas NordenströmAlexandr Talyzin
Jan 13, 2021·Scientific Reports·Lynne H ThomasMichael C Jarvis
Jul 19, 2008·Biomacromolecules·Notburga GierlingerManfred Schwanninger

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