Abstract
To investigate the effect of heat on color and surface chemistry of wood flour (WF), unextracted, extracted and delignified samples of commercial WF were heated at 120 °C for 24 h and analyzed by colorimetry, diffuse reflectance visible (DRV), attenuated total reflectance Fourier transform infrared (ATR-FTIR) and Fourier transform Raman (FT-Raman) spectroscopies. Unextracted samples showed a slight increase in CIEL*a*b* color coordinates, a * and b *. Compared with unextracted samples, color changes of the extracted samples varied with composition of the extraction solvents with generally smaller increases in a * and larger decreases in b * values. Delignified samples were marked by even larger increases in both a * and b * values. The color changes could be explained by analysis of the respective DRV, FTIR and FT-Raman spectra of the samples before and after heating. Heating of the extracted WF at 120 °C resulted in a red shift of the absorption at 430 nm and increase in absorption in the violet-blue spectral region of visible light. Delignified samples showed even more pronounced absorption in this spectral region after heating.
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Acknowledgments
Authors express their sincere thanks to Sally A. Ralph at USDA Forest Products Laboratory for her help with Raman spectroscopy. Financial support from National Natural Science Foundation of China (series number of the project: 31070490) is gratefully acknowledged. This research was funded in part by China Scholarship Council (CSC).
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Chen, Y., Tshabalala, M.A., Gao, J. et al. Color and surface chemistry changes of extracted wood flour after heating at 120 °C. Wood Sci Technol 48, 137–150 (2014). https://doi.org/10.1007/s00226-013-0582-3
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DOI: https://doi.org/10.1007/s00226-013-0582-3