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  1. Color and surface chemistry changes of extracted wood flour after heating at 120 °C

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    Author(s): Yao Chen; Mandla A. Tshabalala; Jianmin Gao; Nicole M. Stark
    Date: 2013
    Source: Wood Sci Technol Volume, 48 2014; pp. 137-150.
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    DOI: https://doi.org/10.1007/s00226-013-0582-3
    PDF: View PDF  (560.74 KB)

    Description

    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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    Citation

    Chen, Yao; Tshabalala, Mandla A.; Gao, Jianmin; Stark, Nicole M.; Fan Yongming. 2013. Color and surface chemistry changes of extracted wood flour after heating at 120 °C. Wood Sci Technol Volume, 48 2014; pp. 137-150.

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    Keywords

    wood flour, heat treatment, delignification, color, surface chemistry

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