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Title: Color and surface chemistry changes of extracted wood flour after heating at 120 °C

Source: Wood Sci Technol Volume, 48 2014; pp. 137-150.

Author(s)Chen, Yao; Tshabalala, Mandla A.; Gao, Jianmin; Stark, Nicole M.

Publication Year: 2013  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4706-1B  FPL-4707-2B

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.

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

Publication Review Process: Formally Refereed

File size: 561 kb(s)

Date posted: 02/24/2014

This publication is also viewable on Treesearch:  view
RITS Product ID: 67211
Current FPL Scientists associated with this product (listed alphabetically)
Stark, Nicole M.
Research Chemical Engineer
Tshabalala, Mandla A.
Research Chemist
 

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