Journal
CELLULOSE
Volume 21, Issue 4, Pages 2219-2231Publisher
SPRINGER
DOI: 10.1007/s10570-014-0322-3
Keywords
Reaction wood; Tension wood; Compression wood; Cellulose microfibril assembly; Sum; frequency; generation spectroscopy; X-ray; diffraction
Funding
- Center for Lignocellulose Structure and Formation, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences [DE-SC0001090]
- Forest Biotechnology Industrial Research Consortium (FORBIRC) at North Carolina State University
- National Science Foundation, Plant Genome Research Program [DBI-092239]
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The cellulose microfibril assemblies in secondary cell walls of tension wood and compression wood were studied with vibrational sum frequency generation (SFG) spectroscopy. The tension wood contains the gelatinous layer with highly-crystalline and highly-aligned cellulose microfibrils. The SFG spectral features of tension wood changed depending on the azimuth angle between the polarization of the incident IR beam and the preferential alignment axis of the cellulose microfibrils. The SFG spectra of the compression wood did not show any dependence on the azimuth angle, implying that the overall orientation of cellulose microfibrils in compression wood is not highly aligned. Instead, the decrease of cellulose content in compression wood brought about larger separation between cellulose microfibrils, which was manifested as changes in CH2/OH intensity ratio in SFG spectra. These results implied that SFG spectral features are sensitive to cellulose microfibril alignments and inter-fibrillar separations.
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