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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Spectrochemical characterization by FT-Raman spectroscopy of wood heat-treated at low temperatures: Japanese larch and beech

Journal of Wood Science volume 51, pages 498–506 (2005)Cite this article

Abstract

Test samples of Japanese larch (Larix leptolepis) heartwood and Japanese beech (Fagus crenata) sapwood were heated for 22 h at constant temperatures (50°–180°C) under three water content conditions. Raman spectra of the samples were recorded before and after the heat treatments, and spectral changes in the range from 1000 cm−1 to 1800 cm−1 were evaluated using the difference spectrum method. For both wood species, the Raman band intensity at 1655–1660 cm−1 due mainly to the C=C and C=O groups in lignin clearly decreased with increasing heat-treatment temperature (HTT). The spectral change was thought to reflect the progress of condensation reactions of lignin molecules during the heat treatment. Moreover, the decrease in band intensity was considerably facilitated by the presence of water in the cell wall, suggesting that the condensation is closely related to the softening of lignin. From the spectral changes in the wavenumber region of 1200–1500 cm−1, it was considered that wood constituents are partially decomposed at the higher HTT.

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Authors and Affiliations

  1. Institute of Wood Technology, Akita Prefectural University, 11-1 Kaieisaka, Noshiro, 016-0876, Japan

    Shigeru Yamauchi & Yasuo Iijima

  2. Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, 305-8572, Japan

    Shuichi Doi

Authors
  1. Shigeru Yamauchi
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  2. Yasuo Iijima
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  3. Shuichi Doi
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Correspondence to Shigeru Yamauchi.

Additional information

Part of this article was presented at the 53rd Annual Meeting of the Japan Wood Research Society, Fukuoka, March 2003

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Yamauchi, S., Iijima, Y. & Doi, S. Spectrochemical characterization by FT-Raman spectroscopy of wood heat-treated at low temperatures: Japanese larch and beech. J Wood Sci 51, 498–506 (2005). https://doi.org/10.1007/s10086-004-0691-6

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  • DOI: https://doi.org/10.1007/s10086-004-0691-6

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