Abstract
This study reports on the preparation of lignin-free wood sections maintaining the anatomical structure of Cryptomeria japonica by means of alcoholysis combined with sodium chlorite treatment. To determine the optimal alcoholysis conditions, Fourier transform infrared spectroscopy was combined with multivariate analysis, and the obtained results indicated that the alcoholysis reaction proceeded over three stages. In the first stage, lignin and hemicellulose are partially removed. In the second stage, hemicellulose and amorphous cellulose are degraded and humin is formed. In the third stage, crystalline cellulose is degraded, further promoting the formation of humin. Since it is difficult to completely remove lignin by alcoholysis alone, the wood sections were subsequently subjected to sodium chlorite treatment. As a result, lignin-free sections were produced without degradation of the woody anatomical structure. Furthermore, alcoholysis at 140 °C for 1 h coupled with sodium chlorite treatment for 1 h succeeded in producing sections composed of essentially hemicellulose-free cellulose. These achievements make this protocol potentially applicable as a substrate for artificial cell walls and for the development of novel functional filters.
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Acknowledgments
The authors sincerely appreciate Mr. Adachi of Kyoto University for providing the wood samples. This research study was jointly supported by JSPS a Grant-in-Aid for Scientific Research (Grant number 21J13235) and a Grant-in-Aid for Challenging Exploratory Research (KAKENHI, 22K19203).
Funding
This work was supported in part by the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for JSPS fellows (Grant number 21J13235) and a Grant-in-Aid for Challenging Exploratory Research (KAKENHI, 22K19203).
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SH and YH carried out the chemical treatments and hierarchical structural assessments. TK carried out the X-ray diffraction analysis. SN and RF carried out the anatomical structural analysis. All authors read and approved the final manuscript.
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Hirano, S., Kurei, T., Nakaba, S. et al. Elucidation of alcoholysis for the preparation of lignin-free wood sections from Cryptomeria japonica. Cellulose 30, 6589–6600 (2023). https://doi.org/10.1007/s10570-023-05291-9
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DOI: https://doi.org/10.1007/s10570-023-05291-9