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<p>Wood cell walls consist of a nano-scale ultrastructure, in which cellulose microfibrils are embedded within a hemicellulose-lignin matrix. Although this ultrastructure likely differs between softwoods and hardwoods, detailed comparative information remains limited. In our previous study, we investigated the thermal reactivity of cellulose and hemicellulose in the cell walls of Japanese cedar and Japanese beech, to explore their ultrastructural organization, based on the hypothesis that thermal reactivity reflects the location and mobility of wood cell wall components. In this study, we expand the analysis of five softwood and five hardwood species to identify general characteristics distinguishing the two groups. Thermogravimetry (TG) and hydrolyzable sugar analysis of pyrolyzed residues were conducted under consisting heating conditions. The results showed that primary cell walls degraded at lower temperatures than secondary cell walls. Xylan and glucomannan exhibited similar reactivities within specific wood species but were slightly more reactive in hardwoods than softwoods, explaining distinct DTG peaks (or shoulders) observed at lower temperatures exclusively for hardwoods. Additionally, metal cations bound to carboxyl groups associated with xylan significantly enhanced the cellulose and glucomannan reactivity in certain wood species. These findings provide new insights into cell wall ultrastructure in terms of component distribution, mobility, and thermal behavior.</p>

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Thermal reactivities of hemicellulose and cellulose and demineralization effects on their reactivities in cell walls of various softwood and hardwood species

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月10日

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  • Yu Wang,
  • Ramadan Eljamal,
  • Takashi Nomura,
  • Eiji Minami,
  • Haruo Kawamoto

摘要

Wood cell walls consist of a nano-scale ultrastructure, in which cellulose microfibrils are embedded within a hemicellulose-lignin matrix. Although this ultrastructure likely differs between softwoods and hardwoods, detailed comparative information remains limited. In our previous study, we investigated the thermal reactivity of cellulose and hemicellulose in the cell walls of Japanese cedar and Japanese beech, to explore their ultrastructural organization, based on the hypothesis that thermal reactivity reflects the location and mobility of wood cell wall components. In this study, we expand the analysis of five softwood and five hardwood species to identify general characteristics distinguishing the two groups. Thermogravimetry (TG) and hydrolyzable sugar analysis of pyrolyzed residues were conducted under consisting heating conditions. The results showed that primary cell walls degraded at lower temperatures than secondary cell walls. Xylan and glucomannan exhibited similar reactivities within specific wood species but were slightly more reactive in hardwoods than softwoods, explaining distinct DTG peaks (or shoulders) observed at lower temperatures exclusively for hardwoods. Additionally, metal cations bound to carboxyl groups associated with xylan significantly enhanced the cellulose and glucomannan reactivity in certain wood species. These findings provide new insights into cell wall ultrastructure in terms of component distribution, mobility, and thermal behavior.