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Journal of Wood Science

, Volume 55, Issue 6, pp 409–416 | Cite as

Nanostructural assembly of cellulose, hemicellulose, and lignin in the middle layer of secondary wall of ginkgo tracheid

  • Noritsugu Terashima
  • Kohei Kitano
  • Miho Kojima
  • Masato Yoshida
  • Hiroyuki Yamamoto
  • Ulla Westermark
Original Article

Abstract

Physical, chemical, and biological properties of wood depend largely on the properties of cellulose, noncellulosic polysaccharides, and lignin, and their assembly mode in the cell wall. Information on the assembly mode in the main part of the ginkgo tracheid wall (middle layer of secondary wall, S2) was drawn from the combined results obtained by physical and chemical analyses of the mechanically isolated S2 and by observation under scanning electron microscopy. A schematic model was tentatively proposed as a basic assembly mode of cell wall polymers in the softwood tracheid as follows: a bundle of cellulose microfibrils (CMFs) consisting of about 430 cellulose chains is surrounded by bead-like tubular hemicellulose-lignin modules (HLM), which keep the CMF bundles equidistant from each other. The length of one tubular module along the CMF bundle is about 16 ± 2 nm, and the thickness at its side is about 3–4 nm. In S2, hemicelluloses are distributed in a longitudinal direction along the CMF bundle and in tangential and radial directions perpendicular to the CMF bundle so that they are aligned in the lamellae of tangential and radial directions with regard to the cell wall. One HLM contains about 7000 C6-C3 units of lignin, and 4000 hexose and 2000 pentose units of hemicellulose.

Key words

Cellulose microfibril Ginkgo biloba Hemicellulose Lignin Nanostructure 

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Copyright information

© The Japan Wood Research Society 2009

Authors and Affiliations

  • Noritsugu Terashima
    • 1
  • Kohei Kitano
    • 2
  • Miho Kojima
    • 2
  • Masato Yoshida
    • 2
  • Hiroyuki Yamamoto
    • 2
  • Ulla Westermark
    • 1
  1. 1.STFI (Swedish Pulp and Paper Research Institute)StockholmSweden
  2. 2.Laboratory of Biomaterial Physics, Graduate School of Bioagricultural SciencesNagoya UniversityNagoyaJapan

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