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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Allomorphs of native crystalline cellulose I evaluated by two equatoriald-spacings

Journal of Wood Science volume 47, pages 124–128 (2001)Cite this article

Abstract

The aim of this study was to develop a facile method for categorizing native celluloses as the algal-bacterial type or the cotton-ramie type and for estimating the Iα/Iβ (triclinic/monoclinic) ratio of the cellulose samples. We investigated various native celluloses by X-ray diffractometry; and discriminant analysis was carried out using two equatoriald-spacings: 0.59–0.62 nm (d 1) and 0.52–0.55 nm (d 2). All of the samples were classified into the two groups without error. The function used to discriminate between the two groups is represented as:Z=1693d1 — 902d 2 — 549, whereZ>0 indicates the algal-bacterial (Iα-rich) type andZ<0 indicates the cotton-ramie (Iβ-dominant) type. Another X-ray diffraction study of hydrothermally treatedCladophora cellulose revealed the relation between thed-spacings (d 1,d 2) and the Iα/Iβ ratio. A calibrating equation by which the Iα/Iβ ratio was estimated from the two parameters,d 1 andd 2, was then prepared. In the case of relatively highly crystalline native celluloses, it was found that the Iα/Iβ ratio is easily determined by applying the two parameters in the equation.

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Authors and Affiliations

  1. Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, 113-8657, Tokyo, Japan

    Masahisa Wada & Takeshi Okano

  2. Wood Research Institute, Kyoto University, Uji, 611-0011, Kyoto, Japan

    Junji Sugiyama

Authors
  1. Masahisa Wada
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  2. Takeshi Okano
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  3. Junji Sugiyama
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Correspondence to Masahisa Wada.

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Wada, M., Okano, T. & Sugiyama, J. Allomorphs of native crystalline cellulose I evaluated by two equatoriald-spacings. J Wood Sci 47, 124–128 (2001). https://doi.org/10.1007/BF00780560

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