Chemical Studies on Wood Hemicelluloses. II. On the Hemicellulose of Ganpi Bast Fibres. I

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  • Seishi Machida
    Chemical Laboratory of Textile Fibres Kyoto University of Industrial Arts and Textile Fibres
  • Sadanori Nishikori
    Chemical Laboratory of Textile Fibres Kyoto University of Industrial Arts and Textile Fibres

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<jats:title>Abstract</jats:title> <jats:p>The composition of the bast fibres of Ganpi plant (Wickstroemia sikokiana Franch. et Sav.) was investigated in the processes of the traditional paper-making of Japan. It was found that hemicelluloses of the bast fibres had significant bearings on the paper-making and the excellent character of Japanese paper.</jats:p> <jats:p>The hemicellulose isolated from holocellulose of the Ganpi bast fibres by alkaline extraction were found to be composed of 13.6∼15.8% of d-glucuronic acid (which is partly present as 4-O-methyl-d-glucuronic acid), 58.1∼80.9% of d-xylose, and small amounts of d-mannose, d-galactose, l-arabinose, and l-rhamnose. It was shown that the degree of polymerisation of the hemicellulose calculated as a pentosan is about 160, and the molecule has basically a linear structure in which the uronic groups are present along the polymer chain at a ratio of one carboxyl group for each six or eight pentose sugar units.</jats:p>

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