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Mercerization and acid hydrolysis of bacterial cellulose

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Abstract

Structural changes in never- dried, disintegrated bacteria l cellulose by treatment with aqueous NaOH were examined by electron microscopy, X-ray diffractometry and acid hydrolysis behaviour and compared with those of cotton cellulose. The microfibril kept its fibrillar morphology after treatment with NaOH solutions of less than 9% (w/w), but changed into irregular aggregates when treated with NaOH above 12% (w/w), corresponding to the crystal conversion to cellulose II. The crystallinity of the resulting cellulose II was very low after a brief alkali treatment, but was increased significantly by elongated treatment (up to 10 days). In contrast, cotton cellulose was converted to cellulose II of fairly high crystallinity by alkali treatment of as little as 3 min duration, and the crystallinity did not change with longer treatments. The leveling-off degree of polymerization (LODP) of bacterial cellulose was decreased from 150 to 50 by 18% (w/w) NaOH treatment, while that of cotton linter decreased from 260 to 70. These characteristic differences between cotton linter cellulose and bacterial cellulose can be ascribed to a basic difference in microfibrillar organization in these materials: the microfibrils in cotton cellulose are in close contact with neighbouring microfibrils having opposite polarity, and in bacterial cellulose are isolated from each other and require chain folding to form the antiparallel cellulose II crystal

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Authors and Affiliations

  1. Faculty of Agriculture, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, 113, Japan

    HIDEKI Shibazaki, SHIGENORI Kuga & TAKESHI Okano

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  1. HIDEKI Shibazaki
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  2. SHIGENORI Kuga
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  3. TAKESHI Okano
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Shibazaki, H., Kuga, S. & Okano, T. Mercerization and acid hydrolysis of bacterial cellulose. Cellulose 4, 75–87 (1997). https://doi.org/10.1023/A:1024273218783

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