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2003 Fiscal Year Final Research Report Summary

Studies on behavior for dissolution of native cellulose used bacterial cellulose in aqueous NaOH solutions

Research Project

Project/Area Number 13660337
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 生物資源科学
Research InstitutionFukui National College of Technology

Principal Investigator

YAMAMOTO Hiroyuki  Fukui National College of Technology, General Education, Associate Professor, 一般科目教室, 助教授 (00158304)

Co-Investigator(Kenkyū-buntansha) HORII Fumitaka  Kyoto University, Institute for Chemical Research, Professor, 化学研究所, 教授 (70124758)
Project Period (FY) 2001 – 2003
KeywordsNative cellulose / Bacterial cellulose / Microfibril structure / Dissolution / Solid-phase nitration / Aqueous NaOH solution / Acid hydrolysis / Heat tretment at high temperature
Research Abstract

In this study, we examined the possibility of dissolution of native cellulose used bacterial cellulose in aqueous NaOH solutions, and to obtain information about the morphology-relating dissolution: Bacterial cellulose was chosen because its cellulose is a superfine fiber and the biosynthetic process to fibril is relatively well known. The dissolution of bacterial cellulose in aqueous NaOH solutions has been investigated by the following three methods. First, the heat-treatment of bacterial cellulose was examined at high temperature above 180°C in aqueous NaOH solutions. As a result, the dissolution of bacterial cellulose was not observed. Because it is thought that decomposition by hydrolysis proceed more rapidly than dissolution. However, it became apparent that the decomposition of the cellulose at high temperature is not controlled by aqueous NaOH solution but by aqueous Na_2SiO_3 solution. Secondly, it is not yet known how intra-and inter-molecular hydrogen bonding and the disorde … More red component are produced during the crystallization, but these structure entities are very important in relation to solubility of native cellulose. In order to obtain new information about these structures, solid-phase nitration of bacterial cellulose has been investigated in detail. It is found that the disordered component is distributed in the whole areas of the fiber, and the diffusion of the reaction medium with high acid concentration breaks intra-and inter-molecular hydrogen bonding. In order to break only this hydrogen bonding, bacterial cellulose was treated at -80°C in the reaction medium with high acid. Such treated cellulose dissolved in aqueous NaOH solution. Thirdly, the treatment of hydrolysis of bacterial cellulose was carried out by sulfuric acid to discuss the relationship between solubility and polymerization degree of cellulose. This bacterial cellulose with low polymerization degree rapidly dissolved in 8% NaOH solution at low temperature. The detailed analysis for the relationship between solubility and polymerization degree of cellulose is in progress at present. Less

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 山本裕之, 堀井文敬, 平井諒子: "バクテリアセルロースの固相反応とミクロフィブリル構造"セルロース学会第9回年次大会講演要旨集. 13-14 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroyuki Yamamoto, Fumitaka Horii, Asako Hirai: "Microfibril Structure for Bacterial Cellulose as Revealed though Solid-Phase Nitration and Acetylation"Preprints of 1^<st> International Cellulose Conference. 111 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroyuki Yamamoto, Fumitaka Horii, Asako Hirai: "Microfibril Structure of Bacterial Cellulose as Studied though Solid-Phase Nitration and Acetylation"Preprints of the 225^<th> American Chemical Society National Meeting. 69(CELL) (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kenji Masuda, Masauki Adachi, Asako Hirai, Hiroyuki Yamamoto, Hironori Kaji, Fumitaka Horii: "Solid-state ^<13>C and ^1H spin diffusion NMR analyses of the microfibril structure for bacterial cellulose"Solid State Nucl.Magn.Reson.. 23. 198-212 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kenji Masuda, Masauki Adachi, Asako Hirai, Hiroyuki Yamamoto, Hironori Kaji, Fumitaka Horii: "Solid-state^<13>C and ^1H spin diffusion NMR analyses of the microfibril structure for bacterial cellulose"Solid State Nucl. Magn.. Reson, 23. 198-212 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroyuki Yamamoto, Fumitaka Horii, Asako Hirai: "Microfibril Structure of Bacterial Cellulose as Studied though Solid-Phase Nitration and Acetylation"Preprints of the 225^<th> American Chemical Society National Meeting in New Orleans. (CELL). 69 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroyukii Yamamoto, Fumitaka Horii, Asako Hirai: "Microfibril Structure for Bacterial Cellulose as Revealed though solid-Phase Nitration and Acetylation"Preprints of 1^<st> International Cellulose Conference. 111 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroyuki Yamamoto, Fumitaka Horii, Asako Hirai: "Solid-phase Reaction and Microfibril structure of Bacterial Cellulose"Preprints of 2002 Cellulose R&D 9^<th> Annual Meeting of the Cellulose Society of Japan. 13-14 (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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