Conformational Behavior of Chitosan in the Acetate Salt : An X-Ray Study

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概要

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• A well-defined X-ray fiber pattern of chitosan acetate was obtained by immersing a tendon chitosan, prepared from a crab tendon chitin by a solid-state N-deacetylation, in an aqueous acetic acid-isopropanol solution at 110℃. This pattern was very similar to that of chitosan salts with some inorganic acids, such as HF, HCl, and H_2SO_4, in which chitosan chains form an 8/5 helix, indicating that chitosan acetate also take up this conformation. This information may give an influential clue to the chitosan conformation in the aqueous acetic acid solution, the most popular solvent for chitosan. However, after one month of storage of the chitosan acetate, the fiber pattern, the density and its IR spectrum changed to those of the anhydrous polymorph of chitosan, suggesting that the acetic acid was removed accompanied with water molecules from the crystal during storage and that the polymorph can be obtained not only by annealing chitosan, but also through the chitosan acetate.

• 社団法人日本農芸化学会の論文
• 1997-07-23

著者

• YAMAMOTO Atsushi

  Research Institute for Energy Electronics, AIST

• Ogawa K

  Department Of Citrus Research National Institute Of Fruit Tree Science

• Ogawa Kazunori

  Department Of Citrus Research National Institute Of Fruit Tree Science

• Okamura K

  Mercian Corporation Central Research Laboratories

• Yui Toshifumi

  Faculty Of Engineering Miyazaki University

• KAWADA Junpei

  Research Institute for Advanced Science and Technology, Osaka Prefecture University

• Kawada J

  Osaka Prefecture Univ. Osaka Jpn

• Ogawa Kozo

  Research Institute For Advanced Science And Technology (riast)

• Yamamoto Atsushi

  Research Institute For Advanced Science And Technology (riast) Osaka Prefeature University

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