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Studies on chitan (β-(1 → 4)-linked 2-acetamido-2-deoxy-D-glucan) fibers of the diatom Thalassiosira fluviatilis, Hustedt. III. The structure of chitan from x-ray diffraction and electron microscope observations

Canadian journal of chemistry, 1968-05, Vol.46 (9), p.1513-1521 [Peer Reviewed Journal]

ISSN: 0008-4042 ;EISSN: 1480-3291 ;DOI: 10.1139/v68-248

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  • Title:
    Studies on chitan (β-(1 → 4)-linked 2-acetamido-2-deoxy-D-glucan) fibers of the diatom Thalassiosira fluviatilis, Hustedt. III. The structure of chitan from x-ray diffraction and electron microscope observations
  • Author: Dweltz, N. E ; Colvin, J. Ross ; McInnes, A. G
  • Is Part Of: Canadian journal of chemistry, 1968-05, Vol.46 (9), p.1513-1521
  • Description: The form and crystal structure of the fibers attached to the diatom Thalassiosira fluviatilis were studied by the electron microscope and x-ray diffraction.These fibers, which were shown previously to be pure, highly crystalline β-(1 → 4) linked poly-N-acetyl- D -glucosamine (chitan), are strap-like in cross section, 1000-2000 Å in width at their widest point close to the base, from which they taper uniformly to a very small tip at their outer extremity. Three connected filaments or microfibrils form the fiber at its widest point.The unit cell of chitan is monoclinic with the space group P2 1 . The parameters of the unit cell are a = 4.80, b = 10.32, c = 9.83 Å, and β = 112°. The density of the chitan fibers is 1.495 g/cm 3 . There is only one polymeric chain per unit cell with a two-fold screw axis and therefore the chains are parallel to each other. A three-dimensional structure is proposed for chitan which is reasonable from stereochemical considerations and which is in good agreement with all observed x-ray diffraction data.
  • Publisher: Ottawa, Canada: NRC Research Press
  • Language: English
  • Identifier: ISSN: 0008-4042
    EISSN: 1480-3291
    DOI: 10.1139/v68-248
  • Source: Alma/SFX Local Collection
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