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The three-dimensional structure of chitosan/HI type I salt was determined by the X-ray fiber diffraction technique and linked-atom least-squares refinement method. Two polymer chains and four iodide ions (I - ) crystallized in a monoclinic unit cell with dimensions a=9.46(2), b=9.79(2), c (fiber axis)=10.33(2)A, β=105.1(2) o and a space group P2 1 . Chitosan chains adopted...
Chitosan/HI type II salt prepared from crab tendon was investigated by X-ray fiber diffraction. Two polymer chains and 16 iodide ions (I - ) crystallized in a tetragonal unit cell with lattice parameters of a=b=10.68(3), c(fiberaxis)=40.77(13)A, and a space group P4 1 . Chitosan forms a fourfold helix with a 40.77A fiber period having a disaccharide as the helical asymmetric unit....
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