title: Solid-state 13C NMR and X-ray diffraction of dermatan sulfate.
abstract: Dermatan sulfate in the solid state has been studied by 13C CP/MAS nmr and X-ray diffraction in order to establish the ring conformation of the L-iduronate moiety. The solid state nmr spectrum is similar to the solution spectrum obtained previously, indicating that a ring conformation at least approximating to 1C4 predominates in the solid state. X-ray powder diffraction data from the same sample indicate the presence of the 8-fold helix form previously observed by fiber diffraction, and interpreted in terms of a 4C1 ring form. A likely explanation of the results is that a distorted 1C4 L-iduronate ring conformation, not considered in the initial X-ray analysis, may emerge to provide a satisfactory interpretation of all available physical-chemical data.
mesh_terms: D000818:Animals; D002807:Chondroitin / Q000031:analogs & derivatives; D003871:Dermatan Sulfate; D007067:Iduronic Acid; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D013552:Swine; D014961:X-Ray Diffraction
chemical_list: D003871:Dermatan Sulfate; D007067:Iduronic Acid; D002807:Chondroitin