Abstract
Structural properties of several cross-linked hyaluronan derivatives, obtained by electron microscopy, monodimensional NMR microscopy and low angle X-ray scattering by synchrotron radiation, are presented and compared with those observed for non-modified hyaluronic acid used as reference material. The experimental results, obtained in different media by the different techniques, showed a consistent picture of the synthesized matrices. In particular, the presence of zones of more dense polymeric material observed by electron microscopy resulted in a higher transversal relaxation rate of the bulk water protons as well as in a decrease of the diffusion coefficient obtained by NMR microscopy. Moreover the presence of polymer junction zones gave rise to the appearance of an additional correlation peak in the pattern of the intensity of the scattered X-radiation.
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