1 resultado para Expansion tissulaire
em Archimer: Archive de l'Institut francais de recherche pour l'exploitation de la mer
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Resumo:
Tissue engineering is a real challenge for the treatment of cartilage pathologies. In this field, biomimetic hydrogels based on natural polymers are among the most commonly used matrices. A hydrogel made of silanized hydroxypropylmethylcellulose (HPMC-Si) is especially promising because it can be injected in cartilaginous lesions by minimally invasive surgery. However, the current synthesis of HPMC-Si is limited by the insolubility of hydroxypropylmethylcellulose (HPMC). This thesis work was focused on finding new synthesis conditions for the design of HPMC-Si hydrogel. In order to obtain a complete solubilization of HPMC and to improve its functionalization by the (3-glycidyloxypropyl) trimethoxysilane (GPTMS), the use of ionic liquids (IL), which are excellent solvents for polysaccharides, was undertaken. The beginning of this study was first devoted to the selection of an IL and then to the development of new reaction conditions. With these new conditions, higher silicon rates were obtained for HPMC modified in ionic liquid medium, however no hydrogel could be formed. The second part was therefore devoted to the synthesis of GPTMS 13C. Indeed, thanks to this radiolabeling, a structural characterization by 13C NMR of the HPMC-Si could be achieved. Finally, the reactivity in organic solvents of three organosilanes, including the GPTMS, was investigated toward nucleophiles representing the common functions found in natural polymers (e.g. -NH2, -OH, -SH). The results of this thesis have provided insights into the GPTMS reactivity in organic medium and thus paves the way to new conditions for the silanization of polysaccharides.