Abstract
Carbon nanotubes exhibit remarkable thermal and mechanical properties, so they may offer a structural reinforcement in hydrogels, e.g. cartilage, which could be used in regenerative medicine. The aim of the present work is to follow the principles of green chemistry to accomplish a one-step and solvent-free derivatization of oxidized multi-walled carbon nanotubes (MWNT) with riboflavin sodium phosphate (FMN). The viability of the MWNT-riboflavin (MWFMN) nanocomposite as a photosensitizer was tested for collagen crosslinking under sunlight. Results were compared with those obtained for free FMN under the same conditions. In addition, some samples were held in darkness as a control group. MWNT derivatization was demonstrated by ATR-FTIR spectroscopy, thermogravimetric analysis (TGA), and electron microscopy (SEM and TEM). The collagen crosslinking was characterized by DLS, ATR-FTIR, TGA and SEM. The results suggested that the use of the nanocomposite (MWFMN) improves the structural and thermal properties of collagen matrices.
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