Elaboration of a thermosensitive smart biomaterial: From synthesis to the ex vivo bioadhesion evaluation

Guillaume Conzatti (1) , Sandrine Cavalie (1) , Florence Gayet (2) , J. Torrisani (3) , N. Carrère (3, 4) , Audrey Tourette (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 LCC - Laboratoire de chimie de coordination
3 CRCT - Centre de Recherches en Cancérologie de Toulouse
4 CHU Toulouse - Centre Hospitalier Universitaire de Toulouse

Alginate and chitosan are polysaccharides that are widely used in the biomedical field, especially as wound dressings. Controlled bioadhesion is an advanced functionality that offers the potential to reduce injuries due to the stripping-off of the biomaterial. Herein, we report the efficient grafting of poly-N(isopropylacryamide) (PNIPAM), a thermosensitive polymer that exhibits a lower critical solution temperature (LCST) at 32 °C on the alginate/chitosan polyelectrolyte complex (PEC) surface. In vitro studies did not exhibit a cytotoxic effect, and cells adhered preferentially on the LCST on PNIPAM grafted surfaces, as reported in the literature. Ex vivo investigations revealed that the adhesive behavior of the biomaterials was not the same on the liver and pancreas. The effect of the temperature on the bioadhesion to organs was unexpected, as PNIPAM surfaces exhibited higher adhesion at low temperature. The PNIPAM was therefore able to confer PEC matrix thermosensitivity, but due to the application force, interactions between PNIPAM chains and their substrate could influence bioadhesion on tissues.

Mots clés: Polysaccharides; PEC; PNIPAM; Smart polymer; Controlled bioadhesion

Domaines: Chimie de coordination

Guillaume Conzatti, Sandrine Cavalie, Florence Gayet, J. Torrisani, N. Carrère, et al.. Elaboration of a thermosensitive smart biomaterial: From synthesis to the ex vivo bioadhesion evaluation. Colloids and Surfaces B: Biointerfaces, 2019, 175, pp.91-97. ⟨10.1016/j.colsurfb.2018.11.084⟩. ⟨hal-02132852⟩