title: Polyalkylcyanoacrylates as in situ formed diffusion barriers in multimaterial drug carriers.
abstract: Polymeric hydrogels typically release their drug payload rapidly due to their high water content and the diffusivity for drug molecules. This study proposes a multimaterial system to sustain the release by covering the hydrogel with a poly(alkyl-2-cyanoacrylate) [PACA]-based film, which should be formed by an in situ polymerization on the hydrogel surface initiated upon contact with water. A series of PACA-hydrogel hybrid systems with increasing PACA side chain hydrophobicity was prepared using physically crosslinked alginate films and hydrophilic diclofenac sodium as model hydrogel/drug system. Successful synthesis of PACA at the hydrogel surface was confirmed and the PACA layer was identified to be most homogeneous for poly(n-butyl-2-cyanoacrylate) on both the micro- and nanolevel. At the same time, the diclofenac release from the hybrid systems was substantially sustained from ~1day for unmodified hydrogels up to >14days depending on the type of PACA employed as diffusion barrier. Overall, in situ polymerized PACA films on hydrogels may be widely applicable to various hydrogel matrices, different matrix sizes as well as more complex shaped hydrogel carriers.
authors: Institute of Biomaterial Science, Helmholtz-Zentrum Geesthacht, Teltow, Germany; Berlin-Brandenburg Centre for Regenerative Therapies, Teltow and Berlin, Germany.
authors: Christian
authors: C
authors: Wischke
authors: Cornelius
authors: C
authors: Schneider
authors: Axel T
authors: AT
authors: Neffe
authors: Andreas
authors: A
authors: Lendlein
mesh_terms: D000464:Alginates / Q000737:chemistry*; D003487:Cyanoacrylates / Q000737:chemistry*; D003692:Delayed-Action Preparations / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry; D058105:Polymerization
chemical_list: D000464:Alginates; D003487:Cyanoacrylates; D003692:Delayed-Action Preparations; D006603:Hexuronic Acids; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D020723:Glucuronic Acid