title: Cross-linked hyaluronic acid hydrogel films: new biomaterials for drug delivery.
abstract: A new hyaluronic acid (HA)-based hydrogel film was prepared and evaluated for use in drug delivery. This biocompatible material crosslinks and gels in minutes, and the dried film swells and rehydrates to a flexible hydrogel in seconds. HA was first converted to the adipic dihydrazide derivative and then crosslinked with the macromolecular homobifunctional reagent poly(ethylene glycol)-propiondialdehyde to give a polymer network. After gelation, a solvent casting method was used to obtain a HA hydrogel film. The dried film swelled sevenfold in volume in buffer, reaching equilibrium in less than 100 s. Scanning electron microscopy (SEM) of the hydrogel films showed a condensed and featureless structure before swelling, but a porous microstructure when hydrated. The thermal behavior of the hydrogel films was characterized by differential scanning calorimetry. The enzymatic degradation of the HA hydrogel films by hyaluronidase was studied using both SEM and a spectrophotometric assay. Drug release from the hydrogel film was evaluated in vitro using selected anti-bacterial and anti-inflammatory drugs. This novel biomaterial can be employed for controlled release of therapeutic agents at wound sites.
authors.affiliation: Department of Medicinal Chemistry, The University of Utah, 30 South 2000 East, Room 201, Salt Lake City, UT 84112-5820, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Luo
authors.forename: K R
authors.initials: KR
authors.lastname: Kirker
authors.forename: G D
authors.initials: GD
authors.lastname: Prestwich
mesh_terms: D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000737:chemistry; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry*; D002151:Calorimetry; D002240:Carbohydrate Sequence; D003432:Cross-Linking Reagents; D016503:Drug Delivery Systems; D006820:Hyaluronic Acid / Q000737:chemistry*; D006821:Hyaluronoglucosaminidase / Q000737:chemistry; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D008970:Molecular Weight; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000890:Anti-Infective Agents; D000894:Anti-Inflammatory Agents, Non-Steroidal; D001672:Biocompatible Materials; D003432:Cross-Linking Reagents; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D006820:Hyaluronic Acid; D006821:Hyaluronoglucosaminidase