title: Cyclodextrin controlled release of poorly water-soluble drugs from hydrogels.
abstract: The effect of 2-hydroxypropyl-beta-cyclodextrin and gamma-cyclodextrin on the release of ibuprofen, ketoprofen and prednisolone was studied. Stability constants calculated for inclusion complexes show size dependence for complexes with both cyclodextrins. Hydrogels were prepared by ultraviolet irradiation and release of each model drug was studied. For drugs formulated using cyclodextrins an increase in the achievable concentration and in the release from hydrogels was obtained due to increased solubility, although the solubility of all gamma-cyclodextrin complexes was limited. The load also was increased by adjusting pH for the acidic drugs and this exceeds the increase obtained with gamma-cyclodextrin addition.
authors.affiliation: Section of Chemistry, Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Aalborg, Denmark.
authors.forename: Henriette Sie
authors.initials: HS
authors.lastname: Woldum
authors.forename: Kim Lambertsen
authors.initials: KL
authors.lastname: Larsen
authors.forename: Flemming
authors.initials: F
authors.lastname: Madsen
mesh_terms: D000073738:2-Hydroxypropyl-beta-cyclodextrin; D000893:Anti-Inflammatory Agents / Q000737:chemistry*; D002626:Chemistry, Pharmaceutical; D003432:Cross-Linking Reagents / Q000737:chemistry; D003692:Delayed-Action Preparations; D004058:Diffusion; D004337:Drug Carriers; D004339:Drug Compounding; D020100:Hydrogels; D006863:Hydrogen-Ion Concentration; D007052:Ibuprofen / Q000737:chemistry; D007660:Ketoprofen / Q000737:chemistry; D007700:Kinetics; D008689:Methacrylates / Q000737:chemistry; D008956:Models, Chemical; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry; D011205:Povidone / Q000737:chemistry*; D011239:Prednisolone / Q000737:chemistry; D012995:Solubility; D014867:Water / Q000737:chemistry*; D047392:beta-Cyclodextrins / Q000737:chemistry*; D047408:gamma-Cyclodextrins / Q000737:chemistry*
chemical_list: D000893:Anti-Inflammatory Agents; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D020100:Hydrogels; D008689:Methacrylates; D047392:beta-Cyclodextrins; D047408:gamma-Cyclodextrins; C421283:poly(ethylene glycol)-dimethacrylate; D014867:Water; D000073738:2-Hydroxypropyl-beta-cyclodextrin; D011092:Polyethylene Glycols; D007660:Ketoprofen; D011239:Prednisolone; D011205:Povidone; D007052:Ibuprofen