title: Controlled release of dexamethasone acetate from biodegradable and biocompatible polyurethane and polyurethane nanocomposite.
abstract: Polyurethanes and polyurethane nanocomposites can be applied to control the release of drugs previously incorporated into these materials. In this study, dexamethasone acetate (ACT) was incorporated into biodegradable and biocompatible polyurethane and polyurethane containing montmorillonite nanoparticles. Fourier transform infrared spectroscopic technique showed no strong interactions between drug and polymers. Data obtained from X-ray diffraction and small angle X-ray scattering indicated that the incorporation of ACT did not disturb the polymer morphology, but montmorillonite led to a less defined phase separation between hard and soft segments of polyurethane. The in vitro release studies demonstrated that nanoparticles increased the rate of ACT release possibly because these particles have a hydrophilic surface that increases the absorption of water and accelerates the hydrolysis of the polymer. The in vivo short-term biocompatibility studies demonstrated adequate interfacial interaction between polyurethane and subcutaneous tissue and a discreet inflammatory response which was completely resolved in 14 days.
authors: School of Pharmacy, Federal University of Minas Gerais, Belo Horizonte, Brazil.
authors: Gisele Rodrigues
authors: GR
authors: Da Silva
authors: Eliane
authors: E
authors: Ayres
authors: Rodrigo Lambert
authors: RL
authors: Orefice
authors: Sandra Aparecida L
authors: SA
authors: Moura
authors: Denise Carmona
authors: DC
authors: Cara
authors: Armando Da Silva
authors: Ada S
authors: Cunha
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry*; D000077215:Clay; D003692:Delayed-Action Preparations / Q000737:chemistry; D003907:Dexamethasone / Q000031:analogs & derivatives* / Q000737:chemistry; D005260:Female; D008422:Materials Testing; D051379:Mice; D053761:Nanocomposites / Q000737:chemistry*; D009504:Neutrophils / Q000502:physiology; D009195:Peroxidase / Q000378:metabolism; D011140:Polyurethanes / Q000737:chemistry*; D012542:Scattering, Radiation; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D000538:Aluminum Silicates; D001672:Biocompatible Materials; D003692:Delayed-Action Preparations; D011140:Polyurethanes; D003907:Dexamethasone; C018038:dexamethasone acetate; D009195:Peroxidase; D000077215:Clay