title: Diclofenac sodium incorporated PLGA (50:50) microspheres: formulation considerations and in vitro/in vivo evaluation.
abstract: Recently, considerable interest has been focused on the use of biodegradable polymers for specialized applications such as controlled release of drug formulations; meanwhile, microsphere drug-delivery systems using various kinds of biodegradable polymers have been studied extensively during the past two decades. Poly (lactide-co-glycolide) (PLGA) polymers have been proven to be excellent drug carriers for microparticulate systems due to their advantages, e.g. biocompatibility and regulatory approval. The administration of nonsteroidal anti-inflammatory drugs (NSAIDs) into the intra-articular cavity in patients with chronic inflammatory disease is complicated due to the short duration of effect. In the present study, controlled-release parenteral formulations of diclofenac sodium (DS), a commonly used NSAID, were prepared for intra-articular administration, and evaluated in vitro for particle size, yield, drug loading, surface morphology and release characteristics. For in vivo studies, Technetium-99m labelled polyclonal human immunogammaglobulin (99m Tc-HIG) was used as the radiopharmaceutical to demonstrate arthritic lesions by gamma scintigraphy. Evaluation of arthritic lesions post-therapy in rabbits showed no significant difference in the group treated with PLGA (50:50) (mw 34000) DS microspheres compared to control groups.
authors.affiliation: Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, 06100, Sihhiye/Ankara, Turkey.
authors.forename: M
authors.initials: M
authors.lastname: Tunçay
authors.forename: S
authors.initials: S
authors.lastname: Caliş
authors.forename: H S
authors.initials: HS
authors.lastname: Kaş
authors.forename: M T
authors.initials: MT
authors.lastname: Ercan
authors.forename: I
authors.initials: I
authors.lastname: Peksoy
authors.forename: A A
authors.initials: AA
authors.lastname: Hincal
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage* / Q000627:therapeutic use; D001168:Arthritis / Q000188:drug therapy*; D001672:Biocompatible Materials; D001673:Biodegradation, Environmental; D002626:Chemistry, Pharmaceutical; D003692:Delayed-Action Preparations; D004008:Diclofenac / Q000008:administration & dosage* / Q000627:therapeutic use; D004337:Drug Carriers / Q000737:chemistry; D005260:Female; D006801:Humans; D019344:Lactic Acid; D008863:Microspheres; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers; D011817:Rabbits
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D001672:Biocompatible Materials; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D011108:Polymers; D004008:Diclofenac; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid