title: Protein microspheres as suitable devices for piroxicam release.
abstract: Bovine serum albumin-piroxicam (BSA-piroxicam) and human serum albumin-piroxicam (HSA-piroxicam) microspheres were sonochemically prepared and characterized. The use of polyvinyl alcohol (PVA) lead to an improvement of formulation characteristics, including smaller size, lower polydispersity index (PDl), higher entrapment efficiency and higher stability. The release kinetics of these proteinaceous microspheres was determined in presence of protease, indicating an anomalous drug transport mechanism (diffusion and polymer degradation). In presence of higher protease concentration, BSA microspheres exhibit Case II transport, leading to zero order release (protein degradation). These proteinaceous devices did not show cytotoxicity against human skin fibroblasts in vitro, for range concentrations below to 300 mg L(-1), greatly supporting their potential application in the treatment of inflammatory diseases.
authors.affiliation: University of Minho, Department of Textile Engineering, Campus de Azurém, Guimarães, Portugal.
authors.forename: Raquel
authors.initials: R
authors.lastname: Silva
authors.forename: Helena
authors.initials: H
authors.lastname: Ferreira
authors.forename: Ana C
authors.initials: AC
authors.lastname: Carvalho
authors.forename: Andreia C
authors.initials: AC
authors.lastname: Gomes
authors.forename: Artur
authors.initials: A
authors.lastname: Cavaco-Paulo
mesh_terms: D000818:Animals; D002417:Cattle; D016923:Cell Death / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D002626:Chemistry, Pharmaceutical; D004058:Diffusion / Q000187:drug effects; D016503:Drug Delivery Systems / Q000379:methods*; D006801:Humans; D007700:Kinetics; D051379:Mice; D008863:Microspheres; D010894:Piroxicam / Q000494:pharmacology*; D011142:Polyvinyl Alcohol / Q000737:chemistry; D012709:Serum Albumin / Q000378:metabolism*; D012710:Serum Albumin, Bovine / Q000378:metabolism
chemical_list: D012709:Serum Albumin; D010894:Piroxicam; D012710:Serum Albumin, Bovine; D011142:Polyvinyl Alcohol