title: Comparative physicochemical properties of hydrocortisone-PVP composites prepared using supercritical carbon dioxide by the GAS anti-solvent recrystallization process, by coprecipitation and by spray drying.
abstract: Hydrocortisone-PVP composites were successfully prepared using the supercritical fluid gas anti-solvent method (GAS). Analysis by differential scanning calorimetry DSC and powder X-ray diffraction (XRD) indicated that these systems were more crystalline than corresponding systems prepared by spray drying. These systems, prepared by the GAS method were more similar in physicochemical properties to coprecipitates prepared by conventional solvent evaporation. Compressed composites of hydrocortisone-PVP systems, prepared by the GAS method, had dissolution rates lower than those of corresponding systems prepared by the other processing methods but equivalent to those of corresponding physical mixtures.
authors.affiliation: Department of Pharmaceutics and Pharmaceutical Technology, School of Pharmacy, Trinity College, Dublin 2, Ireland. ocorrigan@tcd.ie
authors.forename: Owen I
authors.initials: OI
authors.lastname: Corrigan
authors.forename: Abina M
authors.initials: AM
authors.lastname: Crean
mesh_terms: D002245:Carbon Dioxide; D011232:Chemical Precipitation; D003460:Crystallization / Q000379:methods; D000431:Ethanol / Q000737:chemistry; D006854:Hydrocortisone / Q000737:chemistry*; D010592:Pharmaceutic Aids / Q000737:chemistry; D011205:Povidone / Q000737:chemistry*; D012995:Solubility; D012997:Solvents; D013678:Technology, Pharmaceutical / Q000379:methods
chemical_list: D010592:Pharmaceutic Aids; D012997:Solvents; D002245:Carbon Dioxide; D000431:Ethanol; D011205:Povidone; D006854:Hydrocortisone