title: Solubility and prediction of the heat of solution of sodium naproxen in aqueous solutions.
abstract: The solubility of sodium naproxen was determined over a range of temperatures from 15.2 degrees C to 39.7 degrees C by two methods: analyses of samples from equilibrated solutions and a recently developed procedure utilizing a focused-beam reflectance method (FBRM). The results demonstrate the utility of the newer and, in some cases, simpler method. A discontinuity in the solubility was observed at 29.8 degrees C, identifying the temperature as which the dihydrate and anhydrous forms of sodium naproxen trade places as being the more stable of the two forms. The heats of solution for the two pseudopolymorphs were obtained from van't Hoff plots of the solubility data. These results were used to demonstrate how the heat of solution of one form can be estimated using the heat of dehydration obtained from differential scanning calorimetry (DSC) and the heat of solution from another form.
authors.affiliation: School of Chemical & Biomolecular Engineering Georgia Institute of Technology Atlanta, Georgia 30332-0100, USA.
authors.forename: Young-Soo
authors.initials: YS
authors.lastname: Kim
authors.forename: José R
authors.initials: JR
authors.lastname: Méndez del Río
authors.forename: Ronald W
authors.initials: RW
authors.lastname: Rousseau
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D007834:Lasers; D009288:Naproxen / Q000737:chemistry*; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012964:Sodium / Q000737:chemistry; D012995:Solubility; D012996:Solutions / Q000737:chemistry*; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D012996:Solutions; D014867:Water; D009288:Naproxen; D012964:Sodium