Solubility of Dexamethasone in Supercritical Carbon Dioxide with and without a Cosolvent

The solubility of dexamethasone, a synthetic glucocorticoid, in supercritical CO2 and together with 3.0 mol % ethanol as a cosolvent was measured at different temperatures (313.2, 318.2, and 323.2) K and pressures ranging from (10.0 to 25.0) MPa by a static analytical method. The obtained solubility of dexamethasone was between 1.19·10–6 and 1.52·10–6 in pure supercritical CO2 and between 1.97·10–6 and 2.98·10–6 in supercritical CO2 with a cosolvent. The experimental data in supercritical CO2 in the absence and presence of a cosolvent were correlated using four density-based semiempirical models, that is, Chrastil, Kumar and Johnston, Bartle, and Méndez-Santiago and Teja models. The results indicated that the Kumar and Johnston model gave a better correlated result than the other three with an average absolute relative deviation [AARD (%)] value lower than 2.15 %.

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