Interaction of pharmaceutical hydrates with supercritical CO2 |
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Authors: | Bettini R. Bertolini G. Frigo E. Rossi A. Casini I. Pasquali I. Giordano F. |
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Affiliation: | (1) Department of Pharmacy, University of Parma, Parco Area delle Scienze 21/A, 43100 Parma, Italy;(2) Universitá di Parma Department of Pharmacy, Parco Area delle Scienze, 43100 Parma, Italy |
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Abstract: | The aim of this work was to study the solubility in supercritical CO2 of the hydrated phase of three model drugs, namely theophylline, carbamazepine, and diclofenac sodium, in comparison with the respective anhydrous form. Possible solid-state modifications, stemming from the interaction with supercritical CO2, were investigated by differential scanning calorimetry, thermogravimetric analysis, hot stage microscopy, Fourier Transform infrared spectroscopy and Karl-Fischer titrimetry. It was found that all three pharmaceutical hydrates exhibited higher solubility in supercritical CO2 than the relevant anhydrous phases. In the case of theophylline monohydrate, the instability of the crystal phase at the experimental temperature adopted has been evidenced. Diclofenac sodium tetrahydrate represents a peculiar case of chemical interaction with the acid supercritical fluid, mediated by crystal water. This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | solubility pseudopolymorphism theophylline carbamazepine supercritical CO2 hydrates diclofenac sodium solid-state chemistry |
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