Predicting the solubility of pharmaceutical cocrystals in solvent/anti-solvent mixtures

Loading...
Thumbnail Image

Date

2016-05-07

Journal Title

Journal ISSN

Volume Title

Publisher

Alternative Title(s)

Abstract

In this work, the solubilities of pharmaceutical cocrystals in solvent/anti-solvent systems were predicted using PC-SAFT in order to increase the efficiency of cocrystal formation processes. Modeling results and experimental data were compared for the cocrystal system nicotinamide/succinic acid (2:1) in the solvent/anti-solvent mixtures ethanol/water, ethanol/acetonitrile and ethanol/ethyl acetate at 298.15 K and in the ethanol/ethyl acetate mixture also at 310.15 K. The solubility of the investigated cocrystal slightly increased when adding small amounts of anti-solvent to the solvent, but drastically decreased for high anti-solvent amounts. Furthermore, the solubilities of nicotinamide, succinic acid and the cocrystal in the considered solvent/anti-solvent mixtures showed strong deviations from ideal-solution behavior. However, by accounting for the thermodynamic non-ideality of the components, PC-SAFT is able to predict the solubilities in all above-mentioned solvent/anti-solvent systems in good agreement with the experimental data.

Description

Table of contents

Keywords

Cocrystal, Crystal engineering, Thermodynamics, Solubility, Phase diagram, Solvent mixtures

Subjects based on RSWK

Kokristallisation, Pharmazeutische Chemie

Citation