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- Title
Intermolecular interaction as a direct measure of water solubility advantage of meloxicam cocrystalized with carboxylic acids.
- Authors
Cysewski, Piotr
- Abstract
The solubility advantage (SA) of meloxicam cocrystalized with mono- and dicarboxylic acids was expressed in terms of equilibrium constants involving active pharmaceutical ingredient and coformer in aqueous solutions. It is argued that SA can be quantified by concentration of pairs formed in water. The pH and concentration of dissolved components is included explicitly in the model. The alternative behavior of mono- and dicarboxylic acids was emphasized and addressed to different structural motifs. The structural and energetic properties of meloxicam and its complexes with carboxylic acids were characterized, including tautmerism and dissociation in aqueous media. In particular, performed in silico modeling confirmed experimental observation that meloxicam dissolved in water or modest acidic solutions is expected to be a mixture of anionic form in equilibrium with at least five neutral isomers. Tautomer-related diversity of pairs formation and the possibility of salt formation is also discussed.Two types of motifs found in meloxicam cocrystals reveal two sources of solubility advantage<graphic></graphic>
- Subjects
INTERMOLECULAR interactions; SOLUBILITY; CARBOXYLIC acids; NONSTEROIDAL anti-inflammatory agents; EQUILIBRIUM constant (Chemistry)
- Publication
Journal of Molecular Modeling, 2018, Vol 24, Issue 5, p1
- ISSN
1610-2940
- Publication type
Article
- DOI
10.1007/s00894-018-3649-0