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Investigation into the Solid and Solution Properties of Known and Novel Polymorphs of the Antimicrobial Molecule Clofazimine
journal contribution
posted on 2016-11-07, 00:00 authored by Pauric Bannigan, Jacek Zeglinski, Matteo Lusi, John O’Brien, Sarah P. HudsonClofazimine
is an anti-mycobacterial agent used as part of a multidrug treatment
for leprosy. Recently clofazimine has shown promising activity against
multidrug resistant tuberculosis. Clofazimine has been previously
known to exist in two different crystal forms, or polymorphs, which
are triclinic (F I) and monoclinic (F II) in crystal structure. The
thermodynamic relationship between, and the solubility of, these different
crystal structures of clofazimine has not previously been characterized.
In this work, their solid and solution properties are studied, and
as a result, two novel polymorphs of clofazimine (an orthorhombic
crystal polymorph and a high temperature polymorph with a monoclinic
structure) are reported. The properties of these new solid forms are
compared and contrasted with those of the two previously reported
polymorphs using thermal, spectroscopic, and microscopic techniques.
Molecular modeling studies were also carried out to predict the relative
thermodynamic relationship and the crystal morphology of the polymorphs.
There was an excellent correlation observed between the aforementioned
experimental and molecular modeling results, allowing for the unequivocal
determination of the thermodynamic relationship between all four polymorphs
of clofazimine.
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clofaziminecrystal structuretemperature polymorphcrystal polymorphcrystal morphologycrystal structuresanti-mycobacterial agentrelationshipcrystal formsNovel PolymorphsAntimicrobial Molecule Clofazimine Clofaziminesolution propertiesmultidrug treatmentmodeling resultsF IIMolecular modeling studiesnovel polymorphsSolution Properties
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