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Examining solution and solid state composition for the solution mediated polymorphic transformation of carbamazepine and piracetam

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Show simple item record O'Mahony, Marcus A Maher, Anthony Croker, Denise M. Rasmuson, Åke C. Hodnett, Benjamin K. 2013-01-15T11:11:03Z 2013-01-15T11:11:03Z 2012
dc.description peer-reviewed en_US
dc.description.abstract Solution mediated polymorphic transformations (SMPT) of the pharmaceutical compounds carbamazepine and piracetam have been investigated. Seeded transformation experiments were performed, and the solution concentration was monitored by in situ infra-red spectroscopy using a calibration free method. Solid samples were also taken over time, and the percentage of metastable and stable polymorphic phases were determined using off line quantitative powder X-ray diffraction analysis. Solution and solid state data were compared for each compound. In the case of carbamazepine, the SMPT from FI to FIII was identified as being controlled by the growth of the stable FIII polymorph. For piracetam, the SMPT was also identified as being controlled by growth of the stable polymorph, but with a more considerable induction time for nucleation of the stable phase. This paper demonstrates how the rate determining steps of the SMPT can be identified if both solution and solid phase data are recorded. The results are compared with other studies reported in the literature and rationalized into four principal scenarios. en_US
dc.language.iso eng en_US
dc.publisher American Chemical Society en_US
dc.relation.ispartofseries Crystal Growth & Design;12(4), pp 1925-1932
dc.rights This is the authors version of the work. Reprinted with permission from American chemical Society for your personal use not for redistribution. The definitive version was published in Crystal Growth and Design, Examining Solution and Solid State Composition for the Solution Mediated Polymorphic Transformation of Carbamazepine and Piracetam, 2012,12(4), pp. 1925-1932 DOI: 10.1021/cg201665z. © 2012 American Chemical Society en_US
dc.subject polymorphism en_US
dc.subject solution-mediated transformations en_US
dc.subject pharmaceuticals en_US
dc.title Examining solution and solid state composition for the solution mediated polymorphic transformation of carbamazepine and piracetam en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.contributor.sponsor SFI en_US
dc.relation.projectid 07/SRC/B1158 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 1387758

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