title: Understanding the dehydration of levofloxacin hemihydrate.
abstract: Levofloxacin is a broad-spectrum antibiotic that exists as a hemihydrate under ambient conditions. In addition to the hemihydrate, there are three known crystalline anhydrate forms, denoted as α, β, and γ. In this study, differential scanning calorimetry (DSC), thermogravimetric analysis, Raman spectroscopy, single-crystal and powder X-ray diffraction, and solid-state NMR spectroscopy were used to investigate the transitions that occurred upon dehydration to the anhydrate as well as additional transitions that occurred to the anhydrous material upon heating/cooling. An enantiotropic conversion was observed in the DSC around 54°C corresponding to the conversion of the γ form to a new form, denoted as the δ form. Raman spectroscopy, powder X-ray diffraction, and solid-state NMR spectroscopy confirmed that a new crystalline form was being produced.
authors.affiliation: Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, Kansas 66047, USA.
authors.forename: Eric M
authors.initials: EM
authors.lastname: Gorman
authors.forename: Brian
authors.initials: B
authors.lastname: Samas
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Munson
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D018360:Crystallography, X-Ray; D003890:Desiccation; D064704:Levofloxacin; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015242:Ofloxacin / Q000737:chemistry*; D033362:Powder Diffraction; D013059:Spectrum Analysis, Raman; D013678:Technology, Pharmaceutical / Q000379:methods*; D013696:Temperature; D013818:Thermogravimetry; D014867:Water / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D014867:Water; D064704:Levofloxacin; D015242:Ofloxacin