Characterization and crystal structure of D-mannitol hemihydrate

Cletus Nunes, Raj Suryanarayanan, Cristian E. Botez, Peter W. Stephens

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58 Scopus citations

Abstract

The objectives of this study were (i) to isolate and characterize mannitol hydrate, and (ii) to solve its crystal structure from high-resolution synchrotron X-ray powder diffraction data. Mannitol hydrate was prepared by freeze-drying aqueous mannitol solutions (5% w/v) under controlled conditions. X-ray powder diffractometry, differential scanning calorimetry, and thermogravimetric analyses indicated that mannitol exists as a hemihydrate (C6H14O6 · 0.5H2O). Synchrotron data were collected on the X3B1 beamline at the National Synchrotron Light Source. The simulated annealing program PSSP was used to solve the structure, which was subsequently refined by Rietveld analysis using the program package GSAS. The compound crystallizes in space group P1, with a = 9.8963 Å, b = 10.5424 Å, c = 4.7860 Å, α = 102.589°, β = 86.092°, and γ = 116.079°. The unit cell contains two dissimilar D-mannitol molecules and one water molecule, forming a hydrogen bonding pattern significantly different from that seen in the anhydrous polymorphs.

Original languageEnglish (US)
Pages (from-to)2800-2809
Number of pages10
JournalJournal of Pharmaceutical Sciences
Volume93
Issue number11
DOIs
StatePublished - Nov 2004

Keywords

  • Crystal structure
  • Freeze-drying
  • Hydrate
  • Physical characterization
  • Polymorph
  • Thermal analysis
  • X-ray diffractometry

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