Polymorphism of sulfathiazole

Anwar, Jamshed and Tarling, Stephen E. and Barnes, Paul (1989) Polymorphism of sulfathiazole. Journal of Pharmaceutical Sciences, 78 (4). pp. 337-342. ISSN 0022-3549

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Abstract

The polymorphism of sulfathiazole has been reexamined. The issue of the separate existence of two of the forms, forms III and IV, has now been definitively resolved: both forms exist. Single crystals were used to generate X-ray diffraction patterns, equivalent to those normally obtained from polycrystalline samples, using the ingenious Gandolfi camera. The patterns obtained were distinct and in agreement with the theoretical powder patterns calculated from the reported structures of the two forms, thus confirming the separate existence. Disagreement between the results of previous workers has been traced to two main causes: characterization techniques are not very discriminating for the two forms (III and IV), and the samples examined have invariably been mixtures of III and IV, since the two forms usually crystallize together. Furthermore, crystals of form III exhibit marked preferred orientation, which complicates powder X-ray diffraction (PXRD) analysis. The IR, Raman, and 13C NMR spectra, and PXRD patterns are reported for all four forms. These distinct fingerprints should now enable one to isolate pure samples and to study the properties and the relationships between these forms with full confidence.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Pharmaceutical Sciences
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3000/3003
Subjects:
?? pharmaceutical science ??
ID Code:
62221
Deposited By:
Deposited On:
15 Feb 2013 16:29
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jul 2024 13:35