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Characterization of temperature-induced phase transitions in five polymorphic forms of sulfathiazole by terahertz pulsed spectroscopy and differential scanning calorimetry

Zeitler, J. Axel, Newnham, David A., Taday, Philip F., Threlfall, Terry L., Lancaster, Robert W., Berg, Rolf W., Strachan, Clare J., Pepper, Michael, Gordon, Keith C. and Rades, Thomas (2006) Characterization of temperature-induced phase transitions in five polymorphic forms of sulfathiazole by terahertz pulsed spectroscopy and differential scanning calorimetry Journal of Pharmaceutical Sciences, 95, (11), pp. 2486-2498. (doi:10.1002/jps.20719).

Record type: Article

Abstract

The far-infrared properties of all five known polymorphic forms of the drug sulfathiazole have been studied by terahertz pulsed spectroscopy and low-frequency Raman spectroscopy. The observed spectra of the different polymorphs are distinctly different. Terahertz pulsed spectroscopy proves to be a rapid and complementary alternative to other physical characterization techniques reported in the literature for distinguishing between the five forms. Variable-temperature measurements (293-473 K) of all polymorphic forms have been performed. The phase transitions observed have been related to thermal analysis data. Form I is the form stable at high temperature of sulfathiazole with a melting point of about 475 K. Form II melts at around 470 K and recrystallizes at higher temperatures to form I. Forms III, IV, and V all convert to form I via a solid-solid phase transition at temperatures below 450 K. The phase transitions can be monitored by terahertz pulsed spectroscopy. Polymorphic impurities of the samples can be detected in the room temperature spectra and their effect on the phase transition behavior can be studied.

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Published date: 2006
Keywords: terahertz pulsed spectroscopy (tps), low-frequency raman spectroscopy, far-infrared, sulfathiazole, polymorphism, phase transitions, differential scanning, calorimetry (dsc), high-speed dsc, physical characterization, lattice vibrations, time-domain spectroscopy, vibrational-spectra, carbamazepine, crystallinity

Identifiers

Local EPrints ID: 44569
URI: http://eprints.soton.ac.uk/id/eprint/44569
ISSN: 0022-3549
PURE UUID: 3c74890f-d3a5-4bd5-9279-f0217907ef85

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Date deposited: 07 Mar 2007
Last modified: 17 Jul 2017 15:14

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Contributors

Author: J. Axel Zeitler
Author: David A. Newnham
Author: Philip F. Taday
Author: Terry L. Threlfall
Author: Robert W. Lancaster
Author: Rolf W. Berg
Author: Clare J. Strachan
Author: Michael Pepper
Author: Keith C. Gordon
Author: Thomas Rades

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