Characterization of temperature-induced phase transitions in five polymorphic forms of sulfathiazole by terahertz pulsed spectroscopy and differential scanning calorimetry
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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; Rades, Thomas.
In: Journal of Pharmaceutical Sciences, Vol. 95, No. 11, 2006, p. 2486-98.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Characterization of temperature-induced phase transitions in five polymorphic forms of sulfathiazole by terahertz pulsed spectroscopy and differential scanning calorimetry
AU - Zeitler, J Axel
AU - Newnham, David A
AU - Taday, Philip F
AU - Threlfall, Terry L
AU - Lancaster, Robert W
AU - Berg, Rolf W.
AU - Strachan, Clare J
AU - Pepper, Michael
AU - Gordon, Keith C
AU - Rades, Thomas
N1 - Copyright 2006 Wiley-Liss, Inc. and the American Pharmacists Association
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
U2 - 10.1002/jps.20719
DO - 10.1002/jps.20719
M3 - Journal article
C2 - 16892211
VL - 95
SP - 2486
EP - 2498
JO - Journal of Pharmaceutical Sciences
JF - Journal of Pharmaceutical Sciences
SN - 0022-3549
IS - 11
ER -
ID: 40357381