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Published on: June 6, 2025
Analysis of the polymorph changes of a drug candidate
P Láng1, E Várkonyi2, J Ulrich3
1Department of Pharmaceutical Technology, University of Szeged, Eötvös u. 6, H-6720 Szeged, Hungary.
Abstract:
The effects of solvents, temperature and humidity on the stability of a former drug candidate obtained from Sanofi (Hungary) were examined by a slurry equilibration method, variable temperature and humidity X-ray powder diffractometry (VT/VH-XRPD) and differential scanning calorimetry (DSC). The VH-XRPD study showed that all 8 polymorphic forms of this material were stable in the interval 20-80 RH%. The VT-XRPD measurements indicated that all the polymorphs except Form II underwent changes in the range 30-200°C. The stable form was Form II, though Form IVb had almost the same stability. The investigation demonstrated that VT-XRPD is a very useful in situ method for relative stability studies.
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