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Published on: August 2, 2016
Hydration, stability, and phase transformations of a new antitumor drug
A Marini1, V Berbenni, G Bruni
1C.S.G.I., Dipartimento di Chimica Fisica dell'Università degli Studi di Pavia, Via Taramelli 16, 27100 Pavia, Italy. marini@matsci.unipv.it
Abstract:
We studied hydration equilibria and phase transformations in a cytotoxic drug (BBR3576). The original sample is a hydrated compound that undergoes a structural phase transition when it looses about half of its structural water. Such a structural transition is completely reversible: the partially dehydrated form is stable up to 130 degrees C (or up to 140 degrees C for several minutes) and reverts to the original form upon rehydration. Completely different phase relationships are observed if an original sample is fully dehydrated: when all water has been released, a metastable anhydrous phase forms, which undergoes an irreversible exothermic conversion to a stable phase. Upon rehydration at room temperature of such an anhydrous phase, a new hydrated form is obtained, which is definitely different from the original one.
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