Pseudopolymorphic transitions of niclosamide monitored by Raman spectroscopy
authors Sardo, M; Amado, AM; Ribeiro-Claro, PJA
nationality International
journal JOURNAL OF RAMAN SPECTROSCOPY
author keywords niclosamide; hydration/dehydration; Raman spectroscopy; relative humidity; kinetics
keywords SOLID-STATE REACTIONS; PHARMACEUTICAL SOLIDS; CRYSTAL FORMS; POLYMORPHISM; KINETICS; DENSITY; ENERGY; THEOPHYLLINE; STABILITY; HYDRATION
abstract Niclosamide suffers pseudopolymorphic transformations when exposed to different ambient conditions, which can lead to changes in its bioavailability. In this study, the kinetics of the pseudopolymorphic transitions of niclosamide crystals are characterized. FT-Raman spectroscopy is used to quantify the anhydrate and hydrate forms of niclosamide crystals, mostly because of its high sensitivity to the strong intermolecular interactions present in these systems. The samples are exposed to well-characterized relative humidity (RH) conditions during different periods of time and both water diffusion and polymorphic changes are monitored from the corresponding changes observed in the vibrational spectra. Both hydration and dehydration were found to be single-step processes, with a half-life time of ca. 142 and 63 h, respectively, at 24 degrees C. Copyright (C) 2008 John Wiley & Sons, Ltd.
publisher JOHN WILEY & SONS LTD
issn 0377-0486
year published 2008
volume 39
issue 12
beginning page 1915
ending page 1924
digital object identifier (doi) 10.1002/jrs.2058
web of science category Spectroscopy
subject category Spectroscopy
unique article identifier WOS:000262017700023
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