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• W2071527178 abstract "The solid-state transformation of carbamazepine from form III to form I was examined by Fourier Transform Raman spectroscopy. Using a novel environmental chamber, the isothermal conversion was monitored in situ at 130 °C, 138 °C, 140 °C and 150 °C. The rate of transformation was monitored by taking the relative intensities of peaks arising from two CH bending modes; this approach minimised errors due to thermal artefacts and variations in power intensities or scattering efficiencies from the samples in which crystal habit changed from a characteristic prism morphology (form III) to whiskers (form I). The solid-state transformation at the different temperatures was fitted to various solid-state kinetic models of which four gave good fits, thus indicating the complexity of the process which is known to occur via a solid–gas–solid mechanism. Arrhenius plots from the kinetic models yielded activation energies from 344 kJ mol−1 to 368 kJ mol−1 for the transformation. The study demonstrates the value of a rapid in situ analysis of drug polymorphic type which can be of value for at-line in-process control." @default.
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• W2071527178 date "2004-10-01" @default.
• W2071527178 modified "2023-10-03" @default.
• W2071527178 title "Use of in situ FT-Raman spectroscopy to study the kinetics of the transformation of carbamazepine polymorphs" @default.
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• W2071527178 doi "https://doi.org/10.1016/j.jpba.2004.06.024" @default.
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