Abstract
The thermal behaviour of khellin has been studied by thermomicroscopy, differential scanning calorimetry, differential thermal analysis and measurement of transparency. The polymorphism of this drug has been established; the commercial form (I) melting at 153.3° and the form (II) melting at 150.3° have been identified, and their enthalpies (7725±166 cal·mole−1, 6668±230 cal·Mol−1) and entropies (18.17±0.41,15.76± 0.54) of fusion evaluated, while the degree of purity of form (I) has been determined.
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