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New Solid Forms of Griseofulvin: A Solvate and a Relict Polymorph Related to Reported Solvates.

ABSTRACT: This work presents two new solid forms, a polymorph and a solvate, of the antifungal active pharmaceutical ingredient griseofulvin (GSF). The novel forms were characterized by powder X-ray diffraction, differential scanning calorimetry, and thermogravimetric analysis, and their crystal structures were determined by single-crystal X-ray diffraction. The new polymorphic form (GSF Form VI) was obtained upon drying at room temperature the GSF-acetonitrile solvate. GSF Form VI is a relict structure related to reported solvates of GSF. Thermal stability studies show that Form VI is metastable and monotropically related to the stable GSF Form I. The new GSF-n-butyl acetate solvate was obtained by crystallization from an n-butyl acetate solution. The stoichiometry of the n-butyl acetate solvate is 1:0.5. The solvate loses the solvent from the crystal lattice at a temperature between 363.15 and 374.15 K.

SUBMITTER: Diniz MO

PROVIDER: S-EPMC10704485 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature

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New Solid Forms of Griseofulvin: A Solvate and a Relict Polymorph Related to Reported Solvates.

Diniz Mariana O MO Spoletti Enrico E Ghosh Peuli P Lusi Matteo M Svärd Michael M Rasmuson Åke Å Hudson Sarah P SP

Crystal growth & design 20231115 12

This work presents two new solid forms, a polymorph and a solvate, of the antifungal active pharmaceutical ingredient griseofulvin (GSF). The novel forms were characterized by powder X-ray diffraction, differential scanning calorimetry, and thermogravimetric analysis, and their crystal structures were determined by single-crystal X-ray diffraction. The new polymorphic form (GSF Form VI) was obtained upon drying at room temperature the GSF-acetonitrile solvate. GSF Form VI is a relict structure r ...[more]

PMID: 38076529

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