Novel Polymorphic Cocrystals of the Non-Steroidal Anti-Inflammatory Drug Niflumic Acid: Expanding the Pharmaceutical Landscape
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AuteurAcebedo Martínez, Francisco Javier; Alarcón Payer, Carolina; Di Crisci, Milena; Domínguez Martín, Alicia; Gómez Morales, Jaime; Choquesillo Lazarte, Duane
Cocrystal polymorphismNiflumic acidCaffeineNSAIDsMechanochemical synthesis
Acebedo-Martínez, F.J... [et al.]. Novel Polymorphic Cocrystals of the Non-Steroidal Anti-Inflammatory Drug Niflumic Acid: Expanding the Pharmaceutical Landscape. Pharmaceutics 2021, 13, 2140. [https://doi.org/10.3390/pharmaceutics13122140]
PatrocinadorSpanish Agencia Estatal de Investigacion of the Ministerio de Ciencia, Innovacion y Universidades (MICIU); European Commission PGC2018-102047-B-I00; FEDER-Universidad de Granada, Spain B-FQM-478-UGR20; MCIU/AEI of Spain PID2020-115637GB-I00 PRE2019-088832
Any time the pharmaceutical industry develops a new drug, potential polymorphic events must be thoroughly described, because in a crystalline pharmaceutical solid, different arrangements of the same active pharmaceutical ingredient can yield to very different physicochemical properties that might be crucial for its efficacy, such as dissolution, solubility, or stability. Polymorphism in cocrystal formulation cannot be neglected, either. In this work, two different cocrystal polymorphs of the non-steroidal anti-inflammatory drug niflumic acid and caffeine are reported. They have been synthesized by mechanochemical methods and thoroughly characterized in solid-state by powder and single crystal X-ray diffraction respectively, as well as other techniques such as thermal analyses, infrared spectroscopy and computational methods. Both theoretical and experimental results are in agreement, confirming a conformational polymorphism. The polymorph NIF–CAF Form I exhibits improved solubility and dissolution rate compared to NIF–CAF Form II, although Form II is significantly more stable than Form I. The conditions needed to obtain these polymorphs and their transition have been carefully characterized, revealing an intricate system.