Abstract
Introduction
In this article, we demonstrate the application of cooling crystallization to generate novel solid forms of drug-coformer cocrystal complexes.
Method
This approach enabled us to replicate several cocrystal phases previously reported for pharmaceutical drugs. Additionally, we successfully produced a new solid mixture comprising the drug luliconazole and coformers such as mannitol and menthol, as well as a potential new crystal form of the cocrystal luliconazole:menthol and luliconazole:mannitol. By utilizing cooling crystallization, we were able to prepare phase-pure LCZ-MNT and LCZ-MNL cocrystals.
Result
This study utilized PXRD, thermal methods, and FTIR to analyze cocrystals formed between drug and two coformers, menthol (MNT) and mannitol (MNL). Pure luliconazole showed−345.26 mJ heat of fusion (ΔH) and cocrystals with menthol and mannitol showed−516.19 mJ and−566.46 mJ respectively. The cocrystals showed lower heats of fusion (ΔH) compared to luliconazole, indicating the possibility of increased entropy and solubility for all cocrystals. Both the coformer and drug components showed band shifts in their spectra. A new solid phase was assumed to have formed if the PXRD of the cocrystal product differed from that of the reactants. Pure luliconazole resulted in 6.91 µg/ml solubility and cocrystal with menthol resulted in 26.87 µg/ml solubility. Using cooling crystallization with the menthol coformer resulted in a fivefold increase in cocrystal solubility compared to pure drug. The study also demonstrated improvements in drug dissolution.
Conclusion
The DSC analysis showed that the cooling crystallization method resulted in cocrystals with lower heats of fusion. The results of FTIR studies, the drug, and coformer showed only weak interactions, creating the new solid form. PXRD data indicated that the cooling crystallization method modified the crystal habits. Solubility and dissolution studies revealed that cocrystals of luliconazole could be an effective approach for enhancing its solubility.
Graphical Abstract
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Acknowledgements
I owe my humble thanks to Bioderma Laboratoire for providing gift sample of luliconazole. I owe my deepest gratitude to Mr. Krupal Shanishchara for continuous support and guidance towards this research project.
Funding
The Department of Technical Education, Government of Gujarat, India, provided the financial assistance (minor research grant) provided under the SSIP (Student Startup & Innovation Policy) scheme and KS Patel Centre for Entrepreneurship, RK University for this project.
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Aghara, M., Dudhat, K. Solubility and Dissolution Enhancement of Luliconazole by a Cocrystal Engineering Technique with Different Coformers. J Pharm Innov 18, 1701–1712 (2023). https://doi.org/10.1007/s12247-023-09751-4
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DOI: https://doi.org/10.1007/s12247-023-09751-4