Improving Tabletability of Excipients by Metal-Organic Framework-Based Cocrystallization: a Study of Mannitol and CaCl.

PURPOSE

To improve tabletability of pharmaceutical excipient mannitol by forming cocrystal with metal-organic framework (MOF) structure.

METHODS

Mannitol was cocrystallized with CaCl by slurry method and solvent evaporation method. The obtained cocrystal was characterized by SCXRD, PXRD, and thermal analysis. Comparative study on tabletability between cocrystal and β-mannitol were then conducted. Differences in tabletability were subsequently analyzed using the bonding area-bonding strength (BA-BS) model and correlated with their crystal structures.

RESULTS

The prepared cocrystal contains mannitol, CaCl and water in molar ratio of 1:1:2 (i.e. mannitol·CaCl·2HO) and all the Ca in the cocrystal are linked together by mannitol molecules through an infinite coordination network, demonstrating a typical MOF structure. Compared with β-mannitol, such MOF-based cocrystal showed improved tabletability (2-fold increased tensile strength) and reduced lamination tendency (3-fold increased minimum compaction pressure to occur lamination). The tabletability improvement of cocrystal was dominated by its higher BS, which is attributed to stronger intermolecular interactions. The reduced lamination tendency was attributed to its lower in-die elastic recovery than β-mannitol.

CONCLUSIONS

MOF-based cocrystallization will be a promising and valuable approach to tailor mechanical properties of pharmaceutical materials in order to achieve better pharmaceutical performance.