Journal
CRYSTALS
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/cryst12101420
Keywords
ibuprofen; tranexamic acid; salt; crystal structure; swell
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This study investigated the mechanism of swelling in Ibuprofen (IBP) and Tranexamic acid (TXA) tablets during high-temperature storage. The results showed the formation of a new complex in the swollen tablets, which was closely related to the crystal structures of IBP and TXA.
Ibuprofen (IBP)- and Tranexamic acid (TXA)-containing tablets are known to swell when stored at high temperatures, but the mechanism of swelling is unknown. In this study, we investigated the possible mechanism of swelling with high-temperature storage. Differential scanning calorimetry (DSC) and powder X-ray diffractometry (PXRD) analyses showed that a new complex was formed in swollen tablets, when stored at 50 degrees C for 60 days. Additionally, we prepared single crystals of IBP and TXA, and analyzed them using single crystal X-ray diffractometry (SCXRD), to identify the new complex formed during storage. This revealed that the single crystal was a salt consisting of IBP and TXA. The PXRD peak of the salt simulated by SCXRD matched that of the PXRD peak of the swollen tablet after storage. These results suggest a close relationship between the swelling and crystal structures of IBP and TXA.
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