Journal
INTERNATIONAL JOURNAL OF PHARMACEUTICS
Volume 554, Issue -, Pages 61-71Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijpharm.2018.10.044
Keywords
Celecoxib; Eutectic; Evaporation crystallization; Phase diagram; Tammann's Triangle; Contact angle
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Funding
- Ministry of Health & Welfare, Republic of Korea [HI13C1127]
- Basic Science Research Program [2017R1D1A1B03031213]
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning, Republic of Korea [2018R1A6A1A03023718]
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Celecoxib (CEL) is a selective cyclooxygenase-2 (COX-2) inhibitor therapeutically indicated for the treatment of rheumatoid arthritis, osteoarthritis, acute pain, and inflammation. However, its poor solubility and dissolution rate significantly hinders its broader application. In this study, eutectic mixtures, as binary pharmaceutical compositions of CEL with adipic acid (ADI) and saccharin (SAC), were identified through a phase diagram and Tammann's triangle intended to improve the wettability and dissolution rate of poorly water-soluble CEL. The contact angles at Os in the liquid-solid interface were approximately theta s (theta) 79.7 +/- 0.50 degrees and 86.65 +/- 0.45 degrees for CEL-ADI and CEL-SAC, respectively, which were much lower than the value obtained for CEL (92.05 +/- 0.75 degrees theta). Moreover, a comparison of the disk intrinsic dissolution rate and powder dissolution properties demonstrated that eutectic mixtures significantly increased the dissolution rate compared with CEL and physical mixtures. A general relationship was elucidated and indicated that the dissolution rate was increased as the contact angle decreased (correlation coefficient, r = 0.9966 +/- 0.0031). Therefore, CEL-ADI and CEL-SAC eutectics may offer a novel formulation strategy to enhance the solubility and oral bioavailability of CEL.
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