| Autor: |
Reiko Yutani, Ryotaro Haku, Reiko Teraoka, Chisato Tode, Tatsuo Koide, Shuji Kitagawa, Toshiyasu Sakane, Toshiro Fukami |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Crystals, Vol 9, Iss 11, p 553 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2073-4352 |
| DOI: |
10.3390/cryst9110553 |
| Popis: |
Carbamazepine (CBZ), a widely used antiepileptic, is known to be sensitive to light. The aim of this study was to evaluate the photostabilities of three cocrystals of CBZ (CBZ−succinic acid (SUC), CBZ−saccharin (SAC) form I, and CBZ−SAC form II) illuminated with a D65 fluorescent lamp compared with those of the conventional solid forms: CBZ polymorphs (forms I, II, and III). The order of discoloration determined using a colorimetric measurement was almost consistent with that of the degradation rates estimated using Fourier-transform infrared reflection−absorption spectroscopy, and these parameters of CBZ polymorphs increased in the order of form III, form I, and form II. CBZ−SUC and CBZ−SAC form I significantly suppressed the discoloration and degradation of CBZ compared with the raw CBZ, while CBZ−SAC form II facilitated the discoloration and degradation of CBZ. These results were supported by the results from the low-frequency Raman spectroscopy. The molecular mobility estimated using solid-state nuclear magnetic resonance 1H spin−lattice relaxation time strongly correlated with the degradation rate constant, indicating that molecular mobility significantly decreased following the formation of CBZ−SUC and CBZ−SAC form I and resulted in higher photostability. Overall, CBZ−SUC and CBZ−SAC form I are photostable forms and cocrystallization was proven to be an effective approach to improving the photostability of a photolabile drug. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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