Abstract
Purpose
Photoisomerization of the E/Z-alkene structures of drugs is a matter of concern as it could result in potency loss and adverse side effects. This study focused on light-induced isomerization of sulindac and ozagrel hydrochloride catalyzed by concomitant vitamin B2 under light-emitting diode (LED) or fluorescent light.
Methods
In the presence of 0.05/0.03 equivalents of vitamin B2/flavin adenine dinucleotide (FAD), sulindac or ozagrel hydrochloride was irradiated with LED light (405 nm) or fluorescent light. The photoisomerization in CD3OD and D2O was monitored by 1H NMR spectroscopy.
Results
Sulindac and ozagrel hydrochloride isomerized in the presence of a catalytic amount of vitamin B2 or FAD under irradiation of 405 nm LED light and fluorescent light. Irradiation with LED light was found to be more effective than fluorescent light irradiation. The rate of photoisomerization was affected by the solvent, and the reaction in CD3OD proceeded faster than in D2O. Furthermore, ozagrel hydrochloride was more prone to isomerization than sulindac.
Conclusion
The catalytic activity of vitamin B2 or FAD was demonstrated in the photoisomerization reaction of sulindac and ozagrel hydrochloride. Considering that the rate of photoisomerization in D2O is very slow, the possibility of the occurrence of photoisomerization during clinical use is low. However, this study suggests that the interfusion of vitamin B2 or FAD under excessive light exposure should be avoided as a caution during intravenous administration of sulindac or ozagrel hydrochloride.
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ACKNOWLEDGMENTS AND DISCLOSURES
The authors declare that they have no conflicts of interest.
Funding
This work was supported in part by a Grant-in-Aid for Young Scientists (19K16454) from the Japan Society for the Promotion of Science.
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Mayuko Suga, Kosho Makino, and Hideyo Takahashi contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Mayuko Suga, Kosho Makino, Hidetsugu Tabata, Tetsuta Oshitari, Natsugari Hideaki, and Hideyo Takahashi. The first draft of the manuscript was written by Mayuko Suga, Kosho Makino, and Hideyo Takahashi. All authors read and approved the final manuscript.
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Suga, M., Makino, K., Tabata, H. et al. Photoisomerization of Sulindac and Ozagrel Hydrochloride by Vitamin B2 Catalyst Under Visible Light Irradiation. Pharm Res 39, 577–586 (2022). https://doi.org/10.1007/s11095-022-03203-3
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DOI: https://doi.org/10.1007/s11095-022-03203-3