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- Title
From a binary salt to salt co-crystals of antibacterial agent lomefloxacin with improved solubility and bioavailability.
- Authors
Zhang, Zhi-Hui; Zhang, Qi; Zhang, Qing-Qing; Chen, Chen; He, Ming-Yang; Chen, Qun; Song, Guo-Qiang; Xuan, Xiao-Peng; Huang, Xian-Feng
- Abstract
The cocrystallization of lomefloxacin (Lf) with barbituric acid (HBA) and/or isophthalic acid (H2ip) leads to novel binary and ternary salts via hydrogen-bonding recognition. X-ray single-crystal diffraction analyses show that zwitterionic lomefloxacin can adjust itself to fulfill a different supramolecular array in either binary salts or ternary salt co-crystals, formulated as [HLf]·[Hip]·H2O (1), [HLf]·[BA]·[HBA]·H2O (2) and [HLf]·[BA]·[H2ip]·CH3OH·H2O (3). These pharmaceutical agents present uniform charge-assisted hydrogen-bonding networks between HLf cations and acidic coformers with the lattice capturing water molecules. Structural comparison of (2) and (3) indicated that a delicate balance of geometries and hydrogen-bonding partners is required for stacking to favor the formation of ternary salt co-crystals. Cocrystallization was able to overcome the water insolubility of lomefloxacin. Both the salt co-crystals display enhanced solubility and better pharmaceutical applicability.
- Subjects
CRYSTALLIZATION; FLUOROQUINOLONES; SOLUBILITY; HYDROGEN bonding; ZWITTERIONS
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2015, Vol 71, Issue 4, p437
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S2052520615011191