Abstract
19F NMR spectroscopy of a model fluoroquinolone, lomefloxacin, in an erythrocyte suspension showed separate resonances for the intra- and extra-cellular compartments. The intra-cellular peak revealed significant line broadening of the fluorine signals of lomefloxacin. Line broadening also occurred in the presence of oxyhemoglobin (HbO 2), hematin, globin and iron. This evidence indicated that lomefloxacin interacted with these compounds; however, ultrafiltration experiments indicated that there was only weak binding (5%) of lomefloxacin to HbO 2. 19F and 31P NMR spectroscopy revealed that lomefloxacin may compete with 2,3-diphosphoglycerate for its binding site on HbO 2. An apparent partition coefficient of 1.90 ± 0.15 was observed for lomefloxacin in human erythrocytes, utilizing LC analysis.
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