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Protonation equilibrium and lipophilicity of moxifloxacin

Langlois MH, Montagut M, Dubost JP, Grellet J, Saux MC

Journal of pharmaceutical and biomedical analysis, 2005

106 citations

Abstract

This study was performed to characterise the protonation equilibrium at the molecular level and pH-dependent lipophilicity of moxifloxacin. After determining macro- and micro-constants, distribution features of four microspecies in aqueous phase were assessed. The apparent partition coefficient versus pH profile of moxifloxacin showed a parabolic curve in n-octanol/buffer system which reached near pI. The true partition coefficient was calculated from the log P(app) and microconstants values.

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