Enantioseparation of Nadifloxacin by High performance liquid Chromatography

A rapid isocratic chiral HPLC method has been developed for the separation of R-Nadifloxacin from S-Nadifloxacin. Good resolution viz. Rs> 4.0 between R- and S- forms of Nadifloxacin was achieved by RP-HPLC using endcappedC18 stationary phase and chiral mobile phase. Chirality to the mobile phase was imparted with addition of β-CD in phosphate buffer with EDTA.Column temperature was 45°C and flow rate was kept 1.5 mL min-1.The elution was monitored by UV-vis detector at λ-290 nm. The calibration curve showed excellent linearity over concentration range 0.040-20 μg mL-1.This method was further used to determine the amount of R-Nadifloxacin in pure and active pharmaceutical ingredient of S-Nadifloxacin and is capable to quantitate and detect R-Nadifloxacin to the levels of 0.040μg mL-1and 0.020μg mL-1 respectively. The average recovery of R-Nadifloxacin was 99.09 %. The method is better than the already reported one for the enantioseparation of the Nadifloxacin.