Fluorometric Method for the Determination of Gemifloxacin Mesylate in Bulk and Pharmaceutical Formulations Using Tb3+ Ions in the Presence of Hexamine

Abstract

A simple and highly sensitive method for the determination of Gemifloxacin Mesylate in bulk drug and pharmaceutical formulations. The method is based on the reaction of Gemifloxacin Mesylate with Tb3+ in the presence of hexamine at pH 7.2. The fluorescence was measured at 545 nm after excitation at 271 nm. The calibration graph was linear over the range 0.05–1.3 µg mL, with minimum quantification limit (LOQ) of 0.024 µg mL and minimum limit of detection (LOD) of 7.65×10-3 µg mL. The proposed method was successfully applied for the determination of this drug in its dosage forms