Peroxyoxalate Photoinduced Chemiluminescence Detection of Norfloxacin in Pharmaceutical Products by Flow Injection Analysis

A new method for the determination of norfloxacin by flow injection analysis based on photoinduced chemiluminescence detection is proposed. We have selected the peroxyoxalate (PO) reaction based on the possibility of detecting fluorescent products derived from a photochemically induced decomposition of norfloxacin, observing high signal when the derivative participates in the reaction. A FIA device, with two-injection valves for the introduction of both the PO and the photodecomposed analyte solutions in the flow system, has been used, avoiding the problems arising from the use of organic solvents. The method was applied to the monitoring of norfloxacin in pharmaceuticals.