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Potentiometric Determination of Moxifloxacin by ZnO Nanorodes Modified ion Selective Electrode
Malaz Osman Idress, Abdalla A. Elbashir* and Omer Nur
Potentiometric determination of moxifloxacin (Moxi) by ion selective electrode based on ZnO nanorods incorporation with HPβ-CD as sensing ionophore and (KTFPB) potassium tetrakis- (3,5(triflouromethyl) phenyl borate ion as anionic site (additive) in polyvinyl chloride (PVC) membrane, without inner reference solution was developed. The sensor shows nearly nernstian response over a concentration range ( 5 × 10-8 M to 1 × 10-2 M) with a slope of 21.9 ± 0.16 mv decade-1 of concentration with a limit of detection (LOD) 0.127 μM. The electrode exhibits a fast dynamic response of 2 s for a period of 6 months without significant change in its characteristics with excellent stability and sensitivity toward inorganic species. The method is accurate and precise as indicated by the mean recoveries 99.5% with RSD less than 2%. The proposed method was successfully applied for the determination of Moxi in pure form and its pharmaceutical formulations.