Determination of ofloxacin and dexamethasone in Dexaflox eye drops through different ratio spectra manipulating methods

Publication date: December 2013 Source:Bulletin of Faculty of Pharmacy, Cairo University, Volume 51, Issue 2 Author(s): M. Nebsen , Ghada M. Elsayed , M. AbdelKawy , S.Z. ELkhateeb Different sensitive and selective spectrophotometric methods for the determination of ofloxacin and dexamethasone in their binary mixture were presented. Ofloxacin was determined simply by zero order at its λ max 293.4nm in a linear range of 1.5–12μgmL−1 with mean percentage recovery of 100.07±0.66% without any interference of dexamethasone even in low or high concentrations. Dexamethasone was determined by first derivative of ratio spectra 1DD at 266.5nm, ratio subtraction and mean centering at 243nm with methods in a linear range of 2.5–27.5μgmL−1 with mean percentage recoveries of 100.09±0.70%, 100.00±0.72% and 99.92±0.62, respectively. These methods were applied to the analysis of pharmaceutical dosage form and bulk powder where good recoveries were obtained. The proposed methods were validated according to USP guidelines. Graphical abstract
Source: Bulletin of Faculty of Pharmacy, Cairo University - Category: Drugs & Pharmacology Source Type: research