No abstract

Sensitive, economic, simple and accurate spectrophotometric method for estimation of ampicillin in bulk and dosage form is described. Ampicillin was oxidized by sodium hypochlorite and coupling with sulfanilic acid in the presence of sodium hydroxide to obtain a stable yellow colored chromogen which exhibit a maximum absorption (λ max ) at 400 nm. The optimum conditions were carefully evaluated .Plot of absorbance against concentration was linear over the range (50-300 µg.ml -1 ). This method was applied to the estimation of ampicillin in pure drug and commercial formulations successfully.

Simple, rapid and sensitive extractive spectrophotometric method is presented for the determination of glibenclamide (Glb) based on the formation of ion-pair complex between the Glb and anionic dye, methyl orange (MO) at pH 4. The yellow colored complex formed was quantitatively extracted into dichloromethane and measured at 426 nm. The colored product obeyed Beer’s law in the concentration range of (0.5-40) μg.ml-1. The value of molar absorptivity obtained from Beer’s data was found to be 31122 L.mol-1.cm-1, Sandell’s sensitivity value was calculated to be 0.0159 μg.cm-2, while the limits of detection (LOD) and quantification (LOQ) were found to be 0.1086 and 0.3292 μg.ml-1, respectively. The stoichiometry of the complex created between the Glb and MO was 1:1 as determined via Job’s method of continuous variation and mole ratio method. The method was successfully applied for the analysis of pharmaceutical formulation.