Abstract
A rapid , simple, accurate and sensitive spectrophotometric method was developed for determination of mebendazole ( MBL ) in pure form and in its pharmaceutical dosages. This method depend on oxidation of MBL with excess amount of N-bromosuccinimide ( NBS ) in acidic medium with standing for complete the reaction , and the oxidized MBL coupled with Rhodamine B to get red product related with MBL amount and measuring the absorbance of surplus dye at 570 nm. A linear calibration curve was obtained over the concentration range 2.5 – 30 μg.ml-1 with correlation coefficient of 0.9992. The molar absorptivity and sandell's sensitivity index values were determined to be 1.476 × 104 L.mol-1.cm-1 and 0.02 μg.cm-2. The limit of detection (LOD) and quantification (LOQ) were calculated to be 0.469 and 1.982 μg.ml-1, respectively . The proposed method has been successfully applied to the determination of MBL in available dosage form, the validity proposed method was confirmed by recovery study via standard addition technique.
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