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Application ofmembrane selective electrodes for stability indicating determination of bambuterolHCLin presence of itsmetabolite terbutaline in its pharmaceutical dosage forms and in plasma

KhadigaM.Kelani, Wafaa E.Hassan, SheriefM.Eid, AbdallaA.Shalaby4

Two polyvinyl chloride (PVC) membrane sensors for the determination and quantification of Bambuterol HCL (BH) in presence of its acid degradation product (Terbutaline) were described and characterized. The sensors are based on the use of ion association complexes of BH cation with Phosphotungestic acid (PTA) counter anions as ion exchange sites in the PVC matrix(BH-PTA sensor 1) or â- Cyclodextrin (â-CD) to form inclusion complex (BH-â-CD sensor 2). The performance characteristics of the sensors were evaluated according to IUPAC recommendations, reveal a fast, stable and linear response over the concentration range 10-5- 10-2 M for BH.The recoveries for determination of BH by the two proposed selective electrodes were 99.96 ± 0.694, 99.98 ± 0.387, for sensor 1 and sensor 2, respectively. Statistical comparison between the results obtained by this method and the official Pharmacopoeial method of BH was done, and no significant difference was found.