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Application of membrane selective electrodesfor stability indicating determination of bambuterol HCLin presence of its m

Application of membrane selective electrodesfor stability indicating determination of bambuterol HCLin presence of its m

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 u201a- Cyclodextrin (u201a-CD) to form inclusion complex (BH-u201a-CD sensor 2). The performance characteristics of the sensors were evaluated according to IUPAC rec- ommendations, 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 u00b1 0.694, 99.98 u00b1 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

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Modified membrane sensors applied for determination of cetrizine in presence of its degradation product

Modified membrane sensors applied for determination of cetrizine in presence of its degradation product

The construction and electrochemical response characteristics of modified PVC, coated graphite and modified carbon paste electrodes were de- scribed. The cited electrodes used for determination of cetirizine hydro- chloride (CTZ) in presence of its oxidative degradation product were based on the use of ion-association complex of the cetirizinium cation (CTZ ) with phosphotungestic acid (PTA). It reveals a fast, stable and linear re- sponse for (CTZ) overthe concentration ranges 5x10 -5 - 1x10 -2 , 5x10 -5 - 1x10 - 2 and 1x10 -5 - 1x10 -2with slopes of 59.68, 56.03 and 61.6 mV/decade -1 respectively. The proposed electrodes were fully characterized in terms of ion pair contents, plasticizer type, response time, life span, pH and temperature. The performance characteristics, sensitivity and selectivity of these electrodes were evaluated according to IUPAC recommendations

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