title: Polymer membrane electrodes for sensitive potentiometric determination of beta-blockers.
abstract: The construction of PVC matrix-type beta-blockers (sotalol, carvedilol, and betaxolol) ion selective electrodes and their use for direct potentiometry of their respective species are described. The proposed sensors are based on the complex ion associates of beta-blockers with tungstophosphate (TP) and Ammonium Reineckate (Rein) ionophoris in poly vinyl chloride membrane (PVC) with Dioctylphthalate (DOP) plasticizer. The four electrodes (Beta-TP), (Sota-TP), (Carve-TP), and (Cave-Rein) show stable potential response with near Nernstian slope of 50.8, 33.7, 32.35, and 33 mv per decade, range of concentration 10-2-10-7 M beta-blockers. Selectivity coefficients data obtained for 11 different organic and inorganic ions are presented. The electrodes have fast response time (30 and 40 s) and were used over wide range of pH 4.5-8.5. Validation of the method according to the quality assurance standers shows suitability of proposed sensors for use in the quality control assessment of these drugs. The results obtained for the determination of beta-blockers with the proposed electrodes show average recoveries of 100.78% and a mean standard deviation of +/-1.2. The nominal are obtained. The data agree well with those obtained by standard methods.
authors.affiliation: National Organization for Drug Control and Research, Cairo, Egypt.
authors.forename: Anwar A
authors.initials: AA
authors.lastname: Wassil
authors.forename: Abd El-Ftaah  Bastawy
authors.initials: Ael-F
authors.lastname: Farag
authors.forename: Fatma A
authors.initials: FA
authors.lastname: Moukdad
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000032:analysis*; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D011143:Polyvinyl Chloride; D011199:Potentiometry / Q000379:methods*; D012680:Sensitivity and Specificity; D013696:Temperature
chemical_list: D000319:Adrenergic beta-Antagonists; D011143:Polyvinyl Chloride