title: Spectrophotometric and titrimetric determination of nizatidine in capsules.
abstract: Four simple and accurate methods are described for the determination of nizatidine (NIZ) in pharmaceutical preparations. The first method is based on the formation of an ion-pair complex between the drug and either of bromocresol purple or picric acid with subsequent measurement of the developed colors at 411 and 400 nm, respectively. The second method depends on the condensation of mixed anhydrides of citric acid/acetic anhydride, with the tertiary amino group of the drug, where the developed color is measured spectrophotometrically at 545 nm. The oxidation of nizatidine by N-bromosuccinimide was utilized as a basis for the titrimetric method for its assay in capsules. The last method depends on the oxidation of nizatidine by ammonium cerium IV sulfate in the presence of perchloric acid with subsequent measurement of the absorbance at 314 nm; this principle is adopted to develop a kinetic method for the determination of NIZ in capsules. All the reaction conditions have been studied. The detection limits were varied from 0.44 to 0.78 microg ml(-1). The proposed methods were successfully applied to the assay of nizatidine in capsules.
authors.affiliation: Faculty of Pharmacy, Department of Pharmaceutical Analytical Chemistry, University of Alexandria, El-Messalah, Alexandria 21521, Egypt. pharmacy_alex@hotmail.com
authors.forename: F A
authors.initials: FA
authors.lastname: El-Yazbi
authors.forename: Azza A
authors.initials: AA
authors.lastname: Gazy
authors.forename: Hoda
authors.initials: H
authors.lastname: Mahgoub
authors.forename: M A
authors.initials: MA
authors.lastname: El-Sayed
authors.forename: Rasha M
authors.initials: RM
authors.lastname: Youssef
mesh_terms: D000089:Acetic Anhydrides; D000645:Ammonium Sulfate; D002214:Capsules; D019343:Citric Acid; D006635:Histamine H2 Antagonists / Q000032:analysis*; D007202:Indicators and Reagents; D016567:Nizatidine / Q000032:analysis*; D010084:Oxidation-Reduction; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013053:Spectrophotometry; D017186:Titrimetry
chemical_list: D000089:Acetic Anhydrides; D002214:Capsules; D006635:Histamine H2 Antagonists; D007202:Indicators and Reagents; D019343:Citric Acid; C031800:acetic anhydride; D016567:Nizatidine; D000645:Ammonium Sulfate