title: Sensitive indirect spectrophotometric determination of isoniazid.
abstract: A simple, rapid, sensitive and accurate indirect spectrophotometric method for the microdetermination of isoniazid (INH) in pure form and pharmaceutical formulations is developed. The procedure is based on the reaction of copper(II) with isoniazid in the presence of neocuproine (NC). In the presence of neocuproine, copper(II) is reduced easily by isoniazid to a Cu(I)-neocuproine complex, which shows an absorption maximum at 454 nm. By measuring the absorbance of the complex at this wavelength, isoniazid can be determined in the range 0.3-3.5 microgml-1. This method was applied to the determination of isoniazid in pharmaceutical formulation and enabled the determination of the isoniazid in microgram quantities (0.3-3.5 microgml-1). The results obtained for the assay of pharmaceutical preparations compared well with those obtained by the official method and demonstrated good accuracy and precision.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Shiraz University, Shiraz 71454, Iran. safavi@chem.susc.ac.ir
authors.forename: A
authors.initials: A
authors.lastname: Safavi
authors.forename: M A
authors.initials: MA
authors.lastname: Karimi
authors.forename: M R
authors.initials: MR
authors.lastname: Hormozi Nezhad
authors.forename: R
authors.initials: R
authors.lastname: Kamali
authors.forename: N
authors.initials: N
authors.lastname: Saghir
mesh_terms: D000995:Antitubercular Agents / Q000032:analysis / Q000494:pharmacology; D003300:Copper / Q000737:chemistry; D004305:Dose-Response Relationship, Drug; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007538:Isoniazid / Q000032:analysis* / Q000494:pharmacology; D008956:Models, Chemical; D010618:Phenanthrolines / Q000494:pharmacology; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000379:methods*; D013997:Time Factors
chemical_list: D000995:Antitubercular Agents; D007477:Ions; D010618:Phenanthrolines; D003300:Copper; C002701:neocuproine; D007538:Isoniazid