METHODS AND OBJECTS OF CHEMICAL ANALYSIS ISSN title: "Metody i obʺekty himičeskogo analiza" An international journal devoted to all aspects of Analytical chemistry ISSN 2413-6166 (Online), ISSN 1991-0290 (Print)
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THE USE OF AZO DYE ERIOHROM BLUE-BLACK R FOR SPECTROPHOTOMETRIC DETERMINATION OF SULFANILAMIDES IN FINISHED DOSAGE FORMS

M.Ya. Boiko^1,2, T.Ya. Vrublevska², O.Ya. Korkuna², G.Yu. Teslyar¹

¹Laboratory instrumentation control methods, State Scientific Research Control Institute of Veterinary Preparations and Fodder Additives, Donetska Str.,11, 79019, Lviv, Ukraine
²Analytical Chemistry Department, Chemistry Faculty, Ivan Franko National University, Kyryla and Mefodia Str., 6, 79005, Lviv, Ukraine

The conditions of sulphanilamide diazonium salt interaction with o,o'-dihydroxysubstituted azo dye eriohrom blue-black R have been established. The method of sulphanilamides spectrophotometric determination in finished dosage forms based on the azocoupling reaction of sulphanilamide diazonium salt with the product of the dye redox destruction, viz. β-naphthol, forming a new azo compound has been elaborated. The spectrophotometric characteristics of ten sulphanilamides analytical forms with azo dye (λ=485 nm, ε=(1.1–2.3)∙10³ L∙mol^-1∙cm^-1) and the validation parameters of the developed method (linearity range is 6–64 µg/ml) have been calculated.

Key words: sulphanilamides, eriohrom blue-black R, spectrophotometry, finished dosage forms

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