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Skorobogatov, E. V.; Timchenko, Yu. V.; Doroshenko, I. A.; Podrugina, T. A.; Rodin, I. A.; Beklemishev, M. K.
Journal of analytical chemistry (New York, N.Y.), 04/2024, Letnik: 79, Številka: 4Journal Article
Substitution reactions in carbocyanine dyes are used to determine nucleophilic compounds. The interaction of a chlorine-containing carbocyanine dye with a number of medicinal substances is studied. It is shown that, in the reaction with isoniazid in the presence of a surfactant, this dye selectively changes color from yellow-green to violet. The formation of a product of the substitution of chlorine for isoniazid is proven by chromatography–mass spectrometry. The reaction proceeds in 20 min in the presence of 1 mM cetyltrimethylammonium bromide. The limit of detection for isoniazid in water by the photometric method is 10 μg/mL and in diluted artificial urine using fluorimetry, 0.3 μg/mL. The procedure does not use full-spectrum equipment, which simplifies the determination.
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