The process of adrenaline autoxidation in an alkaline medium (pH=10.65) in the presence of sulfite was experimentally studied by UV-Vis spectroscopy. The absorption spectra of the final product of autoxidation (λm = 290—300 nm, εm = 8400 М–1 · cm–1 ), the intermediate adduct of adrenochrome with sulfite (λm = 343 nm, εm= 68000 М–1 · cm–1), and the reactive an intermediate product, presumably adrenolutin (λm = 311, εm = 140000 М–1 · cm–1 and λm = 373 nm, εm = 129000 М–1 · cm–1) were determined with experimental data processing. The estimated equilibrium constant for the formation of adrenochrome adduct with sulfite 5000 M-1
agrees with the literature data for carbonyl compounds. The results obtained explain the contradictions in the results of various authors concerning the oxidation and autoxidation of adrenaline in an alkaline medium.
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