Abstract
A spectral-luminescent study of the keto-enol tautomerism of 5-fluorouracil (FU) has been performed. A discrepancy between the absorption and fluorescence (FL) excitation spectra of aqueous FU solutions (pH 7) has been established. Photoexcitation at the long-wavelength band (340 nm) of the FU excitation spectrum made it possible to detect the fluorescence of its dienol tautomer (λmax = 440 nm). The quenching of tryptophan fluorescence (K = 15 × 103 l/mol) and blood fluorescence by 5-fluorouracil has been investigated.
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