Abstract— Fluorescence and phosphorescence spectra of lumiflavine, riboflavine, FMN and FAD have been measured by continuous and flash excitation techniques. The differences in emission characteristics observed, show that the flavine side‐chains afect the singlet‐triplet transitions on which chemical and biological activity of flavine systems depend.

Abstract— Flavines in the excited state can effect anaerobic oxidation of amino acids to keto acid and ammonia. The rate of the process depends on the structure of the amino acid. These systems show similarities to the amino acid oxidases.

Abstract— Kinetics of fluorescence quenching and photoreduction of lumiflavine by methionine in anaerobic aqueous solution show that the flavine reacts in the excited triplet state at a diffusion controlled rate. Individual rate constants and activation energies are determined for the process.

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