Premium
PROFLAVINE‐SENSITIZED PHOTOOXIDATION OF METHIONINE
Author(s) -
JORI GIULIO,
CAUZZO GIULIO
Publication year - 1970
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1970.tb06054.x
Subject(s) - proflavine , photochemistry , chemistry , quenching (fluorescence) , triplet state , methionine , singlet state , singlet oxygen , excited state , methionine sulfoxide , ion , kinetics , oxygen , fluorescence , molecule , organic chemistry , biochemistry , dna , physics , amino acid , quantum mechanics , nuclear physics
— A study was made of the kinetics of the proflavine‐sensitized photooxidation of methionine to methionine sulfoxide. The reaction is inhibited by the paramagnetic ions Cu 2+ and Mn 2+ , which suggests that the triplet state of the sensitizer is an intermediate. A mechanism is proposed in which methionine reacts with the first singlet state of oxygen, produced by energy transfer from the triplet sensitizer. The decrease in the rate of photooxidation with increasing proflavine concentration is ascribed to self‐quenching of the excited singlet state of the dye.