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AN INVESTIGATION OF RETINAL AS A SOURCE OF SINGLET OXYGEN
Author(s) -
Delmelle M.
Publication year - 1978
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.1751-1097.1978.tb07671.x
Subject(s) - singlet oxygen , photochemistry , retinal , quantum yield , chemistry , solvent , deuterium , acceptor , absorption (acoustics) , octane , oxygen , fluorescence , organic chemistry , materials science , optics , biochemistry , physics , quantum mechanics , composite material , condensed matter physics
— All ‐trans retinal is dissolved in alcohols and illuminated at 365 nm in the presence of a singlet oxygen acceptor, 2,5‐dimethylfuran. Illumination produces the photosensitized oxidation of the acceptor which is measured by the disappearance of its 215 nm absorption band. A kinetic study is carried out and β DMF is 1.6 × 10 ‐ ‐ 4 M . The quantum yield of 1 O 2 production from the light‐excited retinal is estimated to 0.096. The retinal sensitized photooxidation of dimethylfuran is inhibited by a 1 O 2 quencher, 1,4‐diazabicyclo(2,2,2)‐octane, and enhanced by deuteration of the solvent. Deuterated solvents are known to increase 1 O 2 lifetime. The production of 1 O 2 from retinal is briefly discussed in relation to the damage which may be induced by light in the visual cells.