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. 1970 Dec;120(4):673–681. doi: 10.1042/bj1200673e

Flavin-photosensitized reactions of retinal and stilbene

Ann Gordon-Walker 1,*, G K Radda 1
PMCID: PMC1179659  PMID: 5495148

Abstract

1. Retinol and stilbene are both isomerized when they are illuminated anaerobically in the presence of flavins. 2. Triplet quenchers (e.g. oxygen, potassium iodide and paramagnetic ions) inhibit the reaction more efficiently than they quench flavin fluorescence. At 77°C in a diethyl ether–isopentane–ethanol (5:5:2) glass retinol quenches flavin phosphorescence, but not its fluorescence. 3. For the stilbene reaction cis/trans photostationary-state mixtures are obtained with different flavins and these are linearly related to the phosphorescence transition energies of the flavins used. 4. The reaction involves the triplet state of flavin and a scheme for the reaction is suggested. 5. The dependence of the rate of reaction on substrate concentration is explicable in terms of this scheme. 6. The photobleaching of rhodopsin sensitized by flavin is also demonstrated.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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