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Abstract— The photooxidation of reduced lumiflavin in its acidic form, LfH 3 + , takes place in two consecutive steps. Upon illumination of LfH 3 + in its absorption band at 313 nm the semiquinone, LfH 3 + , is formed. Two LfH 2 + ions are consumed for every LfH 2 + formed. Illumination of the semiquinone in its absorption band at 495 nm causes further oxidation so that the oxidized LfH+ ion is formed. In this reaction one LfH 3 + ion is photolyzed for every LfH+ formed. In addition, a hydrogen atom is released in the photooxidation of LfH 2 + . Mechanisms for the two photoreactions are proposed. 相似文献
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Abstract— The reactivity of flavin mononucleotide and of lumiflavin triplets was studied by flash and laser photolysis. The rate constants of the triplets with oxygen, with flavin ground-state molecules, and with Br- ions were determined. Although in solution at room temperature, the protonated flavin triplet, 3 F1H+ , is not formed directly from its very short lived singlet state, a transient, which we think is this triplet, results from protonation of the neutral triplet. This conclusion is based on a comparison between the neutral and the protonated triplet spectra in a low-temperature glass. It is proposed that the protonated triplet can also be formed by sensitization via the phenanthrene triplet. 相似文献
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