Song, S. -H. and Dick, B. and Penzkofer, Alfons (2007) Photo-induced reduction of flavin mononucleotide in aqueous solutions. CHEMICAL PHYSICS, 332 (1). pp. 55-65. ISSN 0301-0104,
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The photo-induced reduction of flavin mononucleotide (FMN) in aqueous solutions is studied by absorption spectra measurement under aerobic and anaerobic conditions. Samples without exogenous reducing agent and with the exogenous reducing agents ethylene-diamine-tetraacetic acid (EDTA) and dithiothreitol (DTT) are investigated. Under anaerobic conditions the photo-induced reduction with and without reducing agents is irreversible. Under aerobic conditions the photo-reduction without added reducing agent is small compared to the photo-degradation, and the photo-reduction of FMN by the reducing agents is reversible (re-oxidation in the dark). During photo-excitation of FMN the dissolved oxygen is consumed by singlet oxygen formation and subsequent chemical reaction. After light switch-off slow re-oxidation (slow absorption recovery) occurs due to air in-diffusion from surface. EDTA degradation by FMN excitation leads to oxygen scavenging. The quantum efficiencies of photo-reduction under aerobic and anaerobic conditions are determined. The re-oxidation of reduced FMN under aerobic conditions and due to air injection is investigated. (c) 2006 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SENSITIZED PHOTO-OXIDATION; BLUE-LIGHT RECEPTORS; SINGLET OXYGEN YIELDS; FLASH-PHOTOLYSIS; ELECTRON-TRANSFER; RIBOFLAVIN; MECHANISM; PHOTOREDUCTION; ABSORPTION; DOMAIN; flavin mononucleotide (FMN); ethylene-diamine-tetraacetic acid (EDTA); dithiothreitol (DTT); flavin photo-reduction; aerobic photoreduction; anaerobic photo-reduction; absorption spectroscopy; flavin re-oxidation; oxygen scavenging |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Alfons Penzkofer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Dec 2020 07:26 |
| Last Modified: | 23 Dec 2020 07:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/33284 |
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