Gollmer, Anita and Regensburger, Johannes and Maisch, Tim and Baeumler, Wolfgang (2013) Luminescence spectroscopy of singlet oxygen enables monitoring of oxygen consumption in biological systems consisting of fatty acids. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 15 (27). pp. 11386-11393. ISSN 1463-9076,
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The interaction of singlet oxygen (O-1(2)) generated in a photosensitized process with well-known reference photosensitizers Perinaphthenone (PN) and TMPyP is investigated in a model system consisting of fatty acids and the respective exogenous photosensitizer (PS) in solution by direct detection of the luminescence photons of O-1(2) at 1270 nm. Such a model system is a first approach to mimic the complex environment of O-1(2) in a biological cell which consists mainly of water, proteins, sugars and lipids. Firstly, the important issue of oxygen consumption is evaluated which has to be considered during luminescence detection of O-1(2). It is known that the luminescence signal of O-1(2) is dependent on the oxygen concentration of the environment. Cellular components such as lipids represent oxygen consumers due to peroxidation of their unsaturated double bonds. Secondly, the experimental conditions for this model system regarding oxygen consumption are optimized to estimate the rates and rate constants of the coupled system. Thirdly, the triplet decay of the PS can provide more precise information about the actual oxygen concentration close to the PS and can be used, therefore, as a more precise method to determine the oxygen concentration in more complex systems such as a biological cell. The aim is to get a better understanding of photosensitized reactions of O-1(2) with cellular components to further improve methodologies, in particular at a cellular level using luminescence spectroscopy. In conclusion, luminescence detection might be a helpful tool to monitor precisely and promptly changes in oxygen concentration in a complex environment.
Item Type: | Article |
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Uncontrolled Keywords: | PHOTODYNAMIC THERAPY; MOLECULAR-OXYGEN; EFFECTOR ACTION; CELLS; INACTIVATION; IRRADIATION; GENERATION; SENSITIZER; BACTERIA; PHENALENONE; |
Subjects: | 600 Technology > 610 Medical sciences Medicine |
Divisions: | Medicine > Lehrstuhl für Dermatologie und Venerologie |
Depositing User: | Dr. Gernot Deinzer |
Date Deposited: | 28 Apr 2020 14:06 |
Last Modified: | 28 Apr 2020 14:06 |
URI: | https://pred.uni-regensburg.de/id/eprint/17403 |
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