1 July 2008 Optical detection of singlet oxygen produced by fatty acids and phospholipids under ultraviolet A irradiation
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J. of Biomedical Optics, 13(4), 044029 (2008). doi:10.1117/1.2960553
Abstract
Ultraviolet A (UVA) radiation has been known to generate reactive oxygen species, such as singlet oxygen, in skin, leading to the oxidation of lipids and proteins. This oxidation influences cellular metabolism and can trigger cellular signaling cascades, since cellular membranes and the stratum corneum contain a substantial amount of fatty acids and lipids. Using highly sensitive IR-photomultiplier technology, we investigated the generation of singlet oxygen by fatty acids and lipids. In combination with their oxidized products, the fatty acids or lipids produced singlet oxygen under UVA radiation at 355 nm that is directly shown by luminescence detection. Linolenic or arachidonic acid showed the strongest luminescence signals, followed by linoleic acid and docohexaenoic acid. The amount of singlet oxygen induced by lipids such as phosphatidylcholine was significantly higher compared to the corresponding fatty acids within phospholipids. This result indicates a synergistic process of oxygen radicals and singlet oxygen during irradiation. UVA radiation initiates singlet oxygen generation, which subsequently oxidizes other fatty acids that in turn produce additional singlet oxygen. This leads to an enhancement of UVA-induced damage of fatty acids and lipids, which must enhance the oxidative damages in cells.
Jürgen Baier, Tim Maisch, Johannes Regensburger, Claudia Pollmann, Wolfgang Baeumler, "Optical detection of singlet oxygen produced by fatty acids and phospholipids under ultraviolet A irradiation," Journal of Biomedical Optics 13(4), 044029 (1 July 2008). http://dx.doi.org/10.1117/1.2960553
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KEYWORDS
Oxygen

Luminescence

Absorption

Molecules

Ultraviolet radiation

Signal detection

Singular optics

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