Fluorescence detection of hydroxyl radicals |
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| Institution: | 1. Department of Chemistry, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0610, USA;2. Department of Radiology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0610, USA;1. Laboratory of Catalytic – Photocatalytic Processes and Environmental Analysis, Institute of Nanoscience & Nanotechnology, National Center for Scientific Research “Demokritos”, Patriarchou Grigoriou & Neapoleos, 15310, Agia Paraskevi, Athens, Greece;2. Water Quality Department, Athens Water Supply and Sewerage Company (EYDAP SA), Oropou 156, 11146, Galatsi, Athens, Greece;3. Department Chemistry and Biochemistry, Florida International University, Miami, FL, 33199, USA;4. Environmental Engineering and Science Program, Department of Biomedical, Chemical and Environmental Engineering (DBCEE), University of Cincinnati, Cincinnati, OH, 45221-0012, USA;1. Research Group of Environmental Chemistry, Institute of Chemistry, University of Szeged, H-6720, Szeged, Tisza Lajos krt. 103, Hungary;2. Department of Applied and Environmental Chemistry, University of Szeged, H-6720, Szeged, Rerrich tér 1, Hungary;3. Faculty of Physics, Babes-Bolyai University, RO-400084, Cluj-Napoca, M. Kogalniceanu 1, Romania;4. Institute for Interdisciplinary Research on Bio-Nano-Sciences, Babes-Bolyai University, RO-400271, Cluj-Napoca, Treboniu Laurian 42, Romania;5. Institute of Environmental Science and Technology, University of Szeged, H-6720, Szeged, Tisza Lajos krt. 103, Hungary;6. Department of Process Engineering, Faculty of Engineering, University of Szeged, H-6725, Szeged, Moszkvai krt. 9, Hungary;1. School of Chemistry and Chemical Engineering, Queen''s University Belfast, Belfast BT9 5AG, United Kingdom;2. School of Biological Sciences, Queen''s University Belfast, Medical Biology Centre, Belfast BT9 7BL, United Kingdom |
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| Abstract: | The hydroxyl radical ( OH), a product of water radiolysis, reacts to hydroxylate aromatic organic compounds. In some cases, these hydroxylated products are fluorescent. Examples include the benzoate, coumarin, and phenoxazinone systems. For representative members of these systems, we have determined both the rate constants for reaction with OH and the yields of the fluorescent products. The rate constants all fall in the range 2×109 to 2×1010 L mol?1 s?1, and the yields 5–11% per OH. These results suggest that it may prove feasible to construct a probe consisting of two groups both of which must react with OH to become fluorescent. The efficient process of fluorescence resonance energy transfer implies that such a probe might be able to detect OH clusters, which are generally assumed to be a characteristic feature of energy deposition by ionizing radiation. |
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