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Irradiation of titanium dioxide generates both singlet oxygen and superoxide anion

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dc.contributor Australian Institute Of Marine Science
dc.contributor University Of Tokyo
dc.contributor Osaka City University
dc.contributor Adv Sci & Technol Res Ctr
dc.contributor Meguro Ku
dc.contributor Dept Biochem
dc.contributor Sch Med
dc.contributor Univ Tokyo
dc.contributor Australian Inst Marine Sci
dc.contributor Osaka City Univ
dc.contributor Australian Institute Of Marine Science (aims) en INOUE, M KONAKA, R KASAHARA, E DUNLAP, WC YAMAMOTO, Y CHIEN, KC 2017-03-21T00:54:20Z 2013-02-28T06:45:14Z 2013-02-28T06:45:14Z 2019-05-09T01:13:53Z 2013-02-28T06:45:14Z 2017-03-21T00:54:20Z 2017-03-21T00:54:20Z 2019-05-09T01:13:53Z 1999-08-01
dc.identifier 1679 en
dc.identifier.citation Konaka R, Kasahara E, Dunlap WC, Yamamoto Y, Chen KC and Inoue M (1999) Irradiation of titanium dioxide generates both singlet oxygen and superoxide anion. Free Radicals in Biology and Medicine. 27: 294-300. en
dc.identifier.issn 0891-5849
dc.description.abstract Although photoexcited TiO2 has been known to initiate various chemical reactions, such as the generation of reactive oxygen species, precise mechanism and chemical nature of the generated species remain to be elucidated. The present work demonstrates the generation of singlet oxygen by irradiated TiO2 in ethanol as measured by ESR spectroscopy using 2,2,6,6-tetramethyl-4-piperidone (4-oxo-TMP) as a O-1(2)-sensitive trapping agent. Under identical conditions, the superoxide ion was also detected by spin trapping agent 5,5-dimetbyl-pyrroline-N-oxide (DMPO). Kinetic analysis in the presence of both 4-oxo-TMP and DMPO revealed that singlet oxygen is produced directly at the irradiated TiO2 surface but not by a successive reaction Involving superoxide anion. The basis for this view is the fact that DMPO added in the mixture increased the signals responsible for 4-oxo-2,2,6,6-tetramethyl-1-piperidinyl (4-oxo-TEMPO), a reaction product of 4-oxo-TMP and O-1(2). The detailed mechanism for the generation of O-1(2) and superoxide ion by irradiated TiO2 and reactions between these species and DMPO are discussed. (C) 1999 Elsevier Science Inc.
dc.language English
dc.language en en
dc.relation.ispartof Free Radicals in Biology and Medicine - pages: 27: 294-300 en
dc.relation.ispartof Null
dc.subject Biochemistry & Molecular Biology
dc.subject Esr
dc.subject Superoxide Anion
dc.subject Oxidation
dc.subject Spin Trapping
dc.subject Hydrogen-peroxide
dc.subject Dismutation
dc.subject Free Radicals
dc.subject Photodynamic Reaction
dc.subject Singlet Oxygen
dc.subject Electron-transfer
dc.subject Endocrinology & Metabolism
dc.subject Titanium Dioxide
dc.subject Ion
dc.subject Water
dc.title Irradiation of titanium dioxide generates both singlet oxygen and superoxide anion
dc.type journal article en
dc.identifier.wos WOS:000082107500007

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