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Hinoshita M, Abe T, Sato A, Maeda Y, Takeyoshi M. Modified ESR-based photosafety test (ESR-PT) detecting singlet oxygen and free radical formation. J Appl Toxicol 2024; 44:651-662. [PMID: 38058230 DOI: 10.1002/jat.4569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 11/21/2023] [Accepted: 11/21/2023] [Indexed: 12/08/2023]
Abstract
The electron spin resonance-based photosafety test (ESR-PT) was modified using a new parameter, photoreactivity index (PRI), to detect singlet oxygen and free radical photoproducts simultaneously. With this modification, the modified ESR-PT is expected to reduce the number of false negative results due to chemicals producing free radical photoproducts other than singlet oxygen. The assay performance of the modified ESR-PT was evaluated using 56 chemicals, including hydrophobic chemicals. When using the PRI cutoff value of 2.0 in the modified ESR-PT, the accuracy relative to photosafety reference data was 91.1%, and the applicability (100%) was better than the other non-animal photosafety test. Among the chemicals producing positive results, bithionol, fenticlor, and doxycycline HCl were considered positive based on the detection of free radical photoproducts, suggesting that these three chemicals may have phototoxic or photoallergic potential via radical reactions. Additionally, this finding demonstrated the fundamental advantage of the modified ESR-PT using ESR spectroscopy, which can detect radicals selectively and quantitatively. Accordingly, the new parameter PRI is effective for photosafety evaluations based on not only singlet oxygen but also free radical photoproducts generated from chemicals. Therefore, the modified ESR-PT has a great potential for a photosafety test method applicable to various chemicals.
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Affiliation(s)
- Masumi Hinoshita
- CERI Osaka, Chemicals Evaluation and Research Institute, Osaka, Japan
| | - Takayuki Abe
- CERI Tokyo, Chemicals Evaluation and Research Institute, Tokyo, Japan
| | - Asako Sato
- Chemicals Assessment and Research Center, Chemicals Evaluation and Research Institute, Tokyo, Japan
| | - Yosuke Maeda
- Chemicals Assessment and Research Center, Chemicals Evaluation and Research Institute, Tokyo, Japan
| | - Masahiro Takeyoshi
- Chemicals Assessment and Research Center, Chemicals Evaluation and Research Institute, Tokyo, Japan
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2
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Hu Z, Liu S, Qin H, Zhou J, Peng X. Oxygen Stabilizes Photoluminescence of CdSe/CdS Core/Shell Quantum Dots via Deionization. J Am Chem Soc 2020; 142:4254-4264. [DOI: 10.1021/jacs.9b11978] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Zhuang Hu
- Center for Chemistry of Novel & High-Performance Materials, and Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Shaojie Liu
- Center for Chemistry of Novel & High-Performance Materials, and Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Haiyan Qin
- Center for Chemistry of Novel & High-Performance Materials, and Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Jianhai Zhou
- Center for Chemistry of Novel & High-Performance Materials, and Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
| | - Xiaogang Peng
- Center for Chemistry of Novel & High-Performance Materials, and Department of Chemistry, Zhejiang University, Hangzhou 310027, People’s Republic of China
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3
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Kőrösi L, Bouderias S, Csepregi K, Bognár B, Teszlák P, Scarpellini A, Castelli A, Hideg É, Jakab G. Nanostructured TiO 2-induced photocatalytic stress enhances the antioxidant capacity and phenolic content in the leaves of Vitis vinifera on a genotype-dependent manner. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 190:137-145. [PMID: 30529924 DOI: 10.1016/j.jphotobiol.2018.11.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 11/18/2018] [Accepted: 11/19/2018] [Indexed: 01/22/2023]
Abstract
Over the past decades, nanotechnology has received great attention and brought revolutionary solutions for a number of challenges in scientific fields. Industrial, agricultural and medical applications of engineered nanomaterials have increased intensively. The ability of titanium dioxide nanoparticles (TiO2 NPs) to produce reactive oxygen species (ROS), when excited by ultra-violet (UV) light, makes them useful for effectively inactivate various pathogens. It is known that ROS also have signalling role in living organisms, therefore, TiO2 NPs-induced ROS can influence both enzymatic and non-enzymatic defence systems, and could play a role in the resistance of plants to pathogens. Herein, we studied the photocatalytic stress responses of grapevine (Vitis vinifera L.) as model plant, when exposed to a well-known photocatalyst, Degussa P25 TiO2 NPs. The photocatalytically produced ROS such as superoxide anion, hydroxyl radical and singlet oxygen were confirmed by electron paramagnetic resonance spectroscopy. Foliar exposure of five red cultivars (Cabernet sauvignon, Cabernet franc, Merlot, Kékfrankos and Kadarka) was carried out in blooming phenophase under field condition where plants are exposed to natural sunlight with relatively high UV radiation (with a maximum of ~ 45 W m-2). After two weeks of exposure, the effects of photogenerated ROS on the total phenolic content, antioxidant capacity, flavonol profile and the main macro-, microelements of the leaves were studied in detail. We found that foliar application of TiO2 NPs boosted the total phenolic content and biosynthesis of the leaf flavonols depending on the grapevine variety. Photocatalytically active TiO2 NPs also increased K, Mg, Ca, B and Mn levels in the leaves as shown by ICP-AES measurements.
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Affiliation(s)
- László Kőrösi
- Research Institute for Viticulture and Oenology, University of Pécs, Pázmány P. u. 4, Pécs H-7634, Hungary.
| | - Sakina Bouderias
- Research Institute for Viticulture and Oenology, University of Pécs, Pázmány P. u. 4, Pécs H-7634, Hungary; Department of Plant Biology, University of Pécs, Ifjúság u. 6, Pécs H-7624, Hungary
| | - Kristóf Csepregi
- Department of Plant Biology, University of Pécs, Ifjúság u. 6, Pécs H-7624, Hungary
| | - Balázs Bognár
- Institute of Organic and Medicinal Chemistry, University of Pécs, Szigeti st. 12, H-7624 Pécs, Hungary
| | - Péter Teszlák
- Research Institute for Viticulture and Oenology, University of Pécs, Pázmány P. u. 4, Pécs H-7634, Hungary
| | - Alice Scarpellini
- Electron Microscopy Facility, Istituto Italiano di Tecnologia, via Morego 30, Genova 16163, Italy
| | - Andrea Castelli
- Department of Nanochemistry, Istituto Italiano di Tecnologia, via Morego 30, Genova 16163, Italy
| | - Éva Hideg
- Department of Plant Biology, University of Pécs, Ifjúság u. 6, Pécs H-7624, Hungary
| | - Gábor Jakab
- Research Institute for Viticulture and Oenology, University of Pécs, Pázmány P. u. 4, Pécs H-7634, Hungary; Department of Plant Biology, University of Pécs, Ifjúság u. 6, Pécs H-7624, Hungary
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Isaka Y, Kondo Y, Kawase Y, Kuwahara Y, Mori K, Yamashita H. Photocatalytic production of hydrogen peroxide through selective two-electron reduction of dioxygen utilizing amine-functionalized MIL-125 deposited with nickel oxide nanoparticles. Chem Commun (Camb) 2018; 54:9270-9273. [DOI: 10.1039/c8cc02679c] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photocatalytic H2O2 production via two-electron reduction of O2 is realized by visible-light irradiation of a Ti-based metal–organic framework, MIL-125-NH2.
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Affiliation(s)
- Yusuke Isaka
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
| | | | - Yudai Kawase
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
| | - Yasutaka Kuwahara
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB)
| | - Kohsuke Mori
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB)
| | - Hiromi Yamashita
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB)
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Zielinski Goldberg M, Burke LA, Samokhvalov A. Selective Activation of C=C Bond in Sustainable Phenolic Compounds from Lignin via Photooxidation: Experiment and Density Functional Theory Calculations. Photochem Photobiol 2015; 91:1332-9. [PMID: 26268649 DOI: 10.1111/php.12509] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 08/04/2015] [Indexed: 11/29/2022]
Abstract
Lignocellulosic biomass can be converted to high-value phenolic compounds, such as food additives, antioxidants, fragrances and fine chemicals. We investigated photochemical and heterogeneous photocatalytic oxidation of two isomeric phenolic compounds from lignin, isoeugenol and eugenol, in several nonprotic solvents, for the first time by experiment and the density functional theory (DFT) calculations. Photooxidation was conducted under ambient conditions using air, near-UV light and commercial P25 TiO2 photocatalyst, and the products were determined by TLC, UV-Vis absorption spectroscopy, HPLC-UV and HPLC-MS. Photochemical and photocatalytic oxidation of isoeugenol proceeds via the mild oxidative "dimerization" to produce the lignan dehydrodiisoeugenol (DHDIE), while photooxidation of eugenol does not proceed. The DFT calculations suggest a radical stepwise mechanism for the oxidative "dimerization" of isoeugenol to DHDIE as was calculated for the first time.
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Affiliation(s)
| | - Luke A Burke
- Chemistry Department, Rutgers University, Camden, NJ
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Bobeničová M, Valko M, Brezová V, Dvoranová D. UVA generated free radicals in irinotecan (CPT-11) in the presence of copper ions. J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.06.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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Chen L, Mizukado J, Suzuki Y, Kutsuna S, Aoyama Y, Yoshida Y, Suda H. An ESR study on superoxide radical anion generation and its involvement in the photooxidative degradation of poly-3-hexylthiophene in chlorobenzene solution. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.05.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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8
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Paul B, Locke A, Martens WN, Frost RL. Decoration of titania nanofibres with anatase nanoparticles as efficient photocatalysts for decomposing pesticides and phenols. J Colloid Interface Sci 2012; 386:66-72. [DOI: 10.1016/j.jcis.2012.07.069] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Revised: 07/19/2012] [Accepted: 07/23/2012] [Indexed: 10/28/2022]
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9
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Shiraishi Y, Sugano Y, Ichikawa S, Hirai T. Visible light-induced partial oxidation of cyclohexane on WO3 loaded with Ptnanoparticles. Catal Sci Technol 2012. [DOI: 10.1039/c1cy00331c] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Khachatryan L, Vejerano E, Lomnicki S, Dellinger B. Environmentally persistent free radicals (EPFRs). 1. Generation of reactive oxygen species in aqueous solutions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:8559-66. [PMID: 21823585 PMCID: PMC3230252 DOI: 10.1021/es201309c] [Citation(s) in RCA: 181] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Reactive oxygen species (ROS) generated by environmentally persistent free radicals (EPFRs) of 2-monochlorophenol, associated with CuO/silica particles, were detected using the chemical spin trap, 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), in conjunction with electron paramagnetic resonance (EPR) spectroscopy. Yields of hydroxyl radical ((•)OH), superoxide anion radical (O(2)(•-)), and hydrogen peroxide (H(2)O(2)) generated by EPFR-particle systems were reported. Failure to trap superoxide radicals in aqueous solvent, formed from reaction of EPFRs with molecular oxygen, results from fast transformation of the superoxide to hydrogen peroxide. However, formation of superoxide as an intermediate product in hydroxyl radical formation in aprotic solutions of dimethyl sulfoxide (DMSO) and acetonitrile (AcN) was observed. Experiments with superoxide dismutase (SOD) and catalase (CAT) confirmed formation of superoxide and hydrogen peroxide, respectively, in the presence of EPFRs. The large number of hydroxyl radicals formed per EPFR and monotonic increase of the DMPO-OH spin adduct concentration with incubation time suggest a catalytic cycle of ROS formation.
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Affiliation(s)
- Lavrent Khachatryan
- Department of Chemistry and LSU Superfund Research Center, Louisiana State University , Baton Rouge, Louisiana 70803, United States
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11
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Samokhvalov A. Heterogeneous photocatalytic reactions of sulfur aromatic compounds. Chemphyschem 2011; 12:2870-85. [PMID: 21809426 DOI: 10.1002/cphc.201100101] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2011] [Revised: 06/09/2011] [Indexed: 11/10/2022]
Abstract
Sulfur aromatic compounds, such as mono-, di-, tri-, and tetraalkyl-substituted thiophene, benzothiophenes, dibenzothiophenes, are the molecular components of many fossils (petroleum, oil shale, tar sands, bitumen). Structural units of natural, cross-linked heteroaromatic polymers present in brown coals, turf, and soil are similar to those of sulfur aromatic compounds. Many sulfur aromatic compounds are found in the streams of petroleum refining and upgrading (naphthas, gas oils) and in the consumer products (gasoline, diesel, jet fuels, heating fuels). Besides fossils, the structural fragments of sulfur aromatic compounds are present in molecules of certain organic semiconductors, pesticides, small molecule drugs, and in certain biomolecules present in human body (pheomelanin pigments). Photocatalysis is the frontier area of physical chemistry that studies chemical reactions initiated by absorption of photons by photocatalysts, that is, upon electronic rather than thermal activation, under "green" ambient conditions. This review provides systematization and critical review of the fundamental chemical and physicochemical information on heterogeneous photocatalysis of sulfur aromatic compounds accumulated in the last 20-30 years. Specifically, the following topics are covered: physicochemical properties of sulfur aromatic compounds, major classes of heterogeneous photocatalysts, mechanisms and reactive intermediates of photocatalytic reactions of sulfur aromatic compounds, and the selectivity of these reactions. Quantum chemical calculations of properties and structures of sulfur aromatic compounds, their reactive intermediates, and the structure of adsorption complexes formed on the surface of the photocatalysts are also discussed.
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12
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Barbieriková Z, Bella M, Kučerák J, Milata V, Jantová S, Dvoranová D, Veselá M, Staško A, Brezová V. Photoinduced Superoxide Radical Anion and Singlet Oxygen Generation in the Presence of Novel Selenadiazoloquinolones (An EPR Study). Photochem Photobiol 2010; 87:32-44. [DOI: 10.1111/j.1751-1097.2010.00832.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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13
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Staško A, Brezová V, Zalibera M, Biskupič S, Ondriaš K. Electron transfer: A primary step in the reactions of sodium hydrosulphide, an H2S/HS−donor. Free Radic Res 2009; 43:581-93. [DOI: 10.1080/10715760902977416] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Andrej Staško
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37, Bratislava, Slovak Republic
| | - Vlasta Brezová
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37, Bratislava, Slovak Republic
| | - Michal Zalibera
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37, Bratislava, Slovak Republic
| | - Stanislav Biskupič
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37, Bratislava, Slovak Republic
| | - Karol Ondriaš
- Institute of Molecular Physiology and Genetics, Centre of Excellence for Cardiovascular Research, Slovak Academy of Sciences, Vlárska 5, SK-833 34, Bratislava, Slovak Republic
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Brezová V, Dvoranová D, Staško A. Characterization of titanium dioxide photoactivity following the formation of radicals by EPR spectroscopy. RESEARCH ON CHEMICAL INTERMEDIATES 2007. [DOI: 10.1163/156856707779238630] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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15
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Dvoranová D, Brezová V, Valko M, Staško A. Photoinduced transformation of camptothecin in the presence of iron(III) ions. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.06.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Brezová V, Gabcová S, Dvoranová D, Stasko A. Reactive oxygen species produced upon photoexcitation of sunscreens containing titanium dioxide (an EPR study). JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2005; 79:121-34. [PMID: 15878117 DOI: 10.1016/j.jphotobiol.2004.12.006] [Citation(s) in RCA: 150] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2004] [Revised: 12/30/2004] [Accepted: 12/30/2004] [Indexed: 11/16/2022]
Abstract
Commercial sunscreen products containing titanium dioxide were irradiated with lambda>300 nm and the formation of oxygen- (.OH, O2.-/.OOH) and carbon-centered radicals was monitored by EPR spectroscopy and spin trapping technique using 5,5-dimethyl-1-pyrroline N-oxide, alpha-phenyl-N-tert-butylnitrone (PBN), alpha-(4-pyridyl-1-oxide)-N-tert-butylnitrone as spin traps, and free nitroxide radical 4-hydroxy-2,2,6,6-tetramethylpiperidine N-oxyl. The photoinduced production of singlet oxygen was shown by 4-hydroxy-2,2,6,6-piperidine. The generation of reactive oxygen radical species upon irradiation of sunscreens significantly depends on their composition, as the additives present (antioxidants, radical-scavengers, solvents) can transform the reactive radicals formed to less harmful products. The continuous in situ irradiation of titanium dioxide powder, recommended for cosmetic application, investigated in different solvents (water, dimethyl sulfoxide, isopropyl myristate) resulted in the generation of oxygen-centered reactive radical species (superoxide anion radical, hydroxyl and alkoxyl radicals).
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Affiliation(s)
- Vlasta Brezová
- Department of Physical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-812 37 Bratislava, Slovak Republic.
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17
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Konovalova TA, Lawrence J, Kispert LD. Generation of superoxide anion and most likely singlet oxygen in irradiated TiO2 nanoparticles modified by carotenoids. J Photochem Photobiol A Chem 2004. [DOI: 10.1016/s1010-6030(03)00313-7] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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18
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Brezova V, Valko M, Breza M, Morris H, Telser J, Dvoranova D, Kaiserova K, Varecka L, Mazur M, Leibfritz D. Role of Radicals and Singlet Oxygen in Photoactivated DNA Cleavage by the Anticancer Drug Camptothecin: An Electron Paramagnetic Resonance Study. J Phys Chem B 2003. [DOI: 10.1021/jp027743m] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- V. Brezova
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom, Faculty of Chemical and Food Technology, Slovak Technical University, SK-812 37 Bratislava, Slovakia, Department of Organic Chemistry 2/NW2, Bremen University, D-283 59 Bremen, Germany, and Chemistry Program, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605
| | - M. Valko
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom, Faculty of Chemical and Food Technology, Slovak Technical University, SK-812 37 Bratislava, Slovakia, Department of Organic Chemistry 2/NW2, Bremen University, D-283 59 Bremen, Germany, and Chemistry Program, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605
| | - M. Breza
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom, Faculty of Chemical and Food Technology, Slovak Technical University, SK-812 37 Bratislava, Slovakia, Department of Organic Chemistry 2/NW2, Bremen University, D-283 59 Bremen, Germany, and Chemistry Program, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605
| | - H. Morris
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom, Faculty of Chemical and Food Technology, Slovak Technical University, SK-812 37 Bratislava, Slovakia, Department of Organic Chemistry 2/NW2, Bremen University, D-283 59 Bremen, Germany, and Chemistry Program, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605
| | - J. Telser
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom, Faculty of Chemical and Food Technology, Slovak Technical University, SK-812 37 Bratislava, Slovakia, Department of Organic Chemistry 2/NW2, Bremen University, D-283 59 Bremen, Germany, and Chemistry Program, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605
| | - D. Dvoranova
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom, Faculty of Chemical and Food Technology, Slovak Technical University, SK-812 37 Bratislava, Slovakia, Department of Organic Chemistry 2/NW2, Bremen University, D-283 59 Bremen, Germany, and Chemistry Program, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605
| | - K. Kaiserova
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom, Faculty of Chemical and Food Technology, Slovak Technical University, SK-812 37 Bratislava, Slovakia, Department of Organic Chemistry 2/NW2, Bremen University, D-283 59 Bremen, Germany, and Chemistry Program, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605
| | - L. Varecka
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom, Faculty of Chemical and Food Technology, Slovak Technical University, SK-812 37 Bratislava, Slovakia, Department of Organic Chemistry 2/NW2, Bremen University, D-283 59 Bremen, Germany, and Chemistry Program, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605
| | - M. Mazur
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom, Faculty of Chemical and Food Technology, Slovak Technical University, SK-812 37 Bratislava, Slovakia, Department of Organic Chemistry 2/NW2, Bremen University, D-283 59 Bremen, Germany, and Chemistry Program, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605
| | - D. Leibfritz
- School of Pharmacy and Chemistry, Liverpool John Moores University, Liverpool L3 3AF, United Kingdom, Faculty of Chemical and Food Technology, Slovak Technical University, SK-812 37 Bratislava, Slovakia, Department of Organic Chemistry 2/NW2, Bremen University, D-283 59 Bremen, Germany, and Chemistry Program, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605
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Yamamoto Y, Imai N, Mashima R, Konaka R, Inoue M, Dunlap WC. Singlet oxygen from irradiated titanium dioxide and zinc oxide. Methods Enzymol 2000; 319:29-37. [PMID: 10907496 DOI: 10.1016/s0076-6879(00)19005-6] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Affiliation(s)
- Y Yamamoto
- Research Center for Advanced Science and Technology, University of Tokyo, Japan
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20
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Liu G, Zhao J, Hidaka H. ESR spin-trapping detection of radical intermediates in the TiO2-assisted photo-oxidation of sulforhodamine B under visible irradiation. J Photochem Photobiol A Chem 2000. [DOI: 10.1016/s1010-6030(00)00227-6] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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21
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Konaka R, Kasahara E, Dunlap WC, Yamamoto Y, Chien KC, Inoue M. Irradiation of titanium dioxide generates both singlet oxygen and superoxide anion. Free Radic Biol Med 1999; 27:294-300. [PMID: 10468201 DOI: 10.1016/s0891-5849(99)00050-7] [Citation(s) in RCA: 171] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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 1O2-sensitive trapping agent. Under identical conditions, the superoxide ion was also detected by spin trapping agent 5,5-dimethyl-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-piperidinyloxy (4-oxo-TEMPO), a reaction product of 4-oxo-TMP and 1O2. The detailed mechanism for the generation of 1O2 and superoxide ion by irradiated TiO2 and reactions between these species and DMPO are discussed.
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Affiliation(s)
- R Konaka
- Department of Biochemistry, Osaka City University Medical School, Abeno, Osaka, Japan
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Miyoshi H, Kourai H, Maeda T, Yoshino T. Role of Cl− adsorbed on silver-loaded zirconium phosphate for the photooxidation of OH− to OH·. J Photochem Photobiol A Chem 1998. [DOI: 10.1016/s1010-6030(98)00198-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Martino DM, van Willigen H, Spitler MT. FT-EPR Study of Photoinduced Electron Transfer at the Surface of TiO2 Nanoparticles. J Phys Chem B 1997. [DOI: 10.1021/jp971682o] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Débora M. Martino
- Department of Chemistry, University of Massachusetts at Boston, Boston, Massachusetts 02125
| | - Hans van Willigen
- Department of Chemistry, University of Massachusetts at Boston, Boston, Massachusetts 02125
| | - Mark T. Spitler
- Department of Chemistry, University of Massachusetts at Boston, Boston, Massachusetts 02125
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Nosaka Y, Fukuyama H. Application of Chemiluminescent Probe to the Characterization of TiO2Photocatalysts in Aqueous Suspension. CHEM LETT 1997. [DOI: 10.1246/cl.1997.383] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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