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Kojima T, Aihara H, Kodashima Y, Makishima H, Nakiri S, Takada S, Shimada H, Ukai M, Ozga C, Holzapfel X, Schmidt P, Küstner-Wetekam C, Otto H, Bloβ D, Knie A, Ehresmann A, Yokoya A, Fujii K, Fukuda Y, Saitoh Y. NOVEL ANALYTICAL STUDY FOR REACTION INTERMEDIATES IN THE PRIMARY RADIATION INTERACTION OF DNA USING A SYNCHROTRON RADIATION-INDUCED LUMINESCENCE SPECTROSCOPY. Radiat Prot Dosimetry 2019; 183:32-35. [PMID: 30753692 DOI: 10.1093/rpd/ncy239] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Indexed: 06/09/2023]
Abstract
To identify the precise molecular processes to induce DNA lesions, we attempt a novel spectroscopy of X-ray induced luminescence (XIL) using soft X-ray synchrotron radiation, which is a non-destructive analysis of the reaction intermediates in the elementary reaction pathway of damage induction and self-organized restoration. Using a liquid micro-jet technique to introduce aqueous samples in a vacuum chamber, we measure UV-visible luminescence from nucleotide solution as a function of the soft X-ray energy from the nitrogen to oxygen K-edge region. The XIL intensities for the nucleotide solutions are significantly enhanced in the soft X-ray region (410-530 eV) which is ascribed to the K-shell excitation/ionization of nitrogen atoms in the nucleobases. Furthermore, the XIL spectra do not show any signature of X-ray absorption near-edge structure (XANES) of the nucleobases. This is because the luminescence intensities collected from the integral area of the micro-jet only reflect the quantum yield of luminescence of the absorbed X-ray into UV-visible light irrespective of the absorption cross sections, i.e. of XANES. Thus the present result is the first evidence of luminescence as a result of X-ray absorption of aqueous nucleotides.
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Affiliation(s)
- T Kojima
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - H Aihara
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - Y Kodashima
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - H Makishima
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - S Nakiri
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - S Takada
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - H Shimada
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - M Ukai
- Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan
| | - C Ozga
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - X Holzapfel
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - Ph Schmidt
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - C Küstner-Wetekam
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - H Otto
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - D Bloβ
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - A Knie
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - A Ehresmann
- Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich-Plett Str. 40, Kassel, Germany
| | - A Yokoya
- Center of Quantum beam Science, National Institute for Quantum and Radiological Science (QST), Naka-gun, Ibaraki, Japan
| | - K Fujii
- Center of Quantum beam Science, National Institute for Quantum and Radiological Science (QST), Naka-gun, Ibaraki, Japan
| | - Y Fukuda
- Synchrotron Radiation Research Center, Japan Atomic Energy Agency (JAEA), Sayo-gun, Hyougo, Japan
| | - Y Saitoh
- Synchrotron Radiation Research Center, Japan Atomic Energy Agency (JAEA), Sayo-gun, Hyougo, Japan
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