Localized hydroxyl radical generation at mmol/L and mol/L levels in water by photon irradiation

• Ogawa Yukihiro

  Graduate School of Advanced Integration Science, Chiba University Quantitative RedOx Sensing Team, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology

• Sekine-Suzuki Emiko

  Quantitative RedOx Sensing Team, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology

• Ueno Megumi

  Quantitative RedOx Sensing Team, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology

• Nakanishi Ikuo

  Quantitative RedOx Sensing Team, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology

• Matsumoto Ken-ichiro

  Quantitative RedOx Sensing Team, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology Graduate School of Science, Chiba University

抄録

The generation of localized hydroxyl radical (^•OH) in aqueous samples by low linear energy transfer irradiation was investigated. Several concentrations of 5,5-dimethyl-1-pyrroline-N-oxid solution (from 0.5 to 1,680 mmol/L) were prepared and irradiated with an identical dose of X-ray or γ-ray. The density of ^•OH generation in aqueous solution was evaluated by the electron paramagnetic resonance spin-trapping technique using 5,5-dimethyl-1-pyrroline-N-oxid as an electron paramagnetic resonance spin-trapping agent. The relationship between the molecular density of 5,5-dimethyl-1-pyrroline-N-oxid in the samples and the concentration of 5,5-dimethyl-1-pyrroline-N-oxid-OH generated in the irradiated samples was analyzed. Two different characteristic linear trends were observed in the 5,5-dimethyl-1-pyrroline-N-oxid-OH/5,5-dimethyl-1-pyrroline-N-oxid plots, which suggested ^•OH generation in two fashions, i.e., mmol/L- and mol/L-level local concentrations. The dose, dose rate, and/or the energy of photon irradiation did not affect the shapes of the 5,5-dimethyl-1-pyrroline-N-oxid-OH/5,5-dimethyl-1-pyrroline-N-oxid plots. Moreover, the addition of 5 mmol/L caffeine could cancel the contribution of mmol/L-level ^•OH generation, leaving a trace of mol/L-level ^•OH generation. Thus, the localized mmol/L- and mol/L-level generations of ^•OH, which were independent of experimental parameters such as dose, dose rate, and/or the energy of photon of low linear energy transfer radiation, were established.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　Ｃｌｉｎｉｃａｌ　Ｂｉｏｃｈｅｍｉｓｔｒｙ　ａｎｄ　Ｎｕｔｒｉｔｉｏｎ

  Ｊｏｕｒｎａｌ　ｏｆ　Ｃｌｉｎｉｃａｌ　Ｂｉｏｃｈｅｍｉｓｔｒｙ　ａｎｄ　Ｎｕｔｒｉｔｉｏｎ 63 (2), 97-101, 2018

  一般社団法人　日本酸化ストレス学会

キーワード

• reactive oxygen species
• X-ray
• γ-ray
• electron paramagnetic resonance spin-trapping technique
• molecular density

詳細情報

• CRID: 1390845712995661056
• NII論文ID: 130007479957
• DOI: 10.3164/jcbn.18-15
• ISSN: 18805086
• ISSN: 09120009
• Web Site: https://www.jstage.jst.go.jp/article/jcbn/63/2/63_18-15/_pdf
• Web Site: https://search.jamas.or.jp/link/ui/2019146361
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可