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Initial Molecular Geometry of Radiation-Induced Reactive Species in Water
https://repo.qst.go.jp/records/83826
https://repo.qst.go.jp/records/838261bab7ffe-9195-49db-ad0a-80e6a55cc640
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2021-09-16 | |||||
| タイトル | ||||||
| タイトル | Initial Molecular Geometry of Radiation-Induced Reactive Species in Water | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Matsumoto, Ken-ichiro
× Matsumoto, Ken-ichiro× Megumi, Ueno× Yoshimi, Shoji× Ikuo, Nakanishi× Kenichiro, Matsumoto× Megumi, Ueno× Yoshimi, Shoji× Ikuo, Nakanishi |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Local concentration of hydroxyl radical (•OH) and hydrogen radicals (•H) generated in water during X-ray irradiation to aqueous reaction mixtures was quantified by an electron paramagnetic resonance (EPR) spin-trapping technique using 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as a spin-trapping agent. During water radiolysis process, the •OH and •H could be generated. The G-values reported for •OH and •H are 0.28 and 0.06, respectively. It was discussed what could make this difference of yields of •OH and •H. A lower (0.13 mM‒2.3 M) concentration series and a higher (1.7‒4.8 M) concentration series of DMPO water solutions plus neat DMPO liquid (8.8 M as DMPO) were irradiated with 32 Gy of X-rays. Signal intensities of DMPO-OH and DMPO-H caused in the sample were measured by X-band EPR spectrometer. The decay of DMPO-OH and DMPO-H during and after irradiation was corrected and the net yield was observed. The profiles observed by plotting concentrations of DMPO-OH and DMPO-H against the DMPO linear density (reciprocal of the intermolecular distance of DMPO) were analyzed. When X-ray was irradiated to DMPO aqueous solutions, DMPO-OH showed a 4-phase profile, however, DMPO-H showed a 2-phase profile. The inflection point made by 1st and 2nd phases indicates relatively sparse (mmol/L-level) generations; and the inflection point formed by 3rd and 4th phases indicates markedly dense (mol/L-level) generations of the target radicals. Both profiles observed for DMPO-OH and DMPO-H were almost overlapped except the DMPO-H lacked 3rd and 4th phases. The yields of the relatively sparse generations of both •OH and •H were estimated as 200 mmol/L/Gy. Total yields of •OH were 500 mmol/L/Gy or more, and 200 mmol/L/Gy for •H. Radiation induced •H generation is available only from sparse ionization. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | The Society for Redox Biology and Medicine's 28th Annual Conference (SfRBM 2021) | |||||
| 発表年月日 | ||||||
| 日付 | 2021-11-16 | |||||
| 日付タイプ | Issued | |||||
