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Metal Ions with Lewis Acidity Catalyze the Disproportionation of the 2,2-Diphenyl-1-picrylhydrazyl Radical in an Aprotic Medium
https://repo.qst.go.jp/records/71432
https://repo.qst.go.jp/records/714325d5cb9aa-770a-490e-aad4-9d0b06fc905b
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2014-03-31 | |||||
| タイトル | ||||||
| タイトル | Metal Ions with Lewis Acidity Catalyze the Disproportionation of the 2,2-Diphenyl-1-picrylhydrazyl Radical in an Aprotic Medium | |||||
| 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 |
和氣, 司
× 和氣, 司× 中西, 郁夫× 大久保, 敬× 福住, 俊一× 小澤, 俊彦× 松本, 謙一郎× 鎌田, 正× 和氣 司× 中西 郁夫× 大久保 敬× 小澤 俊彦× 松本 謙一郎× 鎌田 正 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical, frequently used as a model of reactive oxygen species, is enough stable not to undergo self-reactions. On the other hand, we have reported that redox-inactive metal ions affect the DPPH radical-scavenging activity of antioxidants. These results imply that metal ions with Lewis acidity may affect the reactivity of DPPH radical itself. Therefore, in this study we investigated the effect of aluminum ion on the reactivity of DPPH radical. The effect of aluminum ion was evaluated using photometric titration. After 30 min reactions of various concentrations of aluminum ion with DPPH radical at 37 °C, the absorption band at 517 nm due to DPPH radical was decreased and the band at 380 nm due to DPPH cation was observed appeared in acetonitrile. This indicates that aluminum ion catalyzed the electron-transfer disproportionation of DPPH radical in acetonitrile. The plot of absorbance at 517 nm vs [aluminum ion] showed an inflection point. The scavenging activity (SA)-value was calculated as the ratio of the initial DPPH radical concentration to the aluminum ion concentration at the inflection point (Waki T, et al. Chem. Commun. 2013; 49: 9842-9844). The SA value of aluminum ion (3.71) was significantly higher than that of Trolox (2.44). Thus, the metal ions with a strong Lewis acidity themselves can act as free radical-scavengers. | |||||
| 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 | 17th Biennial Meeting of Society for Free Radical Research International (SFRRI 2014) | |||||
| 発表年月日 | ||||||
| 日付 | 2014-03-25 | |||||
| 日付タイプ | Issued | |||||
