Notable Effects of the Metal Salts on the Quenching Reaction of Singlet Oxygen by α-Tocopherol in Ethanol Solution
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- Mukai Kazuo
- Department of Chemistry, Faculty of Science, Ehime University
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- Nakamura Asuka
- Department of Chemistry, Faculty of Science, Ehime University
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- Nagaoka Shin-ichi
- Department of Chemistry, Faculty of Science, Ehime University
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- Ouchi Aya
- Department of Chemistry, Faculty of Science, Ehime University Quality Control Division, Osaka Delika Foods Co., Ltd.
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- Azuma Nagao
- Department of Chemistry, Faculty of Science, Ehime University
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Measurement of the quenching rate constant (kQ) of singlet oxygen (1O2) by α-tocopherol was performed in ethanol solution including four kinds of alkali and alkaline earth metal salts (NaClO4, Mg(ClO4)2, MgCl2, and CaCl2) by varying concentrations of metal salts. A remarkable effect of metal salts on the kQ value of α-tocopherol was observed. The 1O2-quenching rate constant (kQ) decreased notably with increasing concentrations of metal salts, and reached a constant value for each salt at high concentration of the salt. For example, the kQ value (9.48 × 107 M−1 s−1) obtained in the presence of 20 mM of Mg(ClO4)2 was 46% of that (2.06 × 108 M−1 s−1) in the absence of metal salt. The kQ value decreased in the order of no metal salt > NaClO4 > CaCl2 > MgCl2 ≈ Mg(ClO4)2 at the same concentration of the metal salts. The metal salts having a smaller ionic radius and a larger charge of the cation gave a smaller kQ value. Effects of anions were negligible. These metal cations coexist with α-tocopherol in foods and biological systems, suggesting that the metal cations may give a notable effect to the 1O2-quenching rate constant (kQ).
収録刊行物
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- Bulletin of the Chemical Society of Japan
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Bulletin of the Chemical Society of Japan 88 (10), 1503-1510, 2015
公益社団法人 日本化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204141362560
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- NII論文ID
- 130005102816
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- NII書誌ID
- AA00580132
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- ISSN
- 13480634
- 00092673
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- NDL書誌ID
- 026791385
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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