Dmpo Spin Trapping in the Presence of Fe Ion |
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| Authors: | Keisuke Makino Takuya Hagiwara Hiromasa Imaishi Masatoshi Nishi Satoshi Fujii Hiroaki Ohya Akira Murakami |
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| Affiliation: | a Department of Polymer Science and Engineering, Faculty of Textile Science, Kyoto Institute of Technology, Kyoto, Japanb Department of Pharmaceutical Science, Setsunan University, Osaka, Japanc Department of Chemistry, Faculty of Science, Kyoto University, Kyoto, Japan |
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| Abstract: | Aminoxyl radical formation from DMPO in the presence of Fe ion was studied to clarify the ambiguous ESR signals obtained by spin trapping with DMPO. It was found that when DMPO was used in a Fenton system, a Fe-DMPO complex was formed immediately. This complex was subsequently attacked by oxidative species originating from H2O2 and thus oxidative degradation of DMPO was induced in the Fenton system. On the other hand, in the case of M, PO, the degradation was found to be very slow, indicating that the 3 position of DMPO was favorably attacked by the oxidative species. Some of the degradation products are probably aminoxyl radicals. This series of the degradation products are probably aminoxyl radicals. This series of reactions may compete with spin trapping and make it difficult to analyze ESR spectra obtained in the presence of Fe ion. |
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| Keywords: | Spin trapping 5.5-dimethyl-l-pyrroline-N-oxide Fenton system Fe complex of DMPO artifact ESR signals ESR |
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