Superoxide anion radical generation in the NaOH/H2O2/Fe(III) system: a spin trapping ESR study
文献类型：期刊论文
| 作者 | Nie, Z; Tian, Q; Liu, YP; Liu, Y |
| 刊名 | MAGNETIC RESONANCE IN CHEMISTRY
 |
| 出版日期 | 2006 |
| 卷号 | 44期号:1页码:38-44 |
| 关键词 | Esr Spin Trapping Superoxide Hydrogen Peroxide Hydroxyl Radical Reaction Mechanism Hydrolysis Ferric Oxide Heterogeneous Surface Catalysis Free Radicals |
| ISSN号 | 0749-1581 |
| DOI | 10.1002/mrc.1730 |
| 英文摘要 | Formation of free radical intermediates in a NaOH/H2O2/Fe(III) system has been studied by ESR spectroscopy in the presence of the spin trap 5,5-dimethy-1-pyrroline N-oxide (DMPO). DMPO/O-2 circle(-) and DMPO/(OH)-O-circle signals were simultaneously detected in this system, but only the DMPO/(OH)-O-circle signal could be observed in the absence of Fe(III). Effects of pH values and Fe(III) concentrations on the ESR signal intensities were investigated in detail. Formation of DMPO/O-2 circle(-) adduct was inhibited by the addition of superoxide dismutase (SOD), catalase or nitro blue tetrazolium (NBT), and by chelating the Fe(III) with some chelators, including ethylenediaminetetraacetic acid (EDTA), diethylenetriarninepentaacetic acid (DTPA), and desferrioxamine (DFO). Deoxygenation from the NaOH/H2O2/Fe(III) mixture had a slight effect on the formation of DMPO/O-2 circle(-). DMPO/O-2 circle(-) signal was also detected from the NaOH/H2O2/Fe(II) mixture, but it can be totally suppressed under anaerobic conditions. Considering the hydrolysis of Fe(III) into polymerization iron species with oxide phases in the alkaline medium, Fe2O3 was directly suspended into a mixture of NaOH/H2O2 for comparison. Fortunately, the presence of Fe2O3 suspension was found to be of benefit to the production of DMPO/O-2 circle(-). Influence of aging time of hydrolytic iron species on the superoxide anion radical generation was also studied. These results suggest that the generation of O-2-from the NaOH/H2O2/Fe(III) system was probably caused by the heterogeneous surface catalysis initiated by hydrolytic iron species. Copyright (c) 2005 John Wiley & Sons, Ltd. |
| 语种 | 英语 |
| WOS记录号 | WOS:000234603900008 |
| 出版者 | JOHN WILEY & SONS LTD |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/58603]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Liu, Y |
| 作者单位 | Chinese Acad Sci, Inst Chem, Ctr Mol Sci, State Key Lab Struct Chem Unstable & Stabel Speci, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Nie, Z,Tian, Q,Liu, YP,et al. Superoxide anion radical generation in the NaOH/H2O2/Fe(III) system: a spin trapping ESR study[J]. MAGNETIC RESONANCE IN CHEMISTRY,2006,44(1):38-44. |
| APA | Nie, Z,Tian, Q,Liu, YP,&Liu, Y.(2006).Superoxide anion radical generation in the NaOH/H2O2/Fe(III) system: a spin trapping ESR study.MAGNETIC RESONANCE IN CHEMISTRY,44(1),38-44. |
| MLA | Nie, Z,et al."Superoxide anion radical generation in the NaOH/H2O2/Fe(III) system: a spin trapping ESR study".MAGNETIC RESONANCE IN CHEMISTRY 44.1(2006):38-44. |
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来源：化学研究所
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