Electron spin resonance kinetic studies of malonyl radical self-decay and oxidation reactions by cerium(IV) and bromate in acid aqueous media. The role of free radicals in the Belousov-Zhabotinskii oscillator

1985 ◽  
Vol 89 (9) ◽  
pp. 1572-1574 ◽  
Author(s):  
M. A. Brusa ◽  
L. J. Perissinotti ◽  
A. J. Colussi
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Aqueous Media ◽  
Kinetic Studies ◽  
Oxidation Reactions ◽  
Spin Resonance

Electron resonance of gaseous free radicals

1968 ◽  
Vol 302 (1470) ◽  
pp. 291-304 ◽  
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Gas Phase ◽  
Electron Spin ◽  
Structural Information ◽  
Kinetic Studies ◽  
Large Field ◽  
Resonance Spectroscopy ◽  
Electron Resonance ◽  
Spin Resonance

At this meeting we shall discuss the application of electron spin resonance to the study of short–lived free radical intermediates in chemical reactions. Many such studies have now been described, but they are almost entirely confined to reactions in the liquid phase. When my colleagues and I began working on this subject almost two years ago, only five short–lived free radicals in the gas phase had been detected by electron resonance methods. These were OH, SH, SeH, TeH (Radford 1960, 1964) and SO (Daniels & Dorain 1964, 1966); in addition a number of atoms had been detected, notably H, O, N, P, F, Cl, Br and I. Kinetic studies in which electron resonance is used to monitor the concentrations of H and O atoms have become quite numerous. However, from the viewpoint of a spectroscopist, a potentially very large field has remained essentially unexplored. In §2 of this paper the relation between gas phase electron resonance spectroscopy and other forms of microwave spectroscopy, including the electron spin resonance of free radicals in liquids and solids, is demonstrated. Our experimental methods are described (§3) and the results we have obtained for a number of different free radicals reviewed. The exact analysis of the spectra is often compli­cated, but the description in §§4, 5 and 6 is non-mathematical and indicates qualitatively the structural information which can be obtained from the spectra. Finally possible future areas of development are considered (§7).

scholarly journals Estimation of the Postmortem Duration of Mouse Tissue by Electron Spin Resonance Spectroscopy

2011 ◽  
Vol 2011 ◽  
pp. 1-11
Author(s):  
Shinobu Ito ◽  
Tomohisa Mori ◽  
Hideko Kanazawa ◽  
Toshiko Sawaguchi
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Spin Trap ◽  
Detection Sensitivity ◽  
Mouse Tissue ◽  
Spin Adduct ◽  
Simple Method ◽  
Oxidation Stress ◽  
Spin Resonance

Electron spin resonance (ESR) method is a simple method for detecting various free radicals simultaneously and directly. However, ESR spin trap method is unsuited to analyze weak ESR signals in organs because of water-induced dielectric loss (WIDL). To minimize WIDL occurring in biotissues and to improve detection sensitivity to free radicals in tissues, ESR cuvette was modified and used with 5,5-dimethtyl-1-pyrroline N-oxide (DMPO). The tissue samples were mouse brain, hart, lung, liver, kidney, pancreas, muscle, skin, and whole blood, where various ESR spin adduct signals including DMPO-ascorbyl radical (AsA∗), DMPO-superoxide anion radical (OOH), and DMPO-hydrogen radical (H) signal were detected. Postmortem changes in DMPO-AsA∗and DMPO-OOH were observed in various tissues of mouse. The signal peak of spin adduct was monitored until the 205th day postmortem. DMPO-AsA∗in liver (y=113.8–40.7 log (day),R1=-0.779,R2=0.6,P<.001) was found to linearly decrease with the logarithm of postmortem duration days. Therefore, DMPO-AsA∗signal may be suitable for detecting an oxidation stress tracer from tissue in comparison with other spin adduct signal on ESR spin trap method.

Flash-photolysis electron spin resonance in solution studies of free radicals

1984 ◽  
Vol 78 ◽  
pp. 257 ◽  
Author(s):  
Christopher D. Buckley ◽  
Andrew I. Grant ◽  
Keith A. McLauchlan ◽  
Andrew J. D. Ritchie
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Flash Photolysis ◽  
Solution Studies ◽  
Spin Resonance
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