Free radicals in γ-irradiated disodium succinate. Part 2. Triclinic crystals

1970 ◽  
Vol 48 (18) ◽  
pp. 2809-2813 ◽  
Author(s):  
M. Fujimoto ◽  
W. A. Seddon
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Room Temperature ◽  
Stable Conformation ◽  
Spin Resonance ◽  
Radiation Processes ◽  
Disodium Succinate

Electron spin resonance (e.s.r.) spectra and radiation processes in γ-irradiated triclinic crystals of disodium succinate are more complex than those observed in monoclinic crystals. At 77°K, three species coexist, −O2CCH2CH2ĊO22− (1), a distorted conformation of the radical −O2C(ĊHCH2)*CO2−(2), and an unidentified radical X. On warming to room temperature, 1 and X disappear, while 2 changes to a more stable conformation −O2CĊHCH2CO2− (3). In addition the species CO2− (4), and −O2CĊHCH3 (5) are produced. On further warming to 40 °C, species 4 disappears while at the same time species 3 increases in intensity. Radical 5 remains unaffected. Possible mechanism and comparisons with monoclinic crystals are discussed.

Free radicals in γ-irradiated disodium succinate. Part 1. Monoclinic crystals

1970 ◽  
Vol 48 (18) ◽  
pp. 2804-2808 ◽  
Author(s):  
H. M. Vyas ◽  
J. Janecka ◽  
M. Fujimoto
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Succinic Acid ◽  
Electron Spin ◽  
Room Temperature ◽  
Γ Irradiation ◽  
Stable Conformation ◽  
Spin Resonance ◽  
Radiation Processes ◽  
Disodium Succinate

Crystals of disodium succinate have two distinct modifications, monoclinic and triclinic. These were recognized by electron spin resonance (e.s.r.) studies of. the free radicals produced by γ-irradiation. In the monoclinic crystals, e.s.r. spectra and radiation processes appear similar to those observed in γ- (or x-) irradiated succinic acid. The situation in triclinic crystals is more complex (see Part 2). In monoclinic crystals irradiated at 77 °K, two types of radical coexist. They were identified as −O2CCH2CH2ĊO22−, 1, together with a distorted conformation of the radical −O2C(ĊHCH2)*CO2−, 2. On warming to room temperature the former species disappears while the latter changes irreversibly to a stable conformation −O2CĊHCH2CO2−, 3.

scholarly journals Force detection of high-frequency electron spin resonance near room temperature using high-power millimeter-wave source gyrotron

2021 ◽  
Vol 118 (2) ◽  
pp. 022407
Author(s):  
Hideyuki Takahashi ◽  
Yuya Ishikawa ◽  
Tsubasa Okamoto ◽  
Daiki Hachiya ◽  
Kazuki Dono ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Millimeter Wave ◽  
Electron Spin ◽  
High Power ◽  
High Frequency ◽  
Room Temperature ◽  
Force Detection ◽  
Wave Source ◽  
Spin Resonance ◽  
Millimeter Wave Source

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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