Detection of Superoxide Ions from Photoexcited Semiconductors in Non-Aqueous Solvents Using the ESR Spin-Trapping Technique

1993 ◽  
Vol 66 (12) ◽  
pp. 3542-3547 ◽  
Author(s):  
Hiroyuki Noda ◽  
Kazuo Oikawa ◽  
Hiroaki Ohya-Nishiguchi ◽  
Hitoshi Kamada
Keyword(s):  
Spin Trapping ◽  
Esr Spin Trapping ◽  
Spin Trapping Technique

An electron spin resonance spin trapping investigation of azide oxidation on TiO2 powder suspensions

1988 ◽  
Vol 66 (1) ◽  
pp. 76-80 ◽  
Author(s):  
Andrea Maldotti ◽  
Rossano Amadelli ◽  
Vittorio Carassiti
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Spin Trapping ◽  
Tio2 Powder ◽  
Aqueous Alkaline Medium ◽  
Esr Spin Trapping ◽  
Spin Resonance ◽  
High Production ◽  
Resonance Spin ◽  
Spin Trapping Technique

The oxidation of azide has been studied on TiO2 powder suspensions in water, methanol, and mixtures of the two solvents. The esr spin trapping technique has been employed to provide evidence for the formation of azidyl radicals [Formula: see text]. The results show that an aqueous alkaline medium is necessary to obtain a high production of [Formula: see text] radicals. A mechanism is proposed whereby the oxidation of [Formula: see text] is mainly due to reaction with OH• radicals which are in turn generated upon capture of holes by OH− groups adsorbed on TiO2. Azidyl anions adsorb weakly on TiO2 and do not displace adsorbed OH− from the surface.

scholarly journals The Application of ESR Spin-Trapping Technique to the Evaluation of SOD-likeActivity of Biological Substances

1990 ◽  
Vol 63 (1) ◽  
pp. 187-191 ◽  
Author(s):  
Keiichi Mitsuta ◽  
Yukio Mizuta ◽  
Masahiro Kohno ◽  
Midori Hiramatsu ◽  
Akitane Mori
Keyword(s):  
Spin Trapping ◽  
Esr Spin Trapping ◽  
Spin Trapping Technique

Peroxyl Radical Scavenging Ability of Fifty Kinds of Chinese Medicines Determined by an ESR Spin-Trapping Technique

2012 ◽  
Vol 549 ◽  
pp. 327-330
Author(s):  
Fu Hai Wang ◽  
Cheng Hua Huang
Keyword(s):  
Peroxyl Radical ◽  
Radical Scavenging ◽  
Herbal Medicines ◽  
Spin Trapping ◽  
Chinese Medicines ◽  
Esr Spin Trapping ◽  
Spin Resonance ◽  
Radical Scavenging Ability ◽  
Thermolysis Reaction ◽  
Spin Trapping Technique

The peroxyl radical scavenging abilities of fifty Chinese herbal medicines were determined accurately by an electron spin resonance (ESR) spin-trapping technique using 5,5-dimethyl-1-pyrroline 1-oxide (DMPO) as a spin-trapping reagent. The peroxyl radical was generated by the thermolysis reaction of 2,2’-Azobis(isobutyronitrile) (AIBN) in the presence of the spin-tap DMPO and with or without sample. As a result of these studies, a strong scavenging ability of peroxyl radical was found in Chinese medicines for diseases of anti-aging and blood circulation.

scholarly journals Synthesis of Fluorescent Dansyl Derivatives of Methoxyamine and Diphenylhydrazine as Free Radical Precursors

2020 ◽  
Vol 21 (10) ◽  
pp. 3559
Author(s):  
Bianca Patrascu ◽  
Sorin Mocanu ◽  
Anca Coman ◽  
Augustin M. Madalan ◽  
Codruta Popescu ◽  
...  
Keyword(s):  
Free Radical ◽  
Esr Spectroscopy ◽  
Spin Trapping ◽  
X Ray ◽  
Esr Spin Trapping ◽  
Dansyl Derivatives ◽  
Methoxy Radical ◽  
Derivatives Of ◽  
Fluorescent Derivatives ◽  
Spin Trapping Technique

Starting from dansyl-chloride, in reaction with 1,1-diphenylhydrazine and methoxyamine, two new fluorescent derivatives 1 and 2 were obtained and characterized by NMR, IR, UV-Vis, HR-MS, and fluorescence spectroscopy. The single-crystal X-ray structure was obtained for compound 2. Both compounds generate free radicals by oxidation, as demonstrated by ESR spectroscopy. Compound 1 generates the corresponding hydrazyl-persistent free radical, evidenced directly by ESR spectroscopy, while compound 2 generates in the first instance the methoxyaminyl short-lived free radical, which decomposes rapidly with the formation of the methoxy radical, evidenced by the ESR spin-trapping technique. By oxidation of compounds 1 and 2, their fluorescence is quenched.

Ozone exposure generates free radicals in the blood samplesin vitro. Detection by the ESR spin-trapping technique

1998 ◽  
Vol 29 (2) ◽  
pp. 127-135 ◽  
Author(s):  
Ikuko Ueno ◽  
Mikio Hoshino ◽  
Toshiaki Miura ◽  
Nariko Shinriki
Keyword(s):  
Free Radicals ◽  
Spin Trapping ◽  
Ozone Exposure ◽  
Esr Spin Trapping ◽  
Spin Trapping Technique
Sign in / Sign up

Export Citation Format

Share Document