Real-time spin trapping of hydroxyl free radical in the ischemic and reperfused myocardium by continous-flow ESR spectroscopy

1990 ◽  
Vol 22 ◽  
pp. S16
Keyword(s):  
Free Radical ◽  
Real Time ◽  
Esr Spectroscopy ◽  
Spin Trapping ◽  
Hydroxyl Free Radical ◽  
Continous Flow ◽  
Reperfused Myocardium

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.

Note: A Comparative Study on the in Vitro Antiradical Activity and Hydroxyl Free Radical Scavenging Activity in Aged Red Wines

2003 ◽  
Vol 9 (6) ◽  
pp. 383-387 ◽  
Author(s):  
P. Kefalas ◽  
S. Kallithraka ◽  
I. Parejo ◽  
D. P. Makris
Keyword(s):  
Free Radical ◽  
Antiradical Activity ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Free Radical Scavenging Activity ◽  
Scavenging Activity ◽  
Red Wines ◽  
Hydroxyl Free Radical ◽  
Important Relationship

The antiradical and hydroxyl free radical scavenging activities were estimated in twenty-five, aged red wines from different areas in Greece. The antiradical activity (AAR) was determined by means of the wellknown DPPH• method, and its values ranged from 24.7 to 125.1. A novel, chemiluminescence-based, highly sensitive assay was applied for determination of the hydroxyl free radical scavenging activity (SAHFR), which varied from 1.62 to 12.22 mM quercetin equivalents. The values from the two assays correlated very well (r2 =0.8542, P<0.001), which confirmed an important relationship between SAHFR and AAR. This tendency in aged red wines, which may be significant in evaluating the antioxidant behaviour of red wine polyphenols, is discussed on the basis of previous research and relevant data.

Hydroxyl free radical reactivity toward aqueous chlorinated phenols

2005 ◽  
Vol 39 (5) ◽  
pp. 865-869 ◽  
Author(s):  
Julio A. Zimbron ◽  
Kenneth F. Reardon
Keyword(s):  
Free Radical ◽  
Chlorinated Phenols ◽  
Radical Reactivity ◽  
Hydroxyl Free Radical
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