Antioxidant stoichiometry and the oxidative fate of vitamin E in peroxyl radical scavenging reactions

Lipids ◽  
1995 ◽  
Vol 30 (9) ◽  
pp. 789-793 ◽  
Author(s):  
Daniel C. Liebler ◽  
Jeanne A. Burr
Keyword(s):  
Vitamin E ◽  
Peroxyl Radical ◽  
Radical Scavenging

On the path from ubiquinone to ubiquinol: chain breaking lipid peroxyl radical scavenging or vitamin E radical recycling?

1990 ◽  
Vol 9 ◽  
pp. 28
Author(s):  
Valerian Kagan ◽  
Elena Serbinova ◽  
Derick Han ◽  
Anna Shvedova ◽  
Lester Packer
Keyword(s):  
Vitamin E ◽  
Peroxyl Radical ◽  
Radical Scavenging ◽  
Chain Breaking

Anti-hemolytic and Peroxyl Radical Scavenging Activity of Organoselenium Compounds: An In Vitro Study

2010 ◽  
Vol 140 (2) ◽  
pp. 127-138 ◽  
Author(s):  
B. Santhosh Kumar ◽  
Amit Kunwar ◽  
Beena G. Singh ◽  
Adeel Ahmad ◽  
K. Indira Priyadarsini
Keyword(s):  
Peroxyl Radical ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
In Vitro Study ◽  
Vitro Study ◽  
Scavenging Activity ◽  
Organoselenium Compounds

Evidence of Trolox and some gallates as synergistic protectors of erythrocytes against peroxyl radicals

1998 ◽  
Vol 76 (4) ◽  
pp. 661-664 ◽  
Author(s):  
J Wu ◽  
H Sugiyama ◽  
L -H Zeng ◽  
D Mickle ◽  
T -W Wu
Keyword(s):  
Antioxidant Activity ◽  
Vitamin E ◽  
Protective Effect ◽  
Propyl Gallate ◽  
Peroxyl Radical ◽  
Human Erythrocytes ◽  
Peroxyl Radicals ◽  
Methyl Ethyl ◽  
Radical Initiator ◽  
Individual Contributions

The peroxidation of human erythrocytes induced by peroxyl radical initiator and its inhibition by several gallate esters (e.g., propyl, methyl, ethyl) and Trolox (a more polar analogue of vitamin E) have been studied. The antioxidant activity was determined on erythrocytes against hemolysis generated by a thermal activator, 2,2prime-azobis-(2-amidinopropane)dihydrogenchloride. It was found that propyl gallate and its two analogues were more effective than Trolox in preventing cell lysis. However, the combination of gallate esters and Trolox produced a protective effect exceeding the arithmetic sum of their individual contributions. These perceived synergisms occur at more than one level of Trolox at a given level of a gallate ester.Key words: Trolox, gallates, synergism, peroxyl radicals.

Potent Free Radical Scavenging Activity of Propol Isolated from Brazilian Propolis

1997 ◽  
Vol 52 (11-12) ◽  
pp. 828-833 ◽  
Author(s):  
Purusotam Basnet ◽  
Tetsuya Matsuno ◽  
Richard Neidlein
Keyword(s):  
Free Radical ◽  
Vitamin E ◽  
Superoxide Anion ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Water Extract ◽  
Free Radical Scavenging ◽  
Free Radical Scavenging Activity ◽  
Scavenging Activity ◽  
Brazilian Propolis

Abstract We evaluated free radical scavenging activity of the water, methanol and chloroform ex­tracts of propolis in 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical and xanthine-xanthine oxidase (XOD) generated superoxide anion assay systems. The free radical scavenging activity guided fractionation and chemical analysis led to the isolation of a new compound, propol {3-[4-hydroxy-3-(3-oxo-but-1-enyl)-phenyl]-acrylic acid) from the water extract, which was more potent than most common antioxidants such as vitamin C and vitamin E (α-tocopherol) in these assay systems.

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