2,4,6-Triphenylpyridine N-oxide anion radical

1985 ◽  
Vol 21 (9) ◽  
pp. 1059-1059 ◽  
Author(s):  
K. K. Akopdzhanyan ◽  
A. A. Bumber ◽  
E. S. Klimov ◽  
O. Yu. Okhlobystin
Keyword(s):  
Anion Radical ◽  
Oxide Anion Radical

scholarly journals Phenolic Compounds from Eucalyptus Gomphocephala with Potential Cytotoxic and Antioxidant Activities

2010 ◽  
Vol 5 (10) ◽  
pp. 1934578X1000501 ◽  
Author(s):  
Eman Al-Sayed ◽  
Olli Martiskainen ◽  
Małtgorzata Bobrowska-Hägerstrand ◽  
Jari Sinkkonen ◽  
Kid Törnquist ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Anion Radical ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Antioxidant Effect ◽  
Aqueous Acetone ◽  
Acetone Extract ◽  
Hela Cell Line ◽  
Oxide Anion Radical ◽  
Eucalyptus Gomphocephala

Two new phenolic compounds, 2,4,6-trihydroxy-5-methyl-acetophenone 2- O-β-D-glucopyranoside (3), and benzyl alcohol 7- O-(3’,4’,6’-tri- O-galloyl)-β-D-glucopyranoside (8), together with eight known phenolic compounds, were isolated from the 70% aqueous acetone extract of Eucalyptus gomphocephala DC. (Myrtaceae). The isolated compounds were elucidated based on their 1H, 13C, DQF-COSY, selective 1D-TOCSY, HSQC, and HMBC NMR spectroscopic; and ESIMS data. The antioxidant effect of the phenolic compounds was tested using 1,1-diphenyl-2-picrylhydrazyl (DPPH.), hydroxyl radical and super oxide anion radical scavenging assays. The cytotoxicity of the isolated compounds was evaluated using HeLa cell line.

Swift and efficient sono-hydrolysis of nitriles to carboxylic acids under basic condition: Role of the oxide anion radical in the hydrolysis mechanism

2011 ◽  
Vol 18 (1) ◽  
pp. 28-31 ◽  
Author(s):  
Pascal Lignier ◽  
Julien Estager ◽  
Nathalie Kardos ◽  
Lydie Gravouil ◽  
Julien Gazza ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Anion Radical ◽  
Hydrolysis Mechanism ◽  
Oxide Anion Radical ◽  
Hydrolysis Of

Scavenging of Reactive Oxygen Species by a Urinary Preparation

2000 ◽  
Vol 28 (02) ◽  
pp. 251-258 ◽  
Author(s):  
Wen-Chuan Lin ◽  
Tung-Yuan Lai ◽  
Yuen-Wern Wu
Keyword(s):  
Reactive Oxygen Species ◽  
Lipid Peroxidation ◽  
Anion Radical ◽  
Ex Vivo ◽  
Antioxidant Properties ◽  
Order Rate Constant ◽  
Inhibitory Effect ◽  
Oxygen Species ◽  
Oxide Anion Radical

In the present paper, the antioxidant properties of a preparation of human urine (PHU) were evaluated by studying the ability of this drug to react with relevant biological oxidants such as super-oxide anion radical ( O 2·-) and hydroxyl radical ( OH ·). In addition, its effect on lipid peroxidation was investigated in vitro and ex vivo. PHU is not a good scavenger of O2·-. However, it react rapidly with OH· radicals with a second-order rate constant of 2.8 × 109/M/sec. The studies on rat brain homogenates showed that PHU had an inhibitory effect, which was dependent on its concentration and the magnitude of lipid peroxidation. Ex vivo studies also showed that oral administration of PHU increased the antioxidant capacity of plasma from rats. The ability of PHU to scavenge free radicals suggests that this drug may be potentially useful in counteracting free radical-mediated diseases.

scholarly journals Kinetics and Mechanisms of the Voltammetric Reduction of Heteroaromatic N-Oxides in Aprotic Media. The Protonation of 1,4-Diphenylphthalazine N-Oxide Anion Radical by Diethyl Malonate in N,N-Dimethylformamide.

1985 ◽  
Vol 39b ◽  
pp. 603-605 ◽  
Author(s):  
Mogens L. Andersen ◽  
Ole Hammerich ◽  
Knut Maartmann-Moe ◽  
Søren Brøgger Christensen ◽  
Gotfryd Kupryszewski ◽  
...  
Keyword(s):  
Anion Radical ◽  
Diethyl Malonate ◽  
Oxide Anion Radical

Superoxide Anion Radical: Generation and Detection in Cellular and Non-Cellular Systems

2015 ◽  
Vol 22 (37) ◽  
pp. 4234-4256 ◽  
Author(s):  
Renan Chiste ◽  
Marisa Freitas ◽  
Adriana Mercadante ◽  
Eduarda Fernandes
Keyword(s):  
Superoxide Anion ◽  
Anion Radical ◽  
Cellular Systems ◽  
Superoxide Anion Radical ◽  
Radical Generation

Electrochemical reduction of para-substituted 2-acyl-5-phenylfuranes in dimethylformamide

1981 ◽  
Vol 46 (2) ◽  
pp. 498-502 ◽  
Author(s):  
Jozef Černák ◽  
František Tomanovič ◽  
Andrej Staško ◽  
Anna Fedosyevna Oleinikova ◽  
Jaroslav Kováč
Keyword(s):  
Electrochemical Reduction ◽  
Unpaired Electron ◽  
Anion Radical ◽  
Electron Wave ◽  
Epr Method ◽  
Electron Center ◽  
Nitrogen Nucleus ◽  
Nitro Derivatives ◽  
Stable Anion ◽  
Derivatives Of

para Substituted chloro, bromo, and nitro derivatives of 2-acyl-5-phenylfurane are reduced polarographically in a one-electron wave to the corresponding anion radicals, which were studied by the EPR method. The reduction of nitro derivatives, studied by the Kalousek switch, is reversible and leads to a stable anion radical with an unpaired electron center on the nitrogen nucleus; the reduction of the halogen derivatives is only partly reversible and leads to unstable ketyl radicals. The bromo derivatives give polarographic maxima typical for concurrent reactions.

Stable alkaline earth metal-ammonia-anion radical complexes and their thermodynamic stabilities

1985 ◽  
Vol 89 (1) ◽  
pp. 175-177 ◽  
Author(s):  
Gerald R. Stevenson ◽  
Laurel E. Schock ◽  
Rosario Concepcion ◽  
Richard A. Peterson
Keyword(s):  
Anion Radical ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal

Anion radical of bacteriochlorophyll

1973 ◽  
Vol 95 (8) ◽  
pp. 2739-2741 ◽  
Author(s):  
J. Fajer ◽  
D. C. Borg ◽  
A. Forman ◽  
D. Dolphin ◽  
R. H. Felton
Keyword(s):  
Anion Radical

scholarly journals A Study of Catechin Photostability Using Photolytic Processing

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 293
Author(s):  
Jeu-Ming P. Yuann ◽  
Shwu-Yuan Lee ◽  
Meei-Ju Yang ◽  
Shiuh-Tsuen Huang ◽  
Chien-Wei Cheng ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Alkaline Solutions ◽  
Light Illumination ◽  
Drug Resistant ◽  
Alkaline Ph ◽  
Radical Species ◽  
Alkaline Conditions ◽  
Photolytic Reaction

Catechin exhibits numerous physiological characteristics. In this study, we determined the photosensitivity of catechin to various lights under alkaline conditions, and the mechanisms by which catechin generates free radical species and polymerizes via a photoreaction. In addition to this, the application of catechin photolysis was investigated. A solution of catechin is transparent, but turns yellowish under blue light illumination (BLI) in neutral or weak alkaline solutions. When catechin is subjected to BLI, a dimeric catechin (proanthocyanidin) and a superoxide anion radical (O2•−) are generated in a photolytic reaction. When ascorbic acid or gallic acid is added to catechin and the mixture is subjected to BLI at alkaline pH, fewer catechin dimers and less O2•− are produced, because both acids inhibit the photosensitive oxidation of catechin. When AlCl3 is added to catechin and the mixture is subjected to BLI at pH 8, a photolytic reaction is suppressed by AlCl3, and AlCl3 acts as a catalyst for the disconnection of proanthocyanidin during photolysis. Under alkaline conditions, catechin generates O2•− via photosensitive oxidation, which suppresses the growth of Acinetobacter baumannii (A. baumannii) by at least 4 logs, and deactivates its multi-drug-resistant strain. This study shows that catechin photolysis is a process of oxidation, and that it can be safely applied as a tool for environmental applications.

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