New technology for post-combustion abatement of carbon dioxide via an in situ generated superoxide anion-radical

RSC Advances ◽  
2014 ◽  
Vol 4 (69) ◽  
pp. 36544-36552 ◽  
Author(s):  
Uri Stoin ◽  
Zach Barnea ◽  
Yoel Sasson
Keyword(s):  
Carbon Dioxide ◽  
Superoxide Anion ◽  
Anion Radical ◽  
New Technology ◽  
Superoxide Anion Radical ◽  
Nucleophilic Attack ◽  
Superoxide Anions

A novel chemistry for the efficient abatement of carbon dioxideviaswift nucleophilic attack by superoxide anions is disclosed.

scholarly journals Effect of extraction conditions of paprika oleoresins on their free radical scavenging and anticancer activity

2014 ◽  
Vol 12 (3) ◽  
pp. 377-385 ◽  
Author(s):  
Vesna Šaponjac ◽  
Dragana Četojević-Simin ◽  
Gordana Ćetković ◽  
Jasna Čanadanović-Brunet ◽  
Sonja Djilas ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Cell Line ◽  
Antiproliferative Activity ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Radical Scavenging ◽  
Superoxide Anion Radical ◽  
Food Ingredients ◽  
Supercritical Carbon

AbstractGround spice paprika was extracted with hexane, by conventional Soxhlet procedure (SX oleoresin), and with supercritical carbon dioxide at three different pressures — 20, 30 and 40 MPa (SF20, SF30 and SF40 oleoresins). The effect of extraction method and conditions on the colour intesity of paprika oleoresins, content of α-tocopherol, as well as antioxidant and antiproliferative activity was examined. Hexane showed highest selectivity for paprika pigments (886.02 ASTA), while α-tocopherol showed highest solubility (3846.9 mg kg−1) in supercritical carbon dioxide at 20 MPa. All paprika oleoresins exhibited good superoxide anion radical scavenging activity SF30 being the best superoxide anion radical scavenger. Cell growth activity was evaluated in vitro in human cell lines:cervix epitheloid carcinoma (HeLa), breast adenocarcinoma (MCF7) and colon adenocarcinoma (HT-29). The highest antiproliferative activity was exhibited by SX in MCF7 cell line (IC50=14.28 mg mL−1). Extract SF40 produced significant and selective antiproliferative action towards HeLa cell line. These results suggest that paprika oleoresins, due to high antiradical and tumor cell-inhibiting activity, can be regarded as functional food ingredients.

In situ Generation of Superoxide Anion Radical in Aqueous Medium under Ambient Conditions

ChemPhysChem ◽  
2013 ◽  
Vol 14 (18) ◽  
pp. 4158-4164 ◽  
Author(s):  
Uri Stoin ◽  
Alexander I. Shames ◽  
Itamar Malka ◽  
Ilana Bar ◽  
Yoel Sasson
Keyword(s):  
Aqueous Medium ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Superoxide Anion Radical ◽  
Ambient Conditions ◽  
In Situ Generation

scholarly journals ROS Accumulation and TTC Reduction in Growing Embryo of Crithmum maritimum L. Isolated from Water or Salt Imbibed Seeds

2011 ◽  
Vol 3 (2) ◽  
pp. 98-103 ◽  
Author(s):  
Abdallah ATIA ◽  
Chedly ABDELLY ◽  
Abderrazak SMAOUI
Keyword(s):  
Superoxide Anion ◽  
Anion Radical ◽  
Respiratory Activity ◽  
Superoxide Anion Radical ◽  
Distilled Water ◽  
Tetrazolium Chloride ◽  
Ros Accumulation ◽  
Radicle Emergence ◽  
O2 Production

The salinity induced inhibition of seeds germination remains not clear at physiological levels. The aims of this study is to investigate the effect of salt on germination, embryo growth, superoxide anion radical (O2·-) and the respiratory activity (TTC reduction) in Crithmum maritimum L. seeds. Thus the embryo growth, in situ localization of respiratory activity and superoxide anion radical (O2·-) localization, were investigated. Chlorure 2, 3, 5-triphényltétrazolium (TTC) reduction test and superoxide anion radical (O2·-) localization with Nitroblue Tetrazolium Chloride (NBT) were performed in embryo isolated from seeds of the halophyte Crithmum maritimum L either sown in distilled water or in 200 mM NaCl. The key results show that germination was maximal (90 %) in distilled water, but was fully inhibited following seed exposure to NaCl. The completion of the embryo growth (ca. 2 mm length) leading to the radicle emergence took 6 d in H2O, but was markedly delayed by salt. NaCl reduced the elongation zone in the embryo axis, hence indicating that the cell division and/or cell elongation were disturbed by salinity. The respiratory activity (TTC reduction) and O2·- production in the cotyledon were significantly lowered by salinity.

Hydroxyalkyloxy substituted tetraphenylporphyrins: Mechanism and superoxide scavenging activity

2016 ◽  
Vol 20 (12) ◽  
pp. 1477-1485 ◽  
Author(s):  
Sergey M. Kuzmin ◽  
Svetlana A. Chulovskaya ◽  
Vladimir I. Parfenyuk
Keyword(s):  
Superoxide Anion ◽  
Anion Radical ◽  
Antioxidant Properties ◽  
Superoxide Anion Radical ◽  
Nucleophilic Attack ◽  
Scavenging Activity ◽  
The Novel ◽  
Superoxide Scavenging Activity ◽  
Electrochemical Approach

The novel electrochemical approach based on coulometric response of electro-generated superoxide (O[Formula: see text] was used to determine scavenging properties of 2H-5,10,15,20-tetrakis (4-hydroxyphenyl)porphyrin (H[Formula: see text]T(4-OHPh)P); 2H-5,10,15,20-tetrakis[4-(2-hydroxyethyloxy)phenyl]porphyrin (H[Formula: see text]T(4-OH(CH[Formula: see text]OPh)P); 2H-5,10,15,20-tetrakis[4-(4-hydroxybutyloxy)phenyl]porphyrin (H[Formula: see text]T(4-OH(CH[Formula: see text]OPh)P); Zn-5,10,15,20-tetrakis[4-(4-hydroxyethyloxy)phenyl]porphyrin (ZnT(4-OH(CH[Formula: see text]OPh)P) superoxide. It has been identified that the porphyrins under study possess good antioxidant properties. The analysis of possible interactions between porphyrins and superoxide anion-radical has shown that high values of superoxide scavenging activity of tetraphenylporphyrins with alcohol chains can be explained by the nucleophilic attack of O[Formula: see text] on the C–C bonds of alcohol.

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
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