Formation of the paramagnetic complex [Cr(OH)5O2]5− in the reaction between chromium(VI) oxide, and hydrogen peroxide or superoxide anion radicals studied by EPR spectroscopy

1999 ◽  
Vol 26 (9-10) ◽  
pp. 1134-1137
Author(s):  
Carl Lagercrantz
Keyword(s):  
Hydrogen Peroxide ◽  
Epr Spectroscopy ◽  
Superoxide Anion ◽  
Paramagnetic Complex ◽  
Chromium Vi ◽  
Superoxide Anion Radicals ◽  
Anion Radicals

An ESR study of UV-irradiated solutions of tetramethylammonium mercaptoundecahydro-closo-dodecaborate(2-) at 77 K

1991 ◽  
Vol 56 (3) ◽  
pp. 657-662 ◽  
Author(s):  
Pavel Stopka ◽  
Oldřich Štrouf
Keyword(s):  
Hydrogen Peroxide ◽  
Aqueous Solutions ◽  
Ultraviolet Irradiation ◽  
Superoxide Anion ◽  
Oxygen Molecule ◽  
Superoxide Anion Radicals ◽  
Anion Radicals

The superoxide anion-radicals O2·- are generated by the ultraviolet irradiation of air- or oxygen-saturated aqueous solutions of tetramethylammonium mercaptoundecahydro-closo-dodecaborate(2-) at 77 K. The superoxide anion-radicals are formed from the oxygen molecule coordinated on the mercaptoundecahydro-closo-dodecaborate dianion. In the absence of this dianion no O2·- are generated. By the irradiation in the presence of hydrogen peroxide the formation of the superoxide anion-radicals is more intensive than in the presence of oxygen only. Simultaneously with O2·- generation the corresponding thiol radicals are formed. These radicals give the disulfide compound [B12H11S]24-. A possible role of sulfur-centered radicals in the autoxidation transformations of the mercaptoundecahydro-closo-dodecaborate dianion is discussed.

The uremic solute indoxyl sulfate acts as an antioxidant against superoxide anion radicals under normal-physiological conditions

FEBS Letters ◽  
2010 ◽  
Vol 584 (13) ◽  
pp. 2816-2820 ◽  
Author(s):  
Yohei Miyamoto ◽  
Yasunori Iwao ◽  
Yuka Tasaki ◽  
Keizo Sato ◽  
Yu Ishima ◽  
...  
Keyword(s):  
Superoxide Anion ◽  
Indoxyl Sulfate ◽  
Physiological Conditions ◽  
Superoxide Anion Radicals ◽  
Anion Radicals

Study of the simulated sunlight photolysis mechanism of ketoprofen: the role of superoxide anion radicals, transformation byproducts, and ecotoxicity assessment

2017 ◽  
Vol 19 (9) ◽  
pp. 1176-1184 ◽  
Author(s):  
Yingfei Wang ◽  
Wen Deng ◽  
Fengliang Wang ◽  
Yuehan Su ◽  
Yiping Feng ◽  
...  
Keyword(s):  
Superoxide Anion ◽  
Simulated Sunlight ◽  
Sunlight Irradiation ◽  
Superoxide Anion Radicals ◽  
Anion Radicals

ROS play a key role in the photolysis of KET under simulated sunlight irradiation and the photoproducts may still have toxicity.

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