Fullerol-Sensitized Production of Reactive Oxygen Species in Aqueous Solution

2005 ◽  
Vol 39 (5) ◽  
pp. 1359-1365 ◽  
Author(s):  
K. D. Pickering ◽  
M. R. Wiesner
Keyword(s):  
Reactive Oxygen Species ◽  
Aqueous Solution ◽  
Reactive Oxygen ◽  
Oxygen Species

scholarly journals Generation of reactive oxygen species by promoting the Cu(II)/Cu(I) redox cycle with reducing agents in aerobic aqueous solution

2018 ◽  
Vol 78 (6) ◽  
pp. 1390-1399 ◽  
Author(s):  
Wenshu Li ◽  
Peng Zhou ◽  
Jing Zhang ◽  
Yongli Zhang ◽  
Gucheng Zhang ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Aqueous Solution ◽  
Superoxide Radical ◽  
Reactive Oxygen ◽  
Reducing Agents ◽  
Oxygen Species ◽  
Redox Cycle ◽  
Copper Species ◽  
Chain Reactions ◽  
H2o2 Generation

Abstract This study investigated the generation of reactive oxygen species (ROS) (O2−•, H2O2, and HO•) by promoting the Cu(II)/Cu(I) redox cycle with certain reducing agents (RAs) in aerobic aqueous solution, and benzoic acid (BA) was employed as indicator for the hydroxyl radical (HO•). Hydroxylamine (HA) can reduce Cu(II) to Cu(I) to induce chain reactions of copper species resulting in the generation of the superoxide radical (O2−•) and hydrogen peroxide (H2O2), and the intermediate Cu(I) can further activate H2O2 via a Fenton-like reaction to produce HO•, creating the remarkable BA degradation. O2 is indispensable, and unprotonated HA is the motive power in the O2/Cu/HA system. Moreover, pH is a crucial factor of the O2/Cu/HA system due to the protonated HA not being able to reduce Cu(II) into Cu(I). The oxidation of HA can be effectively induced by trace amounts of Cu(II), and both a higher HA dosage and a higher Cu(II) dosage can enhance H2O2 generation and BA degradation. In addition, some other RAs that can reduce Cu(II) into Cu(I) could replace HA in the O2/Cu/HA system to induce the generation of these ROS in aerobic aqueous solution.

Colorimetric and Fluorescent Probe for Hypochlorite with High Selectivity

2013 ◽  
Vol 295-298 ◽  
pp. 475-478 ◽  
Author(s):  
Zhi Xiang Han ◽  
Ming Hui Du ◽  
Guo Xi Liang ◽  
Xiang Yang Wu
Keyword(s):  
Reactive Oxygen Species ◽  
Aqueous Solution ◽  
Detection Limit ◽  
Fluorescent Probe ◽  
Rhodamine B ◽  
High Selectivity ◽  
Reactive Oxygen ◽  
Living Cells ◽  
Oxygen Species ◽  
Turn On

Rhodamine B thiohydrazide (RBS) was firstly employed as turn-on fluorescent probe for hypochlorite in aqueous solution and living cells. It exhibits a stable response to hypochlorite from 1.0×10-6to 1.0×10-5M with a detection limit of 3.3×10-7M. The response of this probe to hypochlorite is fast and highly selective compared with other reactive oxygen species (such as.OH,1O2, H2O2) and other common anions (such as X-, ClO2-, ClO4-, NO3-, NO2-, OH-, Ac-, CO32-, SO42-).

Role of in situ electrogenerated reactive oxygen species towards degradation of organic dye in aqueous solution

2020 ◽  
Vol 344 ◽  
pp. 136146 ◽  
Author(s):  
Md. Saddam Hossain ◽  
M. Yousuf A. Mollah ◽  
Md. Abu Bin Hasan Susan ◽  
Md. Mominul Islam
Keyword(s):  
Reactive Oxygen Species ◽  
Aqueous Solution ◽  
Reactive Oxygen ◽  
Organic Dye ◽  
Oxygen Species

Photosensitization mechanism of Cu(ii) porphyrins

2017 ◽  
Vol 19 (31) ◽  
pp. 20533-20540 ◽  
Author(s):  
Jon Uranga ◽  
Jon M. Matxain ◽  
Xabier Lopez ◽  
Jesus M. Ugalde ◽  
David Casanova
Keyword(s):  
Reactive Oxygen Species ◽  
Aqueous Solution ◽  
Reactive Oxygen ◽  
Oxygen Species

This work presents the mechanism of the photoinduced generation of reactive oxygen species (ROS) by paramagnetic copper porphyrins in aqueous solution.

scholarly journals Reactive Oxygen Species Generation in Human Cells by a Novel Magnetic Resonance Imaging Contrast Agent

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Li Wang ◽  
Eric Lin ◽  
Mary J. Johansen ◽  
Timothy Madden ◽  
Edward Felix ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Reactive Oxygen Species ◽  
Aqueous Solution ◽  
Magnetic Resonance ◽  
Cultured Cells ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Ros Production ◽  
Oxygen Species ◽  
Resonance Imaging

The novel positive-contrast magnetic resonance imaging (MRI) marker C4 consists of an aqueous solution of cobalt chloride (CoCl2) complexed with the chelator N-acetylcysteine (NAC). We evaluated whether the presence of C4 or its components would produce reactive oxygen species (ROS, including hydroxyl, peroxyl, or other reactive oxygen species) in cultured cells. Human cancer or normal cells were incubated with 1% (w/v) CoCl2·6H2O or 2% NAC or a combination of both (1% CoCl2·6H2O : 2% NAC in an aqueous solution, abbreviated as Co : NAC) in the presence or absence of H2O2. Intracellular ROS levels were measured and quantified by change in relative fluorescence units. Student’s t-tests were used. In all cell lines exposed to 1000 μM H2O2, the Co : NAC led to ≥94.7% suppression of ROS at 5 minutes and completely suppressed ROS at 60 and 90 minutes; NAC suppressed ROS by ≥76.6% at 5 minutes and by ≥94.5% at 90 minutes; and CoCl2·6H2O suppressed ROS by ≥37.2% at 30 minutes and by ≥48.6% at 90 minutes. These results demonstrate that neither Co : NAC nor its components generated ROS; rather, they suppressed ROS production in cultured cells, suggesting that C4 would not enhance ROS production in clinical use.

Photoinduced Formation of Reactive Oxygen Species from the Acid Form of 6-(Hydroxymethyl)pterin in Aqueous Solution

2006 ◽  
Vol 89 (6) ◽  
pp. 1090-1104 ◽  
Author(s):  
Andrés H. Thomas ◽  
Romina Cabrerizo ◽  
Mariana Vignoni ◽  
Rosa Erra-Balsells ◽  
Franco M. Cabrerizo ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Aqueous Solution ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Acid Form

Photolysis of atrazine in aqueous solution: role of process variables and reactive oxygen species

2014 ◽  
Vol 21 (21) ◽  
pp. 12135-12142 ◽  
Author(s):  
Marcela Prado Silva ◽  
Ana Paula dos Santos Batista ◽  
Sueli Ivone Borrely ◽  
Vanessa Honda Ogihara Silva ◽  
Antonio Carlos Silva Costa Teixeira
Keyword(s):  
Reactive Oxygen Species ◽  
Aqueous Solution ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Process Variables
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