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Showing 1 to 20 of 37 for “"Fenton reaction"”.
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Hydroxyl radical production via the photo-Fenton reaction in natural waters
… investigates the importance of photo-Fenton chemistry in natural waters. The Fenton reaction, H202 + Fe(ll) [right arrow] Fe(ll) + OH- + OH', can occur in sunlit waters because both H202 and Fe(ll) are photo-chemically produced. Photo-Fenton chemistry was investigated by irradiating …
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The effect of selected colonic metabolites of polyphenols on the copper-triggered Fenton reaction and hemolysis
… of polyphenols on the copper-triggered Fenton reaction and hemolysis Keywords: polyphenol, metabolite, copper, Fenton reaction, hemolysis, antioxidant, pro- oxidant Copper is an essential trace biogenic element that plays a pivotal role in various physiological processes within the human …
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The reaction pathways of hydrogen peroxide in the presence of scavengers and its transition metal catalyzed oxidation of disulfide bridge containing peptides
… breakdown of an intermediate formed during the reaction. Sodium pyruvate is a potential base for the creation of a peroxide scavenger. It readily reacts with H2O2 to yield sodium acetate, carbon dioxide and water as final products. A low temperature nuclear magnetic resonance protocol has been …
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Photodegradation of peptides and proteins by near UV and visible light
… of various reactive species via the photo-Fenton reaction. Three pharmaceutical relevant carboxylic acid buffers (citrate, acetate, and succinate) were tested under near UV and visible light. Oxidation reactions were monitored for model peptides containing readily oxidizable amino acids. …
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Complexation of Organic Guests and Coordination of Metal Ions by Cyclodextrins: Role of Cyclodextrins in Metal-Guest Interactions
… manufacture, testing, and disposal facilities. Fenton chemistry (ferrous ion catalyzed generation of hydroxyl radicals) has shown utility in the remediation of TNT in soils but it suffers from non-specificity and the need for acidic conditions to prevent loss of iron as iron hydroxides. …
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Testing oxidative-stress hypotheses generated by systems-biology assays
… suggesting that the DNA damage was caused by the Fenton reaction. Spin-trapping experiments confirmed that Hpx- yaaA cells had a higher hydroxyl radical level than yaaA+ strains. EPR analysis showed that the proximate cause was an unusually high level of intracellular unincorporated iron. These …
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The Mechanism of Oxygen and Nitric Oxide Toxicity in Escherichia Coli
… killed cells by damaging their DNA through the Fenton reaction. NO also blocked respiration, an event which previous studies have shown can stimulate oxidative DNA damage. The resultant accumulation of NADH accelerates the reduction of free flavins by flavin reductase, and these reduced flavins …
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The effects of simulated inflammatory conditions on the corrosion and fretting corrosion of CoCrMo alloy
… chemicals such as H2O2, HClO, acid and Fenton reaction (H2O2 and Fe3+) were able to facilitate the corrosion of CoCrMo alloy and demonstrated part of the mechanism of inflammatory cell induced corrosion. The effect of inflammatory species hydrogen peroxide and voltage on the passive …
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EFFECT OF WATERCRESS EXTRACT AND KAEMPFEROL AGAINST OXIDATIVESTRESS
… reactive free radicals, were generated via the Fenton reaction (1mM FeSO4 with 7mM H2O2) and their presence was confirmed by the methylene blue bleaching test. Spectroscopic techniques including circular dichroism (CD), UV-Vis absorption, and steady-state fluorescence spectroscopy and dynamic …
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The Mechanism of Copper Toxicity in Escherichia Coli
… to be mediated by oxidative DNA damage through a Fenton-like reaction. In contrast to this hypothesis, copper-stressed Escherichia coli sustained less oxidative DNA damage than unsupplemented cells. The levels of hydroxyl radical formation between copper-stressed and unsupplemented cells were …
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Metal induced degradation of leather
… catalysed decomposition of hydrogen peroxide (Fenton reaction), is considered to be the major cause for the observed oxidative denaturation of the fibrous collagen. An investigation on the oxidative effect of a dilute solution of Fenton reagent (0.2M H202, 0.03M Fe2+) showed that hydroxyl …
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DESIGN AND SYNTHESIS OF PURINE BASED NEUROPROTECTORS AND NOVEL SYNTHETIC METHODS FOR THE TRIFLUOROMETHYLATION OF ALDEHYDE HYDRAZONES
… modulate oxidative stress induced by the Fenton reaction-generated reactive oxygen species (ROS).</p> <p>The C(sp<sup>2</sup>−H)-trifluoromethylation of hydrazones would give access to the αtrifluoromethylated hydrazones that can serve as intermediates in the synthesis of pharmaceutically …
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Identification and characterization of a novel class of hydrogen peroxide targets in escherichia coli
… to accumulation of damage to DAHP synthase by a Fenton reaction between H2O2 and the active-site Fe atom. This damage results in pathway failure and an inability to synthesize aromatic compounds. The cell attempts to compensate by inducing DAHP synthase transcription, but this is not enough. Mn2+ …
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Rethinking the dithiothreitol based PM oxidative potential: measuring DTT consumption versus ROS generation
… PQ, 1,2-NQ, 1,4-NQ and 5H-1,4NQ, respectively). Fenton reaction is responsible for the synergistic effect observed, as superoxide radicals (O2•-) formed by quinones are efficiently converted to •OH by Fe(II) through Fenton reaction. Ten ambient PM samples collected from an urban site were …
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Sustainable Hydrogels for Water Treatment
… microparticles. Iron is used to catalyze a Fenton reaction, converting added hydrogen peroxide to highly reactive hydroxyl radicals that oxidize hazardous organic micropollutants into safer small molecules. An appropriate chemistry allows us to implement the Fenton reaction, which normally …
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Detection and analysis of spin trapped radical adducts using thermal desorption gas chromatography mass spectrometry (TD-GC-MS)
… or Mass Spectrometry (MS). In the current study, Fenton chemistry has been used to generate hydroxyl radicals. Sincethe hydroxyl radical adduct of the spin-trap N-tert-butyl-α-phenylnitrone (PBN) is shortlivedat room temperature a secondary trapping technique is employed. The resultingspin-trapped …
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Complexation state of iron and copper in ambient particulate matter and its effect on the oxidative potential
… of Fe-SRFA complexes to convert H2O2 to ∙OH (Fenton reaction) than Fe alone. Although, Cu and SRFA show additive effect in ∙OH production, while they are antagonistic in the consumption of antioxidants (ascorbic acid and glutathione). Overall, the organic complexation of metals in ambient PM …
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Decomposition of hydrogen peroxide and organic compounds in the presence of iron and iron oxides
… hydrogen peroxide (H202) with either Fe(II) (the Fenton reaction), Fe(1), or iron oxide. This dissertation investigated the factors that influence the decomposition rates of H202 and organic compounds, as well as the generation rate of -OH (VoH), in the presence of dissolved Fe(IH) and iron oxide. …
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Interactions of paraquat and nitrodiphenylether herbicides with the chloroplast photosynthetic electron transport in the activation of toxic oxygen species
… and diphenylether herbicides with the Mehler reaction as investigated. Sera from two different rabbits (RS1 & RS2) were examined for their patterns of inhibition of the photosynthetic electron transport (PET) system. Serum from RS2 was greatly hemolyzed. Fifty ul of RS1 serum were required for …
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Production of Light-independent Reactive Oxygen Species during Microbially-mediated Fe(II)/Fe(III) redox cycling and its Application in the Degradation of Organic Contaminants
… represents a potential source of •OH via the Fenton reaction, which is commonly used in remediation for organic contaminant degradation. The degradation of various organic contaminants during aerobic oxidation of Fe(II) species without addition of exogenous peroxide has also been demonstrated, …
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