• The use of urea-hydrogen peroxide as terminal oxidant in the presence of diphenyl diselenide as catalyst enables a highly selective catalytic oxidation of sulfides into the corresponding sulfoxides. (organic-chemistry.org)
  • Urea-hydrogen peroxide is a non-toxic, odorless crystalline solid. (organic-chemistry.org)
  • Urea-hydrogen peroxide in the presence of a catalytic amount of magnesium bromide efficiently oxidizes primary and secondary benzylic alcohols into the corresponding aromatic aldehydes and ketones. (organic-chemistry.org)
  • Methyltrioxorhenium (MTO) catalyzes an oxidation of methyl trimethylsilyl ketene acetals with urea hydrogen peroxide to afford α-hydroxy and α-siloxy esters. (organic-chemistry.org)
  • Eco-friendly laboratory procedures allow the oxidative iodination of various activated and deactivated arenes with molecular iodine, in the presence of UHP (percarbamide), a stable, strongly H-bonded, solid urea-hydrogen peroxide adduct as the oxidant. (organic-chemistry.org)
  • Urea-hydrogen peroxide adduct (UHP) is stable, inexpensive and an easily handled reagent. (organic-chemistry.org)
  • The use of urea-hydrogen peroxide and phthalic anhydride in ethyl acetate enables a metal-free, environmentally benign oxidation of substituted sulfides to their corresponding sulfones without observation of the possible sulfoxide oxidation product. (organic-chemistry.org)
  • Advanced Oxidation Processes for Dye Removal From Wastewater. (igi-global.com)
  • Advanced oxidation processes (AOPs), namely the Fenton oxidation, ozonation, electrochemical oxidation, and photocatalysis, are potential alternative techniques for dye removal from textile effluents. (igi-global.com)
  • In order to understand the reactions pathway, the oxidation of 1-indanol, 1-indanone, 1H-indene, 1-tetralol and 1-tetralone is also carried out with an iron(Ill)-substituted polyoxotungstate as catalyst and H(2)O(2) as oxidant. (ua.pt)
  • With the same oxidant and medium the oxidation of glycerol was also explored in the presence of 1 and 2, as well as of two similar iron(II) complexes bearing tridentate ligands, i.e. (units.it)
  • A general, high yielding, and user and environmentally friendly catalytic oxidation procedure for the chemoselective oxidation of imines to nitrones is reported. (organic-chemistry.org)
  • To improve the rheological properties of zein doughs, a-type zein and zein-starch doughs were prepared with the oxidising agents, hydrogen peroxide and peroxidase, which strengthen gluten-based doughs by cross-linking. (edu.au)
  • Hydrogen peroxide and peroxidase increased zein dough extensibility compared to preparation with water. (edu.au)
  • Here, we reported a new phenomenon-the enzymatic oxidation of a single layer of graphitic carbon by horseradish peroxidase (HRP). (cdc.gov)
  • The hydrogen peroxide combines with 4-chlorophenol under the action of peroxidase to produce an oxidation product that that does not react with the colorometric component of reagent 2. (cdc.gov)
  • NO is also involved in cell kil ing but often used as a marker of oxidative Hanahan and Weinberg (2011), i n can also react with superoxide at DNA damage, although other bas- their landmark review "Hallmarks diffusion-limited rates to form per- es are also susceptible to oxidation. (who.int)
  • Phenomena such as the ORR surface structure sensitivity and the lack of a reduction current at high potentials are discussed in the light of the surface oxidation and disordering processes and the possible relevance of the hydrogen peroxide reduction and oxidation reactions in the ORR mechanism. (beilstein-journals.org)
  • [6] The processes of oxidation and reduction occur simultaneously and cannot occur independently. (wikipedia.org)
  • Ultimately, the meaning was generalized to include all processes involving the loss of electrons or the increase in the oxidation state of a chemical species. (wikipedia.org)
  • 2005). Advance oxidation processes are widely used both in industrial preparations and in environmental treatments. (scialert.net)
  • 2007). These processes are based on the production of very reactive hydroxyl radicals with an oxidation potential of 2.8 V as primary oxidizing species (Aleboyeh et al . (scialert.net)
  • Reduction and oxidation of hydrogen peroxide on polycrystalline platinum. (mpg.de)
  • [4] Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a decrease in the oxidation state. (wikipedia.org)
  • The oxidation alone and the reduction alone are each called a half-reaction because two half-reactions always occur together to form a whole reaction. (wikipedia.org)
  • The nanocomplex with a highly reductive ligand field can promote oxygen reduction reactions generating hydrogen peroxide. (nature.com)
  • To counter high ROS levels, cells have antioxidant mechanisms that reduce the excess ROS in the cell and keep the 'redox' (from reduction and oxidation) balance of the cell. (elifesciences.org)
  • The total synthesis of both compounds has been reported, and each includes a step in which a dioxolane system is formed using trifluoroperacetic acid (TFPAA), prepared by the hydrogen peroxide - urea method. (wikipedia.org)
  • A combination of 1,1,1,3,3,3-hexafluoroispropanol (HFIP) and H 2 O 2 enables a straightforward synthesis of N,N -disubstituted formamides from imines in very good yields via an oxidation-rearrangement sequence under smooth reaction conditions. (organic-chemistry.org)
  • 2005. Synthesis of peroxynitrite from nitrite and hydrogen peroxide. . (oregonstate.edu)
  • Indane oxidation reactions produce also dehydrogenation and hydroperoxidation products. (ua.pt)
  • Although oxidation reactions are commonly associated with the formation of oxides, other chemical species can serve the same function. (wikipedia.org)
  • They participate in important peroxisome-specific chemical reactions, such as beta-oxidation of very-long-chain fatty acids (VLCFAs) and detoxification of hydrogen peroxide. (medscape.com)
  • It's cheap, doesn't tend toward explosive reactions like hydrogen peroxide, doesn't require metal catalysts, and its waste product is table salt. (acs.org)
  • The second reaction is driven by the reagents from bottle 1, with lipase added in reagent 2 to convert triglycerides to glycerol, and 4-aminophenzone added to react with the hydrogen peroxide produced in the last reaction. (cdc.gov)
  • The observed product distributions were discussed regarding direct oxidation by the valence band holes or indirect oxidation by surface-bound hydroxyl radical intermediates. (caltech.edu)
  • Moreover, the resultant two-electron oxidation form of GA-Fe is an excellent Fenton-like agent that can catalyze hydrogen peroxide decomposition into hydroxyl radical, finally triggering severe oxidative damage to tumors. (nature.com)
  • Further, hydrogen peroxide treatment did not increase zein film glass transition temperature, but it did increase transition enthalpy, and film water uptake increased with hydrogen peroxide concentration. (edu.au)
  • Footnote 20 Levels of undissociated hydrogen sulphide were undetectable in Florida Bay, Footnote 21 and a maximum concentration of 14 µg/L has been recorded for the Arabian Sea. (canada.ca)
  • The effects of operating parameters such as hydrogen peroxide dosage, pH, initial dye concentration and UV dosage, on decolorization have been evaluated. (scialert.net)
  • The rate increased linearly with volumetric UV dosage and nonlinearly with increasing initial hydrogen peroxide concentration. (scialert.net)
  • This simulation was conducted on the changes in hydrogen and syngas concentration according to the variations of equivalence ratio, intake temperature, oxygen enrichment, engine speed, initial pressure, and fuel additives with partial oxidation combustion. (edu.sa)
  • 58 exposed to the allergen in a concentration exceeding the Oxidation individual threshold. (cdc.gov)
  • In the presence of low concentrations of hydrogen peroxide (approximately 40 uM), HRP catalyzed the oxidation of graphene oxide, which resulted in the formation of holes on its basal plane. (cdc.gov)
  • Footnote 15 Natural waters containing elevated concentrations of hydrogen sulphide are used for therapeutic baths and have been consumed for medical purposes. (canada.ca)
  • Improved performance of Si nanowire arrays for capacitor electrodes in ionic liquid [Bmim][NTf2], is obtained by spin-on-doping the nanowires followed by hot, concentrated nitric acid oxidation. (imperial.ac.uk)
  • Oxidation with nitric acid was examined by LJUBOWIN as early as 1875 and patented in 1942 [19]. (sciencemadness.org)
  • A generally accepted, classical scheme for this reaction, in which hydrogen peroxide is a stable reaction intermediate species, can be depicted by Scheme 1 [1] . (beilstein-journals.org)
  • Oxidation originally implied a reaction with oxygen to form an oxide. (wikipedia.org)
  • We have investigated a series of H64D mutants of Mbs in which Asp-64 accelerates the reaction of the Mbs with hydrogen peroxide and stabilizes the resulting active species: compound I (iron oxo-ferryl porphyrin π- cation radical). (rsc.org)
  • I read up on this once, it's hard to prevent further oxidation, how do you suppose it'd easily work with a Cu-catalysed reaction? (sciencemadness.org)
  • The reaction enabled quantification of peracetic acid with high specificity over the common co-contaminants hydrogen peroxide and acetic acid, which were introduced in 10-fold and 100-fold excess to challenge the reaction. (cdc.gov)
  • A new research report in ACS Nano ( ' In Situ Oxidation Studies of High-Entropy Alloy Nanoparticles' ) offers key insights into how HEA nanoparticles behave under high-temperature oxidizing environment and sheds light on future design options of highly stable alloys under complex service conditions. (nanowerk.com)
  • Schematic illustration of the oxidation process of high-entropy alloy nanoparticles. (nanowerk.com)
  • We were intrigued to find out that the transition metals in HEA nanoparticles can co-segregate into the oxide layer and form a disordered phase that can slow down the whole oxidation process. (nanowerk.com)
  • For the first time, this work directly captured the whole oxidation process of HEA nanoparticles in real-time and at the nanoscale. (nanowerk.com)
  • It also confirms the much slower oxidation kinetics of HEA nanoparticles. (nanowerk.com)
  • Schematic of the in situ gas-cell (S)TEM device to study the oxidation of HEA nanoparticles. (nanowerk.com)
  • The researchers managed to successfully capture the high-temperature oxidation of FeCoNiCuPt HEA nanoparticles in real-time by utilizing the advanced in situ gas-cell transmission electron microscopy (TEM) technique combined with density functional theory (DFT) calculations. (nanowerk.com)
  • We found that the oxidation kinetics of HEA nanoparticles are significantly slower than those of monometallic and bimetallic alloys,' says Song. (nanowerk.com)
  • Combining in situ energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS) analyses, we confirmed that the oxidation of HEA nanoparticles are governed by Kirkendall effects displaying outwards segregation of Fe, Co, Ni and Cu. (nanowerk.com)
  • For example, the mechanism that controls the oxidation process and why the differences are so huge compared to monometallic nanoparticles is still unknown. (nanowerk.com)
  • Efficient Catalytic Production of Hydrogen Peroxide Using Tin-containing Zeolite Fixed Palladium Nanoparticles with Oxidation Resistance. (bvsalud.org)
  • The isomeric 1,2-dioxolane (wherein the two oxygen centers are adjacent) is a peroxide. (wikipedia.org)
  • For example, in the rusting of iron , the oxidation state of iron atoms increases as the iron converts to an oxide , and simultaneously the oxidation state of oxygen decreases as it accepts electrons released by the iron. (wikipedia.org)
  • Several studies have been devoted to understanding the corrosion behaviors of HEAs such as oxidation in air and oxygen-containing atmospheres. (nanowerk.com)
  • Temperature, salinity and dissolved oxygen also affect the amount of hydrogen sulphide found in the undissociated form. (canada.ca)
  • The hydrogen/syngas yields increase with increasing intake temperature and oxygen contents in air. (edu.sa)
  • Through the parametric screening studies, optimum operating conditions for natural gas partial oxidation reforming are recommended at 3.0 equivalence ratio, 530 K intake temperature, 0.3 oxygen enrichment, 500 rpm engine speed, 1 atm initial pressure, and 7.5% hydrogen peroxide. (edu.sa)
  • Whereas the mitochondria are responsible for the oxidation of the bulk of dietary fatty acids (palmitate, oleate and linolate), peroxisomes are responsible fully for the beta oxidation of VLCFAs (C24:0 and C26:0) in addition to pristanic acid (from dietary phytanic acid) and dihydroxycholestanoic acid (DHCA) or trihydroxycholestanoic acid (THCA). (medscape.com)
  • When the enzymes do not work correctly, fatty acids and hydrogen peroxide build up, causing damage in many areas in the body. (msdmanuals.com)
  • The homogeneous liquid phase oxidation of indane and tetralin with hydrogen peroxide catalysed by tetrabutylammonium salts of iron(III)-substituted polyoxotungstates of general formula [XW(11)Fe(H(2)O)O(39)](n-), X=P, Si or B is described. (ua.pt)
  • The production of hydrogen and syngas from natural gas using a homogeneous charge compression ignition reforming engine is investigated numerically. (edu.sa)
  • Effect of hydrogen peroxide, periodate, and persulfate on photocatalysis of 2-chlorobiphenyl in aqueous TiO 2 suspensions. (nih.gov)
  • UHP is used in an efficient solid state oxidation of different organic molecules: hydroxylated aldehydes and ketones (to hydroxylated phenols), sulfides (to sulfoxides and sulfones), nitriles (to amides) and nitrogen heterocycles (to N -oxides). (organic-chemistry.org)
  • In particular, we investigate the impacts of using different methods to estimate compound vapour pressures as well as simulating the formation of highly oxygenated organic molecules (HOM) via auto-oxidation on SOA formation indoors. (cdc.gov)
  • Hydrogen sulphide and sulphides of the alkali and alkaline earth metals are soluble in water. (canada.ca)
  • Here, we simulate this post-burial process through artificial maturation experiments using three synthetic and one natural eumelanin exposed to mild (100 ◦ C/100 bar) and harsh (250 ◦ C/200 bar) environmental conditions, followed by chemical analysis employing alkaline hydrogen peroxide oxidation (AHPO) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). (lu.se)
  • C/200 bar) environmental conditions, followed by chemical analysis employing alkaline hydrogen peroxide oxidation (AHPO) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). (lu.se)
  • In case of the compound [TMG][B(C 6 F 5 ) 4 ] hydrogen-fluorine contacts between cation and anion are present in the solid state. (znaturforsch.com)
  • Owing to H … F contacts between hydrogen peroxide and the fluorine substituents of the anion and the resulting activation of H 2 O 2 in solution, the compound [P 4,4,4,14 ][B(C 6 H 3 -3,5-(CF 3 ) 2 ) 4 ] is applicable as an efficient mediator for the oxidation of sulfides to sulfoxides. (znaturforsch.com)
  • When we mixed pH 3 enzyme tube with substrate tube, we used 0.3 mL of hydrogen peroxide, but if we were to increase the amount, then the experiment would have been faster. (ipl.org)
  • Traditional metals or alloys are believed to form crystalline oxides based on the composition and oxidation conditions, but when five or more principle elements are involved in a single phase, novel behavior during oxidation may exist due to the built-in high entropy,' Boao Song from the Department of Mechanical and Industrial Engineering at the University of Illinois at Chicago, and the paper's first author, tells Nanowerk. (nanowerk.com)
  • These findings suggest the possibility of utilizing these high-entropy alloys for applications where high thermal stability and oxidation resistance are required. (nanowerk.com)
  • The catalyzed oxidation of bulky secondary alcohols to ketones is "an especially remarkable example," Kimura adds. (acs.org)
  • Confocal laser scanning microscopy revealed that in zein-starch doughs prepared with hydrogen peroxide a thin continuous zein matrix was formed around the starch granules, whereas doughs prepared with water exhibited clumps of granules. (edu.au)
  • The enzymatic oxidation was characterized by Raman, ultraviolet-visible, electron paramagnetic resonance, Fourier transform infrared spectroscopy, transmission electron microscopy, atomic force microscopy, sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and gas chromatography-mass spectrometry. (cdc.gov)
  • The advanced in situ transmission electron microscopy (TEM) technique used by the UIC team allows real-time imaging and analytical methods, and thus provides clear evidence of the co-segregation of transition metals during the oxidation process. (nanowerk.com)
  • It has been found that the degradation rate increased until an optimum of hydrogen peroxide dosage, beyond which the reagent exerted an inhibitory effect. (scialert.net)
  • The simulation results indicate that the hydrogen/syngas yields are strongly dependent on the equivalence ratio with maxima occurring at an optimal equivalence ratio varying with engine speed. (edu.sa)
  • The hydrogen/syngas yields also increase with increasing initial pressure, especially at lower temperatures, yet high temperature can suppress the pressure effect. (edu.sa)
  • Furthermore, it was found that the hydrogen/syngas yields increase when using fuel additives, especially hydrogen peroxide. (edu.sa)
  • It is proposed that the effects are primarily due to hydroxylation of amino acid aliphatic side chains, improving hydration through hydrogen bonding. (edu.au)
  • The differences among coal types are attributed to differences in the ability of the ash to catalyze the oxidation of sulfur dioxide and neutralize the resulting acid. (cdc.gov)
  • In brief, glucose could be transferred to hydrogen peroxide (H 2 O 2 ) and gluconic acid with the help of glucose oxidase (GOD). (frontiersin.org)
  • Another major function of the peroxisomal beta-oxidation system is related to the biosynthesis of polyunsaturated fatty acid (C22:6w3). (medscape.com)
  • Destruction of humic acid in water by UV light-catalyzed oxidation with hydrogen peroxide. (nih.gov)
  • The greatly increased extensibility of hydrogen peroxide prepared zein doughs and their improved water-holding are not due to oxidative cross-linking. (edu.au)
  • OTf = CF3SO3) (1) and [Fe(bpydeg)3](OTf)2 (bpydeg = N4,N4-bis(2-(2-methoxyethoxy)ethyl) [2,2'-bipyridine]-4,4'-dicarboxamide) (2), the latter being a newly synthesized ligand, were employed as catalyst precursors for the oxidation of 1-phenylethanol with hydrogen peroxide in water, using either microwave or conventional heating. (units.it)
  • This organic spray uses an active ingredient that is a combination of Sodium Carbonate infused with Hydrogen Peroxide Once this active ingredient is activated with water, it will release the Hydrogen Peroxide. (arbico-organics.com)
  • In addition, the rates of oxidation were higher in seawater than in air-saturated water. (canada.ca)
  • 2004). UV/H 2 O 2 process has been recognized that the efficiency of the oxidation process strongly depends on experimental conditions (García Einschlag et al . (scialert.net)
  • This perspective focuses on two areas that have yielded new useful information during the last 20 years: (i) structure-activity relationship (SAR) studies of contact allergy based on the concept of hapten-protein binding and (ii) mechanistic investigations regarding activation of nonsensitizing compounds to contact allergens by air oxidation or skin metabolism. (cdc.gov)
  • mechanistic investigations regarding activation of nonsensitizing compounds to contact allergens by air oxidation or skin metabolism. (cdc.gov)
  • Antithyroid drugs such as the thiourea group inhibit iodide oxidation and therefore its subsequent incorporation into monoiodotyrosine (MIT) and diiodotyrosine (DIT). (medscape.com)
  • An advanced oxidation process, UV/H 2 O 2 , was investigated in a laboratory scale photoreactor for decolorization of the Reactive blue 19 (RB19) dye from synthetic textile wastewater. (scialert.net)
  • In new research funded by the company, Yoshikazu Kimura of Iharanikkei Chemical Industry Company, Masayuki Kirihara of Shizuoka Institute of Science & Technology, and coworkers, including at NLM, explored using sodium hypochlorite pentahydrate versus aqueous bleach in a variety of industrial oxidations. (acs.org)
  • Footnote 3 Footnote 4 In polluted waters, therefore, where the pH can be neutral or acidic, the potential for hydrogen sulphide formation is increased. (canada.ca)
  • The RB19 solution was completely decolorized under optimal hydrogen peroxide dosage of 2.5 mmol L -1 and low-pressure mercury UV-C lamps (55 w) in less than 30 min. (scialert.net)
  • It is a product of the anaerobic decomposition of sulphur-containing organic matter, and other sulphur compounds are nearly always present with the hydrogen sulphide in these natural occurrences. (canada.ca)
  • Many compounds are not allergenic themselves but are activated in the skin (e.g., metabolically) or before skin contact (e.g., via air oxidation) to form skin sensitizers. (cdc.gov)
  • The clinical importance of air oxidation to activate nonallergenic compounds has been demonstrated. (cdc.gov)
  • Canadian production of hydrogen sulphide by manufacturers of pigments and dye colours amounted to 10.7 tonnes in 1974. (canada.ca)
  • Hydrogen sulphide, which exists as a colourless gas under normal conditions, also occurs naturally in coal, natural gas, oil, volcanic gases and sulphur springs and lakes. (canada.ca)
  • Hydrogen peroxide prepared zein doughs were extensible and cohesive below zein's glass transition temperature. (edu.au)
  • Oxidants are usually chemical substances with elements in high oxidation states (e.g. (wikipedia.org)
  • Footnote 14 Hydrogen sulphide and other soluble sulphides are utilized in pigment and dye manufacturing, tanning and pulp and chemical processing. (canada.ca)
  • The Reactive Blue 19, also known as Remazol brilliant blue, is very resistant to chemical oxidation due to its aromatic anthraquinone structure highly stabilized by resonance. (scialert.net)
  • hydrogen sulphide concentrations increase with decreasing pH. (canada.ca)