Topic
Hydrogen peroxide
About: Hydrogen peroxide is a research topic. Over the lifetime, 42583 publications have been published within this topic receiving 1043732 citations. The topic is also known as: H2O2 & dioxidane.
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TL;DR: Hydrogen peroxide interrupts the Calvin cycle at the transketolase step, leading to a reduced supply of the CO2-acceptor ribulose 1,5-diphosphate.
184 citations
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TL;DR: In this paper, the degradation of the pesticide precursor 4-chlorobenzoic acid (4-CBA) in water was investigated using different TiO 2 powders and near-UV radiation.
Abstract: Assisted-photocatalytic degradation of the pesticide precursor 4-chlorobenzoic acid (4-CBA) in water was investigated using different TiO 2 powders and near-UV radiation. Experiments were performed at pH=3.0 and at different TiO 2 loadings, solution ionic strengths, and concentrations of hydrogen peroxide as an oxidant additive. Dark adsorption equilibrium studies revealed that surface area, ionic strength, and catalyst heterogeneity influenced the adsorption capacity and adsorption mechanism. This was attributed to the type and concentration of adsorption sites and the electrostatic interactions in the solution-semiconductor interface. However, the rates of the photocatalytic reactions were not significantly affected by an increase in the ionic strength by a factor of 50. On the other hand, the reaction rate was a strong function of catalyst crystallinity and loading. This suggested that the reactions were mostly controlled by the rate of formation of the oxidizing species rather than the extent of electric double layer (EDL) compression. Addition of hydrogen peroxide up to 248 mg/l resulted in an increase of the reaction rates with a corresponding increase in photonic efficiency by ≈20%. Above this concentration, hydrogen peroxide either did not enhance or caused a significant inhibition of the mineralization rates.
184 citations
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TL;DR: The results indicate that even dilute concentrations of solvents, including H202, can increase the reactivity of O2- in water, probably by changing its solvation sphere.
Abstract: The reactive oxygen species responsible for the transformation of carbon tetrachloride (tetrachloromethane, CT) by modified Fenton's reagent using hydrogen peroxide (H2O2) concentrations >0.1 M was investigated. Addition of the hydroxyl radical scavenger 2-propanol to modified Fenton's reactions did not significantly lower CT transformation rates. Scavenging by 2-propanol not only confirmed that hydroxyl radicals are not responsible for CT destruction, but also suggested that a major product of an iron (III)-driven initiation reaction, superoxide radical anion (O2•-), is the species responsible for CT transformation. To investigate this hypothesis, CT degradation was studied in aqueous KO2 reactions. Minimal CT degradation was found in CT−KO2 reactions; however, when H2O2 was added to the KO2 reactions at concentrations similar to those in the modified Fenton's reactions (0.1, 0.5, and 1 M), CT degradation increased significantly. Similar results were obtained when 1 M concentrations of other solvents wer...
184 citations
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TL;DR: The results demonstrated that mango peel extracts protected erythrocytes against oxidative stress and may impart health benefits and it could be used as a valuable food ingredient or a nutraceutical product.
184 citations
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TL;DR: Human A549 lung epithelial cells were challenged with 18O-labeled hydrogen peroxide and showed slow turnover rates of adducts in RNA and DNA, where guanine in RNA was 14–25 times more common than in DNA.
Abstract: Human A549 lung epithelial cells were challenged with 18O-labeled hydrogen peroxide ([18O]-H2O2), the total RNA and DNA extracted in parallel, and analyzed for 18O-labeled 8-oxo-7,8-dihydroguanosine ([18O]-8-oxoGuo) and 8-oxo-7,8-dihydro-2'-deoxyguanosine ([18O]-8-oxodGuo) respectively, using high-performance liquid chromatography electrospray ionization tandem mass spectrometry (HPLC-MS/MS). [18O]-H2O2 exposure resulted in dose-response formation of both [18O]-8-oxoGuo and [18O]-8-oxodGuo and 18O-labeling of guanine in RNA was 14-25 times more common than in DNA. Kinetics of formation and subsequent removal of oxidized nucleic acids adducts were also monitored up to 24 h. The A549 showed slow turnover rates of adducts in RNA and DNA giving half-lives of approximately 12.5 h for [18O]-8-oxoGuo in RNA and 20.7 h for [18O]-8-oxodGuo in DNA, respectively.
184 citations