PubMed Journals Articles About "Hydrogen Peroxide" RSS

22:59 EDT 16th October 2018 | BioPortfolio

Hydrogen Peroxide PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Hydrogen Peroxide articles that have been published worldwide.

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Showing "Hydrogen Peroxide" PubMed Articles 1–25 of 2,100+

Hydrogen peroxide extracellular concentration in the ventrolateral medulla and its increase in response to hypoxia in vitro: possible role of microglia.

Hydrogen peroxide (HO) is a messenger involved in both damaging neuroinflammatory responses and physiological cell communication. The ventrolateral medulla, which regulates several vital functions including breathing and blood pressure, is highly influenced by hydrogen peroxide, whose extracellular levels could be determined by hypoxia and microglial activity, both of which modulate ventrolateral medulla function. Therefore, in this study we aimed to test whether different patterns of hypoxia and/or putativ...

Resistive Analysis of Hydrogen Peroxide in one Axon of single Neuron with Nano-pipettes.

Electrochemical analysis of intracellular hydrogen peroxide in sub-micron scaled cellular protrusion is challenging that requires highly sensitive nanoelectrode and advanced electrochemical detection system. In this technical note, a resistive analysis based on acrylic acid polymerization in the nano-pipettes is established to measure hydrogen peroxide in one axon of single neuron. Upon the position of nano-pipette tip inside the axon, hydrogen peroxide is electrokinetically loaded into the pipette to react...

Effectiveness of and Dental Sensitivity to At-home Bleaching With 4% and 10% Hydrogen Peroxide: A Randomized, Triple-blind Clinical Trial.

To evaluate the risk for and intensity of tooth sensitivity and color change of at-home dental bleaching with 4% and 10% hydrogen peroxide (HP).

Clinical Evaluation of Different Delivery Methods of At-Home Bleaching Gels Composed of 10% Hydrogen Peroxide.

This study aimed to compare the tooth sensitivity, gingival irritation, and bleaching efficacy of at-home whitening performed with 10% hydrogen peroxide (HP) using a conventional tray-delivered system or two different bleaching systems (strips or prefilled disposable trays).

Chiral Calcium-Catalyzed Asymmetric Epoxidation Reactions Using Hydrogen Peroxide as the Terminal Oxidant.

Asymmetric epoxidation reactions of chalcone derivatives catalyzed by chiral calcium complexes using hydrogen peroxide were developed. The epoxidation reactions proceeded smoothly to afford the desired products in good yields with good enantioselectivities. This is the first example of chiral calcium-catalyzed asymmetric epoxidation reactions using hydrogen peroxide as the terminal oxidant.

Effectiveness of In-office Hydrogen Peroxide With Two Different Protocols: A Two-center Randomized Clinical Trial.

The aim of this study was to compare the bleaching efficacy and tooth sensitivity (TS) of a 38% hydrogen peroxide bleaching agent used for in-office bleaching, applied under different time protocols: a 40-minute application or two 20-minute applications.

Photocatalytic degradation of reactive black 5 on the surface of tin oxide microrods.

A simple co-precipitation technique is proposed for synthesis of tin oxide (SnO) microrods. Stannous chloride and urea were used during synthesis. X-ray powder diffraction (XRD) analysis revealed that the annealed product consists of SnO microrods having tetragonal unit cells, while scanning electron microscopy (SEM) analysis revealed the rod-like morphology of a synthesized product. These synthesized microrods are used as photocatalyst for the degradation of reactive black 5 (RB5). Degradation kinetics of ...

Blood hydrogen peroxide break-down activity in healthy subjects and in patients at risk of cardiovascular events.

Antioxidant status has been shown to be associated with cardiovascular events (CVEs). The aim of the study was to develop an assay measuring serum hydrogen peroxide (HO) break-down activity (HBA) of healthy subjects (HS) and to validate it in a cohort of patients with atrial fibrillation (AF).

Optimization of sugarcane bagasse pretreatment using alkaline hydrogen peroxide through ANN and ANFIS modelling.

The present study compares the optimization using Artificial Neural Networks (ANN) and Adaptive Network-based Fuzzy Inference System (ANFIS) in the sugarcane bagasse delignification process using Alkaline Hydrogen Peroxide (AHP). Two variables were assessed experimentally: temperature (25-45 °C) and hydrogen peroxide concentration (1.5-7.5%(w/v)). The Klason Method was used to measure the amount of insoluble lignin, the High Performance Liquid Chromatography (HPLC) was used to determine the glucose and x...

Hydrogen peroxide production via a redox reaction of N,N'-dimethyl-2,6-diaza-9,10-anthraquinonediium by addition of bisulfite.

We demonstrate that bisulfite can be used for reduction of a highly electrophilic anthraquinone derivative, N,N'-dimethyl-2,6-diaza-9,10-anthraquinonediium (DAAQ), and subsequent autoxidation generates an equivalent of hydrogen peroxide. The mechanism for DAAQ reduction by bisulfite, DAAQ electrochemistry, and use of a simple test strip assay for H2O2, are described.

Combined treatment of toxic cyanobacteria Microcystis aeruginosa with hydrogen peroxide and microcystin biodegradation agents results in quick toxin elimination.

Under some conditions the growth of toxic cyanobacteria must be controlled by treatment with algicidal compounds. Hydrogen peroxide has been proposed as an efficient and relatively safe chemical which can remove cyanobacteria from the environment selectively, without affecting other microorganisms. However, the uncontrolled release of secondary metabolites, including toxins may occur after such a treatment. Our proposal presented in this paper concerns fast biodegradation of microcystin released after cell ...

Effect of intraoperative local application of 3% hydrogen peroxide on pocket infections following cardiac implantable electronic device implantation: An observational study.

The aim of this study was to analyze whether local application of 3% hydrogen peroxide (H2O2) additionally to standard antibiotic prophylaxis following implantation of cardiac implantable electronic devices (CIED) reduces the incidence of pocket infections (PI).

Piperidylthiosemicarbazones Cu(II) complexes with a high anticancer activity by catalyzing hydrogen peroxide to degrade DNA and promote apoptosis.

Copper(II) complexes efficiently catalyze hydrogen peroxide to generate reactive oxygen species (ROS), which is the major reason for its significant anti-tumor activity. We synthesized three Cu(II) piperidylthiosemicarbazone complexes and examined their structures by X-ray single crystal diffraction. These Cu(II) complexes have significant apoptosis-promoting activity at nanomolar concentrations. The antitumor activity of these Cu(II) complexes is increased by more than 40-fold relative to that of the ligan...

Biocidal Efficacy of a Hydrogen Peroxide Lens Care Solution Incorporating a Novel Wetting Agent.

To compare the antimicrobial effects of CLEAR CARE, a 3% hydrogen peroxide (H2O2) solution formulated for simultaneous cleaning, daily protein removal, disinfection, and storage of soft (hydrophilic) hydrogel, silicone hydrogel, and gas-permeable contact lenses, and CLEAR CARE PLUS, consisting of the 3% H2O2 solution plus a novel wetting agent, polyoxyethylene-polyoxybutylene (EOBO-21).

Lycii fructus extract ameliorates hydrogen peroxide-induced cytotoxicity through indirect antioxidant action.

Lycii Fructus is the dried ripe fruits of Lycium chinense and L. barbarum, which has long been used as a traditional food material in East Asia. The purpose of this study was to investigate the role of the indirect antioxidative action in the Lycii fructus extract (LFE)-induced cytoprotective effect in vitro. LFE significantly enhanced the expression of the drug-metabolizing enzyme genes and intracellular glutathione level in mouse hepatoma Hepa1c1c7 cells. LFE stimulated the nuclear translocation of aryl h...

An Organodiselenide with Dual Mimic Function of Sulfhydryl Oxidases and Glutathione Peroxidases: Aerial Oxidation of Organothiols to Organodisulfides.

A novel organodiselenide, which mimics sulfhydryl oxidases and glutathione peroxidase (GPx) enzymes for oxidation of thiols by oxygen and hydrogen peroxide, respectively, into disulfides has been presented. The developed catalyst oxidizes an array of organothiols into respective disulfides in practical yields by using aerial O to avoid any reagents/additives, base, and light source. The synthesized diselenide also catalyzes the reduction of hydrogen peroxide into water by following the GPx enzymatic catalyt...

The Rise of Hydrogen Peroxide as the Main Product by Metal-Free Catalysis in Oxygen Reductions.

One of the recent trends in electrocatalytic reactions involves the oxygen reduction reaction (ORR), where a new paradigm has been shaped to exploit this reaction for the synthesis of hydrogen peroxide (H O ). H O is a very versatile chemical of high commercial value, prepared currently through poorly sustainable processes. The emergence of metal-free carbon catalysts for the selective synthesis of H O is expected to revolutionize ORR research, beckoning at the development of new industrial schemes. The com...

Protective effects and mechanisms of Terminalia catappa L. methenolic extract on hydrogen-peroxide-induced oxidative stress in human skin fibroblasts.

Oxidative stress plays a crucial role in aging-related phenomenon, including skin aging and photoaging. This study investigated the protective role and possible mechanism of Terminalia catappa L. methanolic extract (TCE) in human fibroblasts (Hs68) against hydrogen peroxide (HO)-induced oxidative damage.

Use of by-products from integrated steel plants as catalysts for the removal of trichloroethylene from groundwater.

The removal of tricholoroethylene (TCE) has been investigated in this work through the Fenton-like process using different catalytic materials obtained from metallic by-products of the steel industry. These materials are the slag produced during the transformation of molten pig iron produced in a blast furnace into liquid steel (SLD), the dry particles (or dust) obtained from the bag filters installed in the coking installations to minimize diffuse emissions (POCA) and the dry particles obtained from the li...

Antimicrobial effect of different peroxyacetic acid and hydrogen peroxide formats against spores of Clostridium estertheticum.

"Blown pack" spoilage is primarily caused by Clostridium estertheticum. The primary source of contamination is probably pelts, faeces and soil during opening cuts and de-hiding. Peroxyacetic acid (POAA) based fogs are commonly included in an abattoir's routine cleaning process. Hydrogen peroxide (HO) is a powerful oxidizing agent that penetrates microbe cell walls causing cell death. In this study, we compared the ability of HO and OXYSAN ZS (POAA containing 1-hydroxyethylidine-1,1-diphosphonic acid as a st...

Exogenous Melatonin Confers Cadmium Tolerance by Counterbalancing the Hydrogen Peroxide Homeostasis in Wheat Seedlings.

Melatonin has emerged as a research highlight regarding its important role in regulating plant growth and the adaptation to the environmental stresses. In this study, we investigated how melatonin prevented the cadmium toxicity to wheat seedlings. The results demonstrated that cadmium induced the expression of melatonin biosynthesis-related genes and cause a significant increase of endogenous melatonin level. Melatonin treatment drastically alleviated the cadmium toxicity, resulting in increased plant heigh...

Hydrogen peroxide head preparation: enabling cuttings and anatomical studies of the skull base dura mater and arachnoid without the use of drilling.

Anatomical pieces that are preserved using formaldehyde allow us to undertake high-quality skull base studies. However, extensive drilling is often necessary, which can lead to damages to the dura mater and thus arachnoid. Formaldehyde and hydrogen peroxide can soften the bone which in turn, can be easily cut with a scalpel or removed with a curette. After having discovered this technique by chance, our aim was to establish a study protocol of the skull base dura mater without the use of the drill. 10 heads...

Titanium granules pre-treated with hydrogen peroxide inhibit growth of bacteria associated with post-operative infections in spine surgery.

Post-operative infections are relatively common after posterior spine surgery, and there are several observations reflecting different infection complications related to various metals implanted. Here, we selected an array of different bacterial species that are often found in infections associated with orthopaedic implants and tested for inhibition by hydrogen peroxide-treated titanium (Ti-peroxy).

Methionine oxidation by hydrogen peroxide in peptides and proteins: A theoretical and Raman spectroscopy study.

The oxidation of proteins results in their deterioration via the oxidation of reactive amino acids. Oxidation of the amino acid, methionine plays an important role during biological conditions of oxidative stress, and equally a role in protein stability. In this study the oxidation of the methionine residue using the tripeptide GlyMetGly with respect to hydrogen peroxide has been studied using both Raman spectroscopy and DFT calculations. Spectral modifications following the formation of methionine sulfoxid...

3D mesoporous CuFeO as a catalyst for photo-Fenton removal of sulfonamide antibiotics at near neutral pH.

Increasing the amount of surface active sites of the material may be a feasible way to improve the efficiency ofthe generation of Fe in the photo-Fenton process. In this work, a simple synthesis method was adopted to synthesize 3D ordered mesoporous CuFeO with large specific surface areaby using ferric nitrate and copper nitrate as the precursor and KIT-6 as the template. The synthesized materials were characterized by nitrogen adsorption-desorption, XRD, TEM, FT-IR and UV-vis DRS. The catalytic properties ...

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