PubMed Journals Articles About "Hydrogen Peroxide" RSS

03:44 EST 20th January 2019 | 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+

Effectiveness of Dental Bleaching With 37.5% and 6% Hydrogen Peroxide and Its Effect on Quality of Life.

This study investigated whether it is possible to achieve equally satisfactory results between 37.5% hydrogen peroxide (HP) gel and 6% HP gel. We also assessed the psychosocial impact and self-perception of esthetics generated by extracoronal tooth whitening.

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...

In vitro effects of hydrogen peroxide on rat uterine contraction before and during pregnancy.

To assess the in vitro effect of hydrogen peroxide (H2O2) on uterine contractions in pregnant and non-pregnant rats.

Impedimetric mechanism study of horseradish peroxidase at low and high concentrations of hydrogen peroxide based on graphene/sol-gel/horseradish peroxidase.

A novel electrochemical modified electrode for the impedimetric mechanism study of horseradish peroxidase and hydrogen peroxide was proposed based on immobilizing horseradish peroxidase/3‑(trimethoxysilyl) propylamine/graphene on glassy carbon electrode (HRP/TMSPA/Gr/GCE). Cyclic voltammetry and SEM were utilized to corroborate the successful stepwise assemblage procedure of the electrode. The electrochemical impedance spectroscopy measurements revealed that the charge transfer resistance increases at low...

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.

Multienzymatic in situ hydrogen peroxide generation cascade for peroxygenase-catalysed oxyfunctionalisation reactions.

There is an increasing interest in the application of peroxygenases in biocatalysis, because of their ability to catalyse the oxyfunctionalisation reaction in a stereoselective fashion and with high catalytic efficiencies, while using hydrogen peroxide or organic peroxides as oxidant. However, enzymes belonging to this class exhibit a very low stability in the presence of peroxides. With the aim of bypassing this fast and irreversible inactivation, we study the use of a gradual supply of hydrogen peroxide t...

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 ...

Hydrogen peroxide stimulates uropathogenic Escherichia coli strains to cellulose production.

Reactive oxygen intermediates, such as hydrogen peroxide, are toxic molecules produced by immune cells in response to bacterial invasion into the host. Bacteria try to protect themselves against the immune system through specific properties such as biofilm formation. This phenomenon occurs also during urinary tract infections. Cellulose is an important factor of Escherichia coli biofilm and contributes to building a protective shield around bacterial cells upon the host immune response. In this study, we ai...

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...

Surface damage of dental implant systems and ions release after exposure to fluoride and hydrogen peroxide.

The aim of this study was to evaluate surface changes on dental implant systems and ions release after immersion in fluoride and hydrogen peroxide.

Stabilization and Controlled Release of Microencasulated Hydrogen Peroxide for Wound Treatment Applications.

Hydrogen peroxide (H O ) disinfection applications are limited by its rapid inactivation. The aims of this study were to 1) microencapsulate H O in silica hydrogels to obtain controlled release up to 72 hours, 2) test hydrogel antimicrobial activity against four common pathogens, and 3) assess H O release kinetics and antimicrobial activity in 35 - 65% relative humidity and 37°C to approximate bandaged wound conditions.

Anatomic Site-Specific Treatment Response With 40% Hydrogen Peroxide (w/w) Topical Formulation for Raised Seborrheic Keratoses: Pooled Analysis of Data from Two Phase 3 Studies.

Seborrheic keratoses (SKs) may present in any non-glabrous skin, but data are limited on the response to treatment as based on the SK location. We aimed to understand the relationship between SK location and clearance with up to 2 treatments of 40% (w/w) hydrogen peroxide topical solution (HP40).

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.

Epigallocatechin Gallate Is the Most Effective Catechin Against Antioxidant Stress via Hydrogen Peroxide and Radical Scavenging Activity.

BACKGROUND Hydrogen peroxide-induced neuronal oxidative stress is a serious threat to the nervous system. Catechins and related compounds are effective radical scavengers that protect against nerve cell damage. MATERIAL AND METHODS Here, we investigated the antioxidant property of various catechins in protecting against hydrogen peroxide, as well as their radical-scavenging activity. RESULTS We found that catechins treatment effectively protected HT22 cells against H₂O₂-induced cell viability by decreas...

Hydrogen Peroxide Enhances the Antibacterial Effect of Methylene Blue-based Photodynamic Therapy on Biofilm-forming Bacteria.

Recently, increased attention has been focused on endoscopic disinfection after outbreaks of drug resistant infections associated with gastrointestinal endoscopy. The aims of this study were to investigate the bactericidal efficacy of methylene blue (MB)-based photodynamic therapy (PDT) on Pseudomonas aeruginosa (P. aeruginosa), which is the major cause of drug resistant post-endoscopy outbreak, and to assess the synergistic effects of hydrogen peroxide addition to MB-based PDT on biofilms. In planktonic st...

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).

Manganese-Catalyzed Asymmetric Oxidation of Methylene C-H of Spirocyclic Oxindoles and Dihydroquinolinones with Hydrogen Peroxide.

A highly efficient strategy for the enantioselective oxidation of methylene C-H of spirocyclic oxindoles and dihydroquinolinones has been established, in which an earth-abundant manganese catalyst and hydrogen peroxide are used. Noteworthy, the manganese catalyst can be applied to the asymmetric hydroxylation of spirocyclic 2,3-dihydroquinolin-4-ones with 94-99% ee.

Degradation of dimethyl phthalate using a liquid phase plasma process with TiO photocatalysts.

The liquid phase plasma (LPP) method with a TiO photocatalyst and hydrogen peroxide was used to decompose dimethyl phthalate (DMP). As the applied voltage, pulse width, and frequency were increased, the rate of decomposition was increased and the decomposition rate was 63% for 180 min under plasma optimum conditions. The addition of TiO photocatalyst and hydrogen peroxide increased the DMP decomposition reaction rate, but an excess cause a decrease in decomposition rate due to a decrease in conductivity, ...

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...

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