Evaluation Of Hydrogen Peroxide Research Articles

Synthesis and characterization of naphthalene-sulfonate hybrid structures and their effects on abiotic stress indicators in maize

As a result of global warming and environmental pollution resulting from human activities such as industrialization, CO2 emissions, and mining, plants are exposed to more and more abiotic stress types day by day. As a natural consequence of this situation, yield losses and economic problems occur in agricultural plants. To contribute to the solution of these problems, firstly, ıt was present a simple synthetic strategy involving naphthalene-sulfonate hybrid derivatives mediated by triethylamine. It successfully obtained a sequence of four designed molecules. Biologıcal evaluation of hydrogen peroxide (H2O2) and thiobarbituric acid-reactive substances (TBARS) levels were measured in maize seedlings under abiotic stress for naphthalene-sulfonate hybrid constructions. It was observed that the 3a, 3b, 3c, and 3d derivatives reached the lowest H2O2 content at 0.5 mM, 0.75 mM, 0.25, and 0.25 mM concentrations, respectively. For all 3a, 3b, 3c, and 3d derivatives, the TBARS content was the lowest at concentrations between 0.25 mM and 0.5 mM, and there was no statistical difference between the two pre-treatments. In light of the findings, it was observed that all of the 3a, 3b, 3c, and 3d derivatives were effective at different levels in alleviating the adverse effects of abiotic stresses on plants. However, 0.25 mM concentration of the 3c derivative was determined to be the most effective in reducing both H2O2 and TBARS levels in maize seedlings under stress.

Evaluation of hydrogen peroxide and ozone residue levels on N95 masks following chemical decontamination

BackgroundHydrogen peroxide and ozone have been used as chemical decontamination agents for N95 masks during supply shortages. If left behind on the masks, the residues of both chemicals represent a potential health hazard by skin contact and respiratory exposure.AimCharacterization of hydrogen peroxide and ozone residues on mask surfaces after chemical decontamination.MethodsVarious N95 masks were decontaminated using two commercial systems employing either aerosol spray or vaporization of hydrogen peroxide in the presence of ozone. Following the decontamination, the masks were aired out to eliminate moisture and potential chemical residues. The residual hydrogen peroxide and ozone were monitored in the gas phase above the mask surface, and hydrogen peroxide residue directly on mask surfaces using a colorimetric assay.FindingsAfter decontamination, hydrogen peroxide and ozone were detectable in the gas phase in the vicinity of masks even after 5 h of aeration. Hydrogen peroxide was also detected on all studied masks, and levels up to 56 mg per mask were observed after 0.5 h of aeration. All residues gradually decreased with aeration, likely due to decomposition and vaporization.ConclusionHydrogen peroxide and ozone were present on N95 masks after decontamination. With appropriate aeration, the gaseous residue levels in the vicinity of the masks decreased to permissible levels as defined by the US Occupational Safety and Health Administration. Reliable assays to monitor these residues are necessary to ensure the safety of the mask users.

Evaluation of Hydrogen Peroxide and Cetylpyridinium Chloride as Bacterial Decontaminants of Dental Unit Water Lines at a Private Peruvian Dental School.

ABSTRACTAim:The aim of this study was to evaluate the hydrogen peroxide and cetylpyridinium chloride as bacterial decontaminants of dental unit water lines at a private Peruvian dental school.Materials and Methods:Water samples were obtained from 66 dental units of a University Dental Clinic before decontamination treatment and at days 3 and 7 thereafter. The biofilm treatments were applied equitably among the two treatment groups (n = 22) and one negative control (distilled water). The samples obtained on each collection day were taken to the biochemical laboratory in thermal boxes and then diluted, seeded, and incubated at 37°C for 24h to count colony forming units per milliliter (CFU/mL).Results:The samples to which hydrogen peroxide were applied had a mean of 1.53 × 105 CFU/mL before application, 0.04 × 105 CFU/mL at day 3, and 0.03 × 105 CFU/mL at day 7, whereas the samples undergoing cetylpyridinium chloride treatment had a mean of 1.74 × 105 CFU/mL before application, 615.38 CFU/mL on day 3, and 307.69 CFU/mL on day 7. Distilled water treatment showed a mean of 1.72 × 105 ± 0.39 × 105 CFU/mL at baseline, 1.51 × 105 ± 1.40 × 105 CFU/mL at day 3, and a mean of 1.74 × 105 ± 0.47 × 105 CFU/mL at day 7. Statistically significant differences were found among the three treatment groups at days 3 (P ≤ 0.001) and 7 (P ≤ 0.001) but not at baseline (P = 0.306).Conclusions:The antibacterial effect of cetylpyridinium chloride was significantly greater than that of hydrogen peroxide and distilled water, and can, therefore, be used for bacterial control in the water lines of dental units.

Evaluation of Hydrogen Peroxide and Temperature to Control Mortality Caused by Saprolegniasis and to Increase Hatching Success of Largemouth Bass Eggs

AbstractWe evaluated the use of hydrogen peroxide (H2O2), temperature, or both, to control mortality presumptively caused by fungus Saprolegnia in Florida largemouth bass Micropterus salmoides floridanus eggs in a flow‐through hatchery system. Four treatments—ambient water (AW; control), ambient water and H2O2 (AWHP), heated water (HW), and both heated water and H2O2 (HWHP)—were tested on each of 30 replicate spawns. Four 8 cm × 5 cm sections of spawning mat, one for each treatment, were cut from each of the 30 selected spawns. Egg counts on each cut mat section were recorded. Water temperature in all AW and HW trial tanks ranged from 17.9°C to 19.2°C and from 22.1°C to 23.6°C, respectively, during treatment. The water temperature difference between treatments averaged 4.4°C. Hydrogen peroxide trial tanks received two, 100 mg/L H2O2 treatments 8 h apart, until hatch. The 7.5 L/min incoming water flow was not reduced during treatment. The addition of HW, H2O2, or both, significantly increased mean percent hatch (79, 79, and 91%, respectively) over that of the untreated controls (49%). Significant differences were found in mean percent hatch levels between AW and the other three treatment groups (P < 0.05). The combination of higher incubation temperature and H2O2 administration also resulted in significantly greater hatch than did either higher incubation temperature or increased H2O2 administration alone; percent hatch did not differ significantly between eggs that either were only incubated at the higher temperature or received only H2O2 administration. Increasing incubation water temperature to 22–23°C instead of using only water at ambient temperature (18–19°C) or adding 100 mg/L H2O2 twice daily in a flow‐through system significantly increased hatching percentage of Florida largemouth bass eggs.

Evaluation of Hydrogen Peroxide on Chemical Mechanical Polishing of Amorphous GST

As chemical mechanical polishing (CMP) becomes an essential step for fabrication phase change memory (PCM) device, industry always concerns that aggressive chemical components in the slurry might affect the composition and reliability of the phase change material Ge2Sb2Te5 (GST). In this study, we evaluated typical slurry component hydrogen peroxide on amorphous GST CMP. Silica-based slurries without H2O2 and with H2O2 at low (0.5wt%) and high concentrations (5wt%) were used for investigation. First, the polishing performance was compared. Then, auger electron spectroscopy (AES) was adopted to analyze the depth profile of Ge, Sb, Te and O for GST samples processed by different concentrations' H2O2. We also evaluated the phase change properties as a function of ageing time for those samples. To further evaluate the effect of H2O2 induced surface oxidation layer on PCM device, thermal simulation was used to compare the difference of thermal consumption and distribution during the operation.

ChemInform Abstract: Chemomechanical Polishing of Gallium Arsenide to Subnanometre Surface Finish. An Evaluation of Hydrogen Peroxide and Dibromine as Reagents.

Hydrogen peroxide is an effective chemical polish for gallium arsenide in the pH range 6–8.5. The polished gallium arsenide surface has a surface roughness of < 1 nm and is superior to that obtained from polishing with dibromine–methanol solutions.

Evaluation of Hydrogen Peroxide as an Intraprocedural Hemostatic Agent in Manual Dermabrasion

Evaluation of Hydrogen Peroxide as an Intraprocedural Hemostatic Agent in Manual Dermabrasion

Assessing the Effects of Increasing Hydrogen Peroxide Dosage on Rainbow Trout Gills Utilizing a Digitized Scoring Methodology

There is great interest in the potential use of hydrogen peroxide as a treatment for external diseases of fish, particularly bacterial gill disease. One important consideration in the evaluation of hydrogen peroxide as a disease treatment is target animal safety. The goal of this study was to document the pathological lesions of rainbow trout Oncorhynchus mykiss associated with hydrogen peroxide exposure. A digitized scoring method was developed to quantify the lesions on the target organ (i.e., gills). The index was a good indicator of the toxicity of hydrogen peroxide to juvenile rainbow trout and of the severity of the gill lesions. Increasing values of the index were observed with increasing doses of hydrogen peroxide. Most importantly, the index documented that fish surviving treatment with hydrogen peroxide recovered from the gill lesions it inflicted.

Chemomechanical polishing of gallium arsenide to subnanometre surface finish. An evaluation of hydrogen peroxide and dibromine as reagents

Hydrogen peroxide is an effective chemical polish for gallium arsenide in the pH range 6–8.5. The polished gallium arsenide surface has a surface roughness of < 1 nm and is superior to that obtained from polishing with dibromine–methanol solutions.

The evaluation of hydrogen peroxide

The evaluation of hydrogen peroxide