anionic dbs surfactant can be photodegraded in a tio2 dispersion and h2o2 solution under an hg-lamp (15 w) uv illumination or solar exposure. degradation process has been monitored through cleavage of aromatic moiety. degradation of the detergent was small when the photolysis was carried out in the absence of tio2 and h2o2 and it was negligible in the absence of light. most of the curves repres...

BACKGROUND H2O2 produced by vaginal lactobacilli is believed to protect against infection, and H2O2-producing lactobacilli inactivate pathogens in vitro in protein-free salt solution. However, cervicovaginal fluid (CVF) and semen have significant H2O2-blocking activity. METHODS We measured the H2O2 concentration of CVF and the H2O2-blocking activity of CVF and semen using fluorescence and in ...

The classical method to determine hydrogen peroxide (H2O2) scavenging activity of plant extracts is evaluated by measuring the disappearance of H2O2 at a wavelength of 230 nm. Since this method suffers from the interference of phenolics having strong absorption in the UV region, a simple and rapid colorimetric assay was developed where plant extracts are introduced to H2O2, phenol and 4-aminoan...

The effects of H2O2 were evaluated in the estuarine worm Laeonereis acuta (Polychaeta, Nereididae) collected at the Patos Lagoon estuary (Southern Brazil) and maintained in the laboratory under controlled salinity (10 psu diluted seawater) and temperature (20 degrees C). The worms were exposed to H2O2 (10 and 50 microM) for 4, 7, and 10 days and the following variables were determined: oxygen c...

—The effect of water temperature on the efficacy of hydrogen peroxide (H2O2) as a disinfectant for channel catfish Ictalurus punctatus eggs was examined at 248C and 288C. Eggs at each temperature were treated with H2O2 at 0, 100, 250, 500, or 1,000 mg/L as a daily 15-min bath. Mean hatching success at 248C was greatest (P . 0.05) for eggs treated with 250 and 500 mg/L H2O2, hatching success ten...

Objective: Echium amoenum Fisch. & C.A. Mey. is used for the treatment of various diseases in traditional medicine. This plant is a major source of anthocyanins with beneficial cardiovascular properties such as anti-atherosclerotic and antihypertensive effects. In the present study, the protective and antioxidant effects of anthocyanin-rich E. amoenum extract were evaluated on human vascular en...

In this work, the effect of Fenton's reagent on the degradation of residual Kraft black liquor was investigated. The effect of Fenton's reagent on the black liquor degradation was dependent on the concentration of H2O2. At low concentrations (5 and 15 mM) of H2O2, Fenton's reagent caused the degradation of phenolic groups (6.8 and 44.8%, respectively), the reduction of reaction medium pH (18.2%...

Citation: Hopwood MJ, Riebesell U, Arístegui J, Ludwig A, Achterberg EP and Hernández N (2018) Photochemical vs. Bacterial Control of H2O2 Concentration Across a pCO2 Gradient Mesocosm Experiment in the Subtropical North Atlantic. Front. Mar. Sci. 5:105. doi: 10.3389/fmars.2018.00105 Photochemical vs. Bacterial Control of H2O2 Concentration Across a pCO2 Gradient Mesocosm Experiment in the Subt...

abstract kinetic properties of root of peroxidase of gundelia tournefortii investigated at different ph, temperature and different inhibitors. maximum activity of peroxidase achieved at ph 5.5-6 in according to type of substrate. activity of peroxidase increased at constant concentration of h2o2 and different concentration of guaiacol, catechol and pyrogallol. the maximum activity in presence o...

Hydrogen peroxide (H2O2) is a signal molecule which mediates a wide range of physiological and biochemical reactions during the whole period of plant growth. We studied the effects of various concentrations of exogenous hydrogen peroxide as well as a hydrogen peroxide scavenger, ascorbic acid (AsA) on the growth and development of adventitious roots and leaves of sweet potato seedlings. In cult...