This can be attributed to the reduction of hydroxyl radicals
' level due to the fact that under alkaline conditions hydrogen peroxide decomposes into water and oxygen rather than hydroxyl radicals
Antioxidant activity means that some antioxidants can protect cells against the damage of reactive oxygen species , such as superoxide, singlet oxygen, and hydroxyl radicals
. Thus, research and exploring potent natural compounds with antioxidant activities and low cytotoxicity from plants have become very important in the field of biomedicine.
In principle it was observed that Fe +2 ions are controlling the production of hydroxyl radicals
which act as an active oxidant.
Meanwhile, the GSHPx, regarded as a selenium-containing enzyme against ROS, could directly react with ROS on preventing the formation of [H.sub.2][O.sub.2]-induced hydroxyl radicals
However, when the pH was 9.2, the DPPH and hydroxyl radical
antioxidant activity of MPHs declined sharply, exhibiting reductions of 90% and 16%, respectively, compared with that under the pH of 2.2.
Then, they react with hydroxyl radicals
and ozone, producing more hydroxyl radicals
The main interest of this paper is to choose a semi-empirical mathematical model for description of the molecular adsorption for some organic pollutants in solution over Ti[O.sub.2]-P25 particles, and find the theoretical relation between the adsorption process and the heterogeneous photocatalytic mechanism based on hydroxyl radical
scavenging activity: For the detection of hydroxyl radical
scavenging activity the reaction mixture was contained of 0.15 mM FeSO4-EDTA 6 mM H2O2 2 mM sodium salicylate and sample solutions containing 0.20.4 0.6 0.8 and 1.0 mg mL-1 EPS in sodium phosphate buffer (150 mM pH 7.4).
Current work provided certain clues for evaluating the contribution impacts of functional groups of flavonoids on antiplatelet aggregation and free hydroxyl radical
scavenging which might also help in selecting effective and favorable dietary flavonoid drugs in the prevention and treatment of related diseases.
Chemically available iron can mix with hydrogen peroxide, another noxious scrap of power production, to create hydroxyl radicals
, a potent reactive oxygen species.
Although superoxide anion production is essential for bacterial cell killing, the subsequent release of hydrogen peroxide and other additional reactions produces more dangerous ROS, including singlet oxygen and the hydroxyl radical
.Although not a free radial, singlet oxygen can be formed in some radical reactions and can also lead to others since it is one of the most active intermediates involved in biochemical reactions.
We propose that bisphenol A causes generation of hydroxyl radical
causing peroxidation of lipids.