BACKGROUND Acid electrolyzed water (AEW), which is produced through the electrolysis of dilute sodium chloride (NaCl) or potassium chloride solution, is used as a disinfectant in various fields because of its potent antimicrobial activity. The hydroxyl radical, an oxygen radical species, is often suggested as a putative active ingredient for AEW antimicrobial activity. METHODOLOGY/PRINCIPAL F...

To break the bottlenecks of slow hydrolysis and low acid production efficiency waste-activated sludge (WAS) in traditional anaerobic fermentation process, this study investigated employment ferrous-iron (Fe(II))-activated sulfite to produce hydroxyl, sulfate, other highly oxidizing radicals on WAS floc cracking short-chain fatty (SCFAs) during fermentation. The effect dosage ratio Fe(II)/S(IV) ...

In this study, chalcopyrite (CuFeS2), a natural mineral with bimetallic structure, was used as the activator to generate radicals for removing organic pollutants from aqueous solutions via activation of peroxymonosulfate (PMS). Sulfisoxazole (SIX), sulfonamide antibiotic, selected model pollutant. The results showed that highly reactive toward PMS; under conditions 50 µM PMS and 1 g/L chalcopyr...

Potassium monopersulfate has been decomposed in aqueous solution in the presence of Co(II). The effect of the main operating variables has been assessed. Minimum variations in pH exert a considerable influence on the process kinetics. Thus, when no pH adjustment is considered, the actual effect of variables like initial monopersulfate and/or catalyst concentration may be hindered. As expected, ...

In this study, sulfated low molecular-weight Tremella fuciformis polysaccharides (SLTP) with different sulfate contents were synthesized and their antioxidant activities, including superoxide anion radical, 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical and hydroxyl radical scavenging activities were investigated. The results indicated that, compared to natural Tremella fuciformis polysaccharide...

Abstract In this study, zero-valent iron (ZVI) is applied to activate persulfate (PDS) for the degradation of amaranth (AMR). The effects PDS concentration, ZVI solution pH , temperature, and reaction time on AMR by ZVI/PDS advance oxidation process are investigated. Sulfate hydroxyl radicals involved in main pathway sulfate radical acts as a dominant oxidant. CCD (central composite design) pla...

Free radicals can cause various kinds of degenerative diseases and skin aging. be neutralized with an enzymatic antioxidant, namely superoxide dismutase (SOD). One the plants that has high SOD activity is salam (Syzygium polyanthum). The aim this study was to determine crude extract bay leaves precipitated ammonium sulfate salt at concentrations 25, 50, 75%. began plant determination, enzyme ex...

apoptosis, a physiologic mechanism to eliminate unwanted cells, is also induced by ionizing irradiation, through production of free radicals. it has been demonstrated that antioxidants such as vitamin e are able to protect cells from damage caused by free radicals. taken together we found it reasonable to make an attempt to evaluate the protective effect of vitamin e against apoptosis. the irra...