Increase In Peroxide Concentration Research Articles

Thioctic acid and dihydrolipoic acid are novel antioxidants which interact with reactive oxygen species.

Thioctic acid (TA) and its reduced form dihydrolipoic acid (DHLA) have recently gained some recognition as useful biological antioxidants. In particular, the ability of DHLA to inhibit lipid peroxidation has been reported. In the present study, the effects of TA and DHLA on reactive oxygen species (ROS) generated in the aqueous phase have been investigated. Xanthine plus xanthine oxidase-generated superoxide radicals (O2-), detected by electron spin resonance spectroscopy (ESR) using DMPO as a spin trap, were eliminated by DHLA but not by TA. The sulfhydryl content of DHLA, measured using Ellman's reagent decreased subsequent to the incubation with xanthine plus xanthine oxidase confirming the interaction between DHLA and O2-. An increase of hydrogen peroxide concentration accompanied the reaction between DHLA and O2-, suggesting the reduction of O2- by DHLA. Competition of O2- with epinephrine allowed us to estimate a second order kinetic constant of the reaction between O2- and DHLA, which was found to be a 3.3 x 10(5) M-1 s-1. On the other hand, the DMPO signal of hydroxyl radicals (HO.) generated by Fenton's reagent were eliminated by both TA and DHLA. Inhibition of the Fenton reaction by TA was confirmed by a chemiluminescence measurement using luminol as a probe for HO.. There was no electron transfer from Fe2+ to TA or from DHLA to Fe3+ detected by measuring the Fe(2+)-phenanthroline complex. DHLA did not potentiate the DMPO signal of HO. indicating no prooxidant activity of DHLA. These results suggest that both TA and DHLA possess antioxidant properties. In particular, DHLA is very effective as shown by its dual capability by eliminating both O2- and HO..

Direct photolysis of acetyl benzoyl peroxide and benzoyl peroxide

The quantum yields were found for the photodissociation of the O-O bond for acyl peroxides (0.12–0.14). In the framework of our assumptions, the increase in ϕ with increasing peroxide concentration may be related to conversion of the triplet excimer.

Destruction of Halogenated Aliphatics by Ultraviolet Catalyzed Oxidation with Hydrogen Peroxide

Hazardous compounds are often present in water at low concentration levels, which can make their removal difficult and costly by conventional treatment processes. This project investigated the destruction of hazardous compounds in water by ultraviolet catalyzed oxidation using hydrogen peroxide as the oxidizing agent. The effectiveness of this process was determined for typical halogenated aliphatics, including trichloroethylene, tetrachloroethylene, tetrachloroethane, dichloromethane, chloroform, carbon tetrachloride and ethylene dibromide. The reactions were conducted in a batch reactor equipped with a low pressure ultraviolet lamp. The rates of decomposition increased with increasing hydrogen peroxide concentration and temperature, and were highly dependent on chemical structure. With trichloroethylene, for example, the concentration was reduced from 50 ppm to less than 1 ppm in 50 min at 20°C and in 10 min. at 40°C. All of the reacted chlorine was converted to chloride ion, indicating that the chlorinated structures were destroyed by UV catalyzed oxidation.

Mechanical properties and morphology of crosslinked PP/PE blends and PP/PE/propylene–ethylene copolymer blends

AbstractBlending is an effective method for improving polymer properties. However, the problem of phase separation often occurs due to incompatibility of homopolymers, which deteriorates the physical properties of polyblends. In this study, isotactic polypropylene was blended with low‐density polyethylene. Crosslinking agent and copolymers of propylene and ethylene (either random copolymer or block copolymer) were added to improve the interfacial adhesion of PP/LDPE blends. The tensile strength, heat deflection temperature, and impact strength of these modified PP/PE blends were investigated. The microstructures of polyblends have been studied to interpret the mechanical behavior through dynamic viscoelasticity, wide‐angle X‐ray diffraction, differential scanning calorimetry, picnometry, and scanning electron microscopy. The properties of crosslinked PP/PE blends were determined by the content of crosslinking agent and processing method. For the material blended by roll, a 2% concentration of peroxide corresponded to a maximum tensile strength and minimum impact strength. However, the mechanical strength of those products blended by extrusion monotonously decreased with increasing peroxide content because of serious degradation. The interfacial adhesion of PP/PE blends could be enhanced by adding random or block copolymer of propylene and ethylene, and the impact strength as well as ductility were greatly improved. Experimental data showed that the impact strength of PP/LDPE/random copolymer ternary blend could reach as high as 33.3 kg · cm/cm; however, its rigidity and tensile strength were inferior to those of PP/LDPE/block copolymer blend.

Inhibition of prostaglandin I 2 (PGI 2) formation by LDL-cholesterol or LDL-peroxides?

A hypothesis of Gryglewski et al. explains the correlation between increased level of LDL and development of atherosclerosis by inhibition of PGI 2 synthesis by increased peroxide content of LDL. The aim of the present paper was to examine this hypothesis. The major results are: 1) Preparation of LDL in the presence of .02 % butylated hydroxytoluene did not reduce the lipid peroxide content of LDL from men and women and not change the inhibition or stimulation of the in vitro biosynthesis of PGI 2 by LDL isolated from blood of men or women, respectively. 2) In the LDL and HDL, respectively, of healthy men we found nearly the same lipid peroxide levels (nmole malondialdehyde (MDA)/mg lipoprotein-cholesterol) as in the lipoproteins of male patients with hyperlipidemia type IIa or IV, but the peroxide concentration is three times higher in HDL as in LDL. 3) LDL isolated from healthy men inhibited in dose dependent fashion the generation of PGI 2 from PGH 2 by aortic microsomes whereas LDL from premopausal women stimulated PGI 2 formation even calculated as LDL lipid peroxides (in nM MDA/ml). The results call into question the hypothesis that diminished PGI 2 formation by atherosclerotic vessels is related to inhibition of PGI 2 synthetase by lipid peroxides present in LDL in the lesions. A new working hypothesis is presented that also the fatty acid pattern and the lipid class composition in the LDL are important for their influence on the PGI 2 formation.

Polymerization of allyl methacrylate with nylon 6 using benzoyl peroxide as initiator

AbstractPolymerization of allyl methacrylate with nylon 6 using benzoyl peroxide as initiator was carried out under different conditions. The polymer add‐on was dependent upon allyl methacrylate and benzoyl peroxide concentrations, polymerization time and temperature as well as addition of metallic salts or organic solvents. The polymer add‐on increased by increasing benzoyl peroxide concentration up to 0.5 mmol/l then decreased by further increase in peroxide concentration, whereas it increased as the allyl methacrylate concentration increased from 80 – 300 mmol/l. A polymerization temperature of 85°C constituted the optimal temperature, below or above this temperature resulted in lower polymer add‐on. The effect of polymerization time was related to the polymerization temperature, no induction period occured at 95°C in contrast to 15 and 30 minutes at 85°C and 75°C, respectively. The incorporation of Cu+ +ions in the polymerization system improved the magnitude of polymer add‐on. A similar situation was encountered with Fe+ + + and Li+ ions. Using a water/organic solvent mixture as a polymerization medium was advantageous in enhancing polymer add‐on provided that the organic solvent did not exceed 1% in case of ethanol and isopropanol and 4% in case of methanol.

Regulation of hydrogen peroxide in eye humors effect of 3-amino-1H-1,2,4-triazole on catalase and glutathione peroxidase of rabbit eye

Activities of catalase (H 2O 2 : H 2O 2 oxidoreductase, EC 1.11.1.6) and GSH peroxidase (GSH : H 2O 2 oxidoreductase, EC 1.11.1.9) have been measured in iris, ciliary body, retina, corneal epithelium, corneal endothelium, lens capsule-epithelium and decapsulated lens. 3-Amino-1H-1,2,4-triazole is a specific inhibitor of catalase and a potent cataractogenic agent. We observed marked inhibition of catalase activity in these tissues 1–6 h after the administration of a single intravenous dose of 1 g 3-aminotriazole per kg body weight in rabbit. This was associated with a 2–3-fold increase in the H 2O 2 concentrations of aqueous humor and vitreous humor. The increased peroxide concentrations were restored to the physiological levels as the catalase activity of eye tissues gradually returned to normal with time after injection. Under the conditions, GSH peroxidase activity of the afore-mentioned eye tissues was unaltered, GSH and protein sulfhydryl of lens were not changed, and ascorbic acid of aqueous humor and vitreous humor was not significantly altered. Based on these findings our conclusion is that catalase of eye tissues regulates the endogenous H 2O 2 in eye humors to the physiological level. We speculate that H 2O 2 may be the triggering factor in cataract induced by 3-aminotriazole.

The alteration of superoxide dismutase, catalase, glutathione peroxidase, and NAD(P)H cytochrome c reductase in guinea pig polymorphonuclear leukocytes and alveolar macrophages during hyperoxia.

Superoxide dismutase, catalase, glutathione peroxidase and NAD(P)H cytochrome c reductase were quantitated in polymorphonuclear leukocytes (PMN) and alveolar macrophages (AM) obtained from guinea pigs exposed up to 90 h to 85% oxygen. PMN and AM were sonicated and separated into a 16,000-g pellet, a 100,000-g pellet, and a 100,00-g supernate. Superoxide dismutase activity increased in both cells within 18 h, persisted for 66 h and decreased by 90 h. The highest rate of increase was in the 100,000-g pellet containing 3.4% of total enzyme activity in PMN but 28% in AM. The enzyme induction in PMN and AM was partially inhibited by daily intracardiac injections of 50 mg/kg actinomycin D. During oxygen exposure, catalase activity in PMN and AM decreased to 60% of its original activity, and gluthathione peroxidase was reduced in PMN to 60% and in AM to 20% of control values. Although NAD(P)H cytochrome c reductase decreased to 50% in PMN, no change was noted in AM. Upon exposure to superoxide anion, purified catalase, the glutathione peroxidase of the 100,000-g supernate, NADH, and NADPH cytochrome c reductases of the 16,000-g pellet decreased to 66+/-5%, 72+/-4%, 52+/-8%, and 40+/-9%, respectively, of their original activity. This inactivation was prevented by 0.1 mg superoxide dismutase. These in vitro observations could explain the decreased catalase and glutathione peroxidase activity demonstrated in vivo that may lead to an intracellular accumulation of hydrogen peroxide. Increased hydrogen peroxide concentrations have been found to inactivate superoxide dismutase thus impairing the first defense mechanism against superoxide anion.

Graft copolymerization to cellulose. Effect of sodium thiosulfate on hydrogen peroxide initiator system

AbstractThe effect of sodium thiosulfate on the graft copolymerization of methyl methacrylate to cellulose in the hydrogen peroxide initiator system was investigated. The addition of sodium thiosulfate in general was effective for decreasing the per cent grafting and the average molecular weight of grafts and increasing the formation of homopolymer, and the effects became pronounced with increasing hydrogen peroxide concentration. Moreover, the addition of sodium thiosulfate slightly suppressed the formation of grafts at a hydrogen peroxide concentration of 3 mmole/l., but greatly promoted it at 20 mmole/l. Traces of metallic ions present in cellulose could not be eliminated sufficiently by treatment with 3N hydrochloric acid. Such ions were found to interact with hydrogen peroxide and thus participate directly in the initiation and termination of the polymerization reaction. EDTA, the chelating agent, was highly effective for suppressing such participation of metallic ions. In the hydrogen peroxide initiator system applied to the EDTA‐treated samples, sodium thiosulfate caused an effective initiation of graft formation.

Oxidative deterioration of partially processed soybean oil

AbstractThe oxidative stability of partially processed soybean oil has been investigated in laboratory‐and plant‐scale tests. Oxidation, as measured by peroxide formation, has been related to storage time and temperature, and availability of oxygen. The effects of this oxidation on finished product quality have been measured.Soybean oil stores best as crude oil. After refining and bleaching, the oil is more susceptible to oxidation than at other stages in processing. Increase in peroxide content is both time and temperature dependent. Substantial improvement in product quality can be obtained by minimizing exposure to oxygen.