scholarly journals Application of copper tailings combined with persulfate for better removing methyl orange from wastewater

2020 ◽  
Vol 82 (8) ◽  
pp. 1676-1686
Author(s):  
Jinpeng Wang ◽  
Ming Zhang ◽  
Runjuan Zhou ◽  
Jiyuan Li ◽  
Wei Zhao ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Methyl Orange ◽  
Radical Scavenging ◽  
Reactive Oxygen ◽  
Degradation Efficiency ◽  
Oxygen Species ◽  
Solution Ph ◽  
Copper Tailings ◽  
Intra Particle Diffusion ◽  
Ct Utilization

Abstract In this paper, wasted copper tailings (CT) were used to activate persulfate (PS) to degrade azo dye methyl orange (MO). The results show that a large amount of FeS2 contained in CT can slowly release Fe2+ in the aqueous solution to activate PS to generate reactive oxygen species to degrade MO. When the dosage of CT and PS was 2 g/L and 3 mM respectively, the MO degradation efficiency of 20 mg/L in the CT/PS system was 96.52% within 60 min. At the same time, it is found that CT has a certain adsorption capacity for MO, and the intra-particle diffusion model can well describe the adsorption process of MO by CT. The effects of related reaction parameters (CT dosage, PS dosage, initial MO concentration and solution pH) on MO degradation in CT/PS system were investigated. Compared with the direct addition of an equal amount of Fe2+ as in the CT/PS system, for homogeneous activated PS to degrade MO (Fe2+/PS), the results showed that the degradation efficiency of Fe2+/PS system for MO was lower than that of CT/PS system due to excessive Fe2+ consumption of . By comparing the Fe2+ and Fe3+ concentrations in the two systems, it was found that the CT/PS system could maintain a low Fe2+ concentration during the reaction process, and the Fe2+ released by CT could be used by PS to degrade MO more efficiently. The free radical scavenging experiments showed that the reactive oxygen species in the CT/PS system was mainly . This study not only proposed a new CT utilization approach, but also solved the problem of reduced degradation efficiency of organic pollutants caused by excessive Fe2+ in the Fenton-like reaction.

scholarly journals Vesicular Formation of Trans-Ferulic Acid: an Efficient Approach to Improve the Radical Scavenging and Antimicrobial Properties

2021 ◽  
Author(s):  
Anahita Rezaeiroshan ◽  
Majid Saeedi ◽  
Katayoun Morteza-Semnani ◽  
Jafar Akbari ◽  
Akbar Hedayatizadeh-Omran ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Reactive Oxygen Species ◽  
Ferulic Acid ◽  
Reactive Oxygen Species Production ◽  
Radical Scavenging ◽  
Reactive Oxygen ◽  
Entrapment Efficiency ◽  
The Body ◽  
Oxygen Species ◽  
Species Production

Abstract Purposes Reactive oxygen species production is harmful to human’s health. The presence of antioxidants in the body may help to diminish reactive oxygen species. Trans-ferulic acid is a good antioxidant, but its low water solubility excludes its utilization. The study aims to explore whether a vesicular drug delivery could be a way to overcome the poor absorption of trans-ferulic acid hence improving its antimicrobial efficiency and antioxidant effect. Methods Niosomal vesicles containing the drug were prepared by film hydration method. The obtained vesicles were investigated in terms of morphology, size, entrapment efficiency, release behavior, cellular cytotoxicity, antioxidant, cellular protection study, and antimicrobial evaluations. Results The optimized niosomal formulation had a particle size of 158.7 nm and entrapment efficiency of 21.64%. The results showed that the optimized formulation containing 25 μM of trans-ferulic acid could enhance the viability of human foreskin fibroblast HFF cell line against reactive oxygen species production. The minimum effective dose of the plain drug and the niosomal formulation against Staphylococcus aurous (ATCC 29213) was 750 µg/mL and 375 µg/mL, respectively, and for Escherichia coli (ATCC 25922), it was 750 µg/mL and 187/5 µg/mL, respectively. The formulation could also improve the minimum bactericidal concentration of the drug in Staphylococcus aurous, Escherichia coli, and Acinobacter baumannii (ATCC 19606). Conclusion These results revealed an improvement in both antibacterial and antioxidant effects of the drug in the niosomal formulation.

Sunlight-mediated degradation of methyl orange sensitized by riboflavin: Roles of reactive oxygen species

2015 ◽  
Vol 142 ◽  
pp. 18-24 ◽  
Author(s):  
Fang Xu ◽  
Xiang-Ning Song ◽  
Guo-Ping Sheng ◽  
Hong-Wei Luo ◽  
Wen-Wei Li ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Methyl Orange ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Degradation Of Methyl Orange

scholarly journals Determination of Total Phenolic, Tannin, Flavonoid Contents and Evaluation of Antioxidant Property of Amaranthus tricolor (L)

2017 ◽  
Vol 9 (6) ◽  
Author(s):  
Sowjanya Pulipati ◽  
P. Srinivasa Babu ◽  
U. Naveena ◽  
S.K. Rafeeka Parveen ◽  
S.K. Sumaya Nausheen ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Antioxidant Activity ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reactive Oxygen ◽  
Antioxidant Property ◽  
Total Phenolic ◽  
Oxygen Species ◽  
Amaranthus Tricolor

Free radicals or reactive oxygen species are involved in various pharmacological conditions. As synthetic antioxidants possess numerous adverse health effects, the medicinal plants possessing antioxidant components can be used to prevent harmful effects of reactive oxygen species. In the present study leaves of Amaranthus tricolor Linn were used to prepare chloroform (CEAT), methanolic (MEAT) and aqueous (AEAT) extracts, analyze the presence of phytochemicals and evaluation of in-vitro antioxidant property. Quantitative determination of phenols, tannins and flavonoids in leaves A.tricolor was carried out using spectrophotometric methods. The antioxidant activity was performed by DPPH, p-NDA radical scavenging methods for different extracts of the plant. The plant species showed that methanolic extract (MEAT) on higher concentration possess better antioxidant potential when compared with reference standard ascorbic acid. The plant extracts exhibited strong antioxidant DPPH radical scavenging activity with the IC50 values 290, 657, 830 and 130μg/ml of MEAT, CEAT, AEAT and ASA respectively. In scavenging hydroxyl radical by p-NDA method the MEAT showed maximum activity, CEAT showed moderate and AEAT showed minimum activity. The strongest antioxidant activity of MEAT could be due to the presence of flavonoids and phenols.

In- vitro Antioxidant and Cardio-protective effect of Delonix elata (L.) Leaf extract against Doxorubicin induced toxicity in H9c2 Cardio-myocyte cell line

2021 ◽  
pp. 5635-5641
Author(s):  
Archana V ◽  
Indumathy R
Keyword(s):  
Reactive Oxygen Species ◽  
Protective Effect ◽  
Cell Viability ◽  
Leaf Extract ◽  
Radical Scavenging ◽  
Reactive Oxygen ◽  
Ethanolic Extract ◽  
Antioxidant Property ◽  
Oxygen Species

Objective: The aim of this study is to evaluate the protective effect of Delonix elata (L.) leaf extract against doxorubicin-induced cardiotoxicity in H9c2 cells. Methods: Doxorubicin has been used to treat cancer, but its clinical uses are limited because of its dose-dependent cardiotoxicity. Reactive oxygen species play an important role in the pathological process of cardiotoxicity. The various extracts (pet.ether, ethyl acetate and ethanol) of Delonix elata leaves antioxidant property was evaluated by SOD antioxidant assay and DPPH free radical scavenging assay. The cells were incubated with different concentrations of various extracts of Delonix elata leaves for 2 hr, followed by incubation with 5µM doxorubicin for 24 hr. Cell viability was determined by using MTT assay, respectively. Results: The various extracts of Delonix elata leaves exhibits antioxidant activity. The Doxorubicin significantly decreased cell viability which was accompanied by an increased ROS production. Pre-treatment with various extracts of Delonix elata leaves increased the viability ofcells and inhibit the generation of reactive oxygen species. Conclusion: In this study, findings how that Delonix elata leaf extract exhibited a protective effect against oxidative stress-induced cardiomyocyte damage. The ethanolic extract of Delonix elata leaves possesses significant antioxidant and cardioprotective activity.

Radical-scavenging activity of glutathione, chitin derivatives and their combination‡

2016 ◽  
Vol 70 (6) ◽  
Author(s):  
Katarína Valachová ◽  
Tamer Mahmoud Tamer ◽  
Mohamed Mohy Eldin ◽  
Ladislav Šoltés
Keyword(s):  
Reactive Oxygen Species ◽  
Acetic Acid ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reactive Oxygen ◽  
Scavenging Activity ◽  
Oxygen Species ◽  
Amino Derivatives ◽  
Chitin Derivatives

AbstractSince chitosan and its amino-, cinnamo- or cinnamo-amino- derivatives are acid-soluble, the effect of acetic acid on hyaluronan (HA) macromolecules degraded by Cu(II) ions and ascorbate was examined to produce reactive oxygen species (ROS). Further, the effects of glutathione (GSH), chitosan and its derivatives, added individually or in combination, on the quenching of ROS and ABTS

Antioxidant Activity of Hizikia fusiformis on Reactive Oxygen Species Scavenging and Lipid Peroxidation Inhibition

2003 ◽  
Vol 9 (5) ◽  
pp. 339-346 ◽  
Author(s):  
Nalin Siriwardhana ◽  
K.-W. Lee ◽  
Y.-J. Jeon ◽  
S.-H. Kim ◽  
J.-W. Haw
Keyword(s):  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Lipid Peroxidation ◽  
Hydroxyl Radical ◽  
Radical Scavenging ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Ros Scavenging ◽  
Hizikia Fusiformis ◽  
Lipid Peroxidation Inhibition

Water and organic extracts (diethyl ether, chloroform, ethyl acetate, acetone, ethanol and methanol) obtained from Hizikia fusiformis were screened on reactive oxygen species (ROS) scavenging assays (1,1-diphenyl-2-picrylhydrazyl (DPPH), superoxide anion, hydrogen peroxide and hydroxyl radical) and lipid peroxidation (inhibition of linoleic acid oxidation) inhibitory assays. Water, methanol and ethanol extracts showed significant ROS radical scavenging activities. Water extracts showed high scavenging activities on hydrogen peroxide (around 76%) and DPPH radicals (around 75%) while it presented a moderate scavenging activity on hydroxyl radicals (around 54%). Comparatively higher ROS scavenging activities were recorded in hydroxyl radical and DPPH scavenging assays. DPPH radical scavenging activities were well correlated with the polyphenolic content. ROS scavenging and lipid peroxidation inhibition activities indicated that H. fusiformis might be a valuable natural antioxidative source containing both water and fatsoluble antioxidative components.

scholarly journals Impact of therapeutically induced reactive oxygen species and radical scavenging by α-tocopherol on tumor cell adhesion

2007 ◽  
Author(s):  
Oliver Thews ◽  
Christine Lambert ◽  
Debra Kelleher ◽  
Hans Biesalski ◽  
Peter Vaupel ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Cell Adhesion ◽  
Tumor Cell ◽  
Radical Scavenging ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Tumor Cell Adhesion

scholarly journals Stimulation of NADH-dependent microsomal DNA strand cleavage by rifamycin SV

1995 ◽  
Vol 307 (2) ◽  
pp. 361-367 ◽  
Author(s):  
E Kukiełka ◽  
A I Cederbaum
Keyword(s):  
Reactive Oxygen Species ◽  
Hydroxyl Radical ◽  
Radical Scavenging ◽  
Reactive Oxygen ◽  
Redox Cycling ◽  
Rat Liver Microsomes ◽  
Oxygen Species ◽  
Rifamycin Sv ◽  
Dna Strand ◽  
Stimulation Of

Rifamycin SV is an antibiotic anti-bacterial agent used in the treatment of tuberculosis. This drug can autoxidize, especially in the presence of metals, and generate reactive oxygen species. A previous study indicated that rifamycin SV can increase NADH-dependent microsomal production of reactive oxygen species. The current study evaluated the ability of rifamycin SV to interact with iron and increase microsomal production of hydroxyl radical, as detected by conversion of supercoiled plasmid DNA into the relaxed open circular state. The plasmid used was pBluescript II KS(-), and the forms of DNA were separated by agarose-gel electrophoresis. Incubation of rat liver microsomes with plasmid plus NADH plus ferric-ATP caused DNA strand cleavage. The addition of rifamycin SV produced a time- and concentration-dependent increase in DNA-strand cleavage. No stimulation by rifamycin SV occurred in the absence of microsomes, NADH or ferric-ATP. Stimulation occurred with other ferric complexes besides ferric-ATP, e.g. ferric-histidine, ferric-citrate, ferric-EDTA, and ferric-(NH4)2SO4. Rifamycin SV did not significantly increase the high rates of DNA strand cleavage found with NADPH as the microsomal reductant. The stimulation of NADH-dependent microsomal DNA strand cleavage was completely blocked by catalase, superoxide dismutase, GSH and a variety of hydroxyl-radical-scavenging agents, but not by anti-oxidants that prevent microsomal lipid peroxidation. Redox cycling agents, such as menadione and paraquat, in contrast with rifamycin SV, stimulated the NADPH-dependent reaction; menadione and rifamycin SV were superior to paraquat in stimulating the NADH-dependent reaction. These results indicate that rifamycin SV can, in the presence of an iron catalyst, increase microsomal production of reactive oxygen species which can cause DNA-strand cleavage. In contrast with other redox cycling agents, the stimulation by rifamycin SV is more pronounced with NADH than with NADPH as the microsomal reductant. Interactions between rifamycin SV, iron and NADH generating hydroxyl-radical-like species may play a role in some of the hepatotoxic effects associated with the use of this antibacterial antibiotic.

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