Radicals Superoxide And Hydroxyl
Mostrando 1-12 de 65 artigos, teses e dissertações.
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1. Sonication enhances quality and antioxidant activity of blueberry juice
Abstract Effect of sonication on the blueberry juice was studied by evaluating the pH, viscosity, electric conductivity, color, total sugars, soluble solids, polyphenol, anthocyanidin, and radical scavenging activities. There were not any remarkable (p > 0.05) change in pH and electric conductivity. However, viscosity and color of blueberry juice markedly (p
Food Sci. Technol. Publicado em: 27/04/2017
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2. Isolation and characterization of flavanols from Anthocephalus cadamba and evaluation of their antioxidant, antigenotoxic, cytotoxic and COX-2 inhibitory activities
ABSTRACT In search of lead molecules for use in disease prevention and as food additive from natural sources, two flavanols were isolated from leaves of Anthocephalus cadamba (Roxb.) Miq., Rubiaceae. Their structures were established as 6-hydroxycoumarin-(4"→8)-(-)-epicatechin and 6-hydroxycoumarin-(4"→8)-(-)-epicatechin-(4→6‴)-(-)-epicatechin on the
Rev. bras. farmacogn.. Publicado em: 2016-08
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3. Antioxidant activities of kombucha prepared from three different substrates and changes in content of probiotics during storage
Kombucha is a health-promoting fermented beverage worldwide. The present study compared the free-radical scavenging abilities and total reducing power (TRP) of kombucha prepared from low-cost green tea (LGTK), black tea (BTK), and tea powder (TPK). LGTK had the highest scavenging abilities against 2,2-diphenyl-1-picrylhydrazyl (DPPH), superoxide anion and hy
Food Sci. Technol. Publicado em: 25/03/2014
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4. Extraction and in vitro antioxidant activity of exopolysaccharide by Pleurotus eryngii SI-02
The extraction parameters for Pleurotus eryngii SI-02 exopolysaccharide (EPS) produced during submerged culture were optimized using response surface methodology (RSM). The optimum conditions for EPS extraction were predicted to be, precipitation time 20.24 h, ethanol concentration 89.62% and pH 8.17, and EPS production was estimated at 7.27 g/L. The actual
Braz. J. Microbiol.. Publicado em: 2013-12
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5. Ruthenium(II) nitrosyls as radical scavenger / Nitrosilo complexos de rutênio(II) como captores de radicais de interesse biológico
The complexes trans-[Ru(NO)(NH3)4(L)](X)3 (1), [Ru(NO)(Hedta)] (2) and their synthetic precursors trans-[Ru(H2O)(NH3)4(L)](X)2 (3), trans-[Ru(SO4)(NH3)4(L)](X) (4) , where L = isn, nic, imN, 4-pic, py, P(OEt) e X = PF6 - and BF4 -, were tested as scavengers for the radicals DPPHo, OHo e O2 -o in aqueous media. The redox potential for the metal center in the
Publicado em: 2009
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6. Estudo das propriedades antioxidantes de complexos nitrosilados de rutênio
This study shows the antioxidant and secondary the cytotoxic activity of five different ruthenium nitrosyl complexes: trans-[Ru(NH3)4(L)(NO)]Cl3 (A - D; being (A) L = Caffeine, (B) L = Theophylline, (C) L = Methyl-1-imidazole, (D) L = Benzoimidazole), and (E) cis-[Ru(NH3)4(NO)2]Cl3. Only the complex (A) (L = Caffeine) presented significant reactivity identif
Publicado em: 2009
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7. Evaluation of the protective effect of carvedilol against the renal mitochondrial toxicity induced by cisplatin in rats / Avaliação do efeito protetor do carvedilol na toxicidade mitocondrial renal induzida pela cisplatina em ratos
Cisplatin (cis-diamminedichloridoplatinum II) is an affective anticancer agent; however its clinical use is highly limited, predominantly due to its nephrotoxicity. Many studies have shown that cisplatin cause mitochondrial dysfunction in renal epithelial cells due to the generation of reactive oxygen species, such as superoxide anions and hydroxyl radicals.
Publicado em: 2009
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8. Atividades biológicas de polissacarídeos sulfatados extraídos da alga vermelha gracilaria caudata
In recent years, sulfated polysaccharides (SP) from marine algae have emerged as an important class of natural biopolymers with potential pharmacology applications. Among these, SP isolated from the cell walls of red algae have been study due to their anticoagulant,antithrombotic and anti-inflammatory activities. In the present study, three sulfated polysacc
Publicado em: 2008
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9. Antioxidant and antimicrobial activities of Bauhinia racemosa L. stem bark
The present study was carried out to evaluate the antioxidant and antimicrobial activities of a methanol extract of Bauhinia racemosa (MEBR) (Caesalpiniaceae) stem bark in various systems. 1,1-Diphenyl-2-picryl-hydrazyl (DPPH) radical, superoxide anion radical, nitric oxide radical, and hydroxyl radical scavenging assays were carried out to evaluate the anti
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-07
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10. Elevated levels of erythrocyte-conjugated dienes indicate increased lipid peroxidation in schistosomiasis mansoni patients
Schistosoma mansoni causes liver disease by inducing granulomatous inflammation. This favors formation of reactive oxygen species, including superoxide ions, hydrogen peroxide and hydroxyl radicals all of which may induce lipid peroxidation. We have evaluated lipid peroxidation in 18 patients with hepatosplenic schistosomiasis mansoni previously treated with
Brazilian Journal of Medical and Biological Research. Publicado em: 2004-07
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11. The antioxidant action of Polypodium leucotomos extract and kojic acid: reactions with reactive oxygen species
Two natural products Polypodium leucotomos extract (PL) and kojic acid (KA) were tested for their ability to scavenge reactive oxygen species (·OH, ·O2-, H2O2, ¹O2) in phosphate buffer. Hydroxyl radicals were generated by the Fenton reaction, and the rate constants of scavenging were 1.6 x 10(9) M-1 s-1 for KA and 1.0 x 10(9) M-1 s-1 for PL, similar to th
Brazilian Journal of Medical and Biological Research. Publicado em: 2001-11
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12. Oxygen derived free radicals and synovial fluid hyaluronate.
High performance liquid chromatography with TSK 5000 PW or TSK 6000 PW size exclusion columns combined with a 125I labelled hyaluronic acid binding protein assay was used to study the effects of oxygen derived free radicals on synovial fluid hyaluronate. A continuous flux of free radicals was generated by the xanthine oxidase/hypoxanthine system. When the fr