A comparison of chemical systems for luminometric determination of antioxidant capacity towards individual reactive oxygen species

Luminescence ◽  
2006 ◽  
Vol 21 (4) ◽  
pp. 239-244 ◽  
Author(s):  
Daniela Komrskova ◽  
Antonin Lojek ◽  
Jan Hrbac ◽  
Milan Ciz
Keyword(s):  
Reactive Oxygen Species ◽  
Antioxidant Capacity ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Chemical Systems

Electrochemical Biosensors for the Determination of the Antioxidant Capacity in Foods and Beverages Based on Reactive Oxygen Species

2012 ◽  
Vol 8 (4) ◽  
pp. 428-435 ◽  
Author(s):  
Carole Calas-Blanchard ◽  
Montserrat Cortina-Puig ◽  
Lise Barthelmebs ◽  
Thierry Noguer
Keyword(s):  
Reactive Oxygen Species ◽  
Antioxidant Capacity ◽  
Reactive Oxygen ◽  
Electrochemical Biosensors ◽  
Oxygen Species

scholarly journals The Effects of Bioactive Compounds from Blueberry and Blackcurrant Powder on Oat Bran Pastes: Enhancing In Vitro Antioxidant Activity and Reducing Reactive Oxygen Species in Lipopolysaccharide-Stimulated Raw264.7 Macrophages

Antioxidants ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 388
Author(s):  
Xiao Dan Hui ◽  
Gang Wu ◽  
Duo Han ◽  
Xi Gong ◽  
Xi Yang Wu ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Antioxidant Capacity ◽  
Bioactive Compounds ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Raw264.7 Macrophages ◽  
Oat Bran

In this study, blueberry and blackcurrant powder were chosen as the phenolic-rich enrichments for oat bran. A Rapid Visco Analyser was used to form blueberry and blackcurrant enriched oat pastes. An in vitro digestion process evaluated the changes of phenolic compounds and the in vitro antioxidant potential of extracts of pastes. The anthocyanidin profiles in the extracts were characterised by the pH differential method. The results showed that blueberry and blackcurrant powder significantly increased the content of phenolic compounds and the in vitro antioxidant capacity of pastes, while the total flavonoid content decreased after digestion compared to the undigested samples. Strong correlations between these bioactive compounds and antioxidant values were observed. Lipopolysaccharide-stimulated RAW264.7 macrophages were used to investigate the intracellular antioxidant activity of the extracts from the digested oat bran paste with 25% enrichment of blueberry or blackcurrant powder. The results indicated that the extracts of digested pastes prevented the macrophages from experiencing lipopolysaccharide (LPS)-stimulated intracellular reactive oxygen species accumulation, mainly by the Kelch-like ECH-associated protein 1 (Keap1)/nuclear factor erythroid 2-related factor 2 (Nrf2) signalling pathway. These findings suggest that the bioactive ingredients from blueberry and blackcurrant powder enhanced the in vitro and intracellular antioxidant capacity of oat bran pastes, and these enriched pastes have the potential to be utilised in the development of the functional foods.

UV-Vis Spectrophotometrical and Analytical Methodology for the Determination of Singlet Oxygen in New Antibacterials Drugs

2007 ◽  
Vol 2 ◽  
pp. 117739010700200 ◽  
Author(s):  
Tamara Zoltan ◽  
Franklin Vargas ◽  
Carla Izzo
Keyword(s):  
Reactive Oxygen Species ◽  
Singlet Oxygen ◽  
Nalidixic Acid ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Inexpensive Method ◽  
Analytical Methodology ◽  
First Time

We have determined and quantified spectrophotometrically the capacity of producing reactive oxygen species (ROS) as 1O2 during the photolysis with UV-A light of 5 new synthesized naphthyl ester derivates of well-known quinolone antibacterials (nalidixic acid (1), cinoxacin (2), norfloxacin (3), ciprofloxacin (4) and enoxacin (5)). The ability of the naphthyl ester derivatives (6-10) to generate singlet oxygen were detecting and for the first time quantified by the histidine assay, a sensitive, fast and inexpensive method. The following tendency of generation of singlet oxygen was observed: compounds 7 >10 > 6 > 8 > 9 >> parent drugs 1-5.

Solid-phase supported profluorescent nitroxide probe for the determination of aerosol-borne reactive oxygen species

Talanta ◽  
2013 ◽  
Vol 116 ◽  
pp. 1033-1039 ◽  
Author(s):  
Mohamad Sleiman ◽  
Hugo Destaillats ◽  
Lara A. Gundel
Keyword(s):  
Reactive Oxygen Species ◽  
Solid Phase ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Nitroxide Probe

scholarly journals An Immunohistochemical Study of the Increase in Antioxidant Capacity of Corneal Epithelial Cells by Molecular Hydrogen, Leading to the Suppression of Alkali-Induced Oxidative Stress

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Cestmir Cejka ◽  
Jan Kossl ◽  
Vladimir Holan ◽  
John H. Zhang ◽  
Jitka Cejkova
Keyword(s):  
Oxidative Stress ◽  
Reactive Oxygen Species ◽  
Antioxidant Capacity ◽  
Molecular Hydrogen ◽  
Reactive Oxygen ◽  
Corneal Neovascularization ◽  
Scar Formation ◽  
Oxygen Species ◽  
Buffer Solution ◽  
Corneal Epithelial

Corneal alkali burns are potentially blinding injuries. Alkali induces oxidative stress in corneas followed by excessive corneal inflammation, neovascularization, and untransparent scar formation. Molecular hydrogen (H2), a potent reactive oxygen species (ROS) scavenger, suppresses oxidative stress and enables corneal healing when applied on the corneal surface. The purpose of this study was to examine whether the H2 pretreatment of healthy corneas evokes a protective effect against corneal alkali-induced oxidative stress. Rabbit eyes were pretreated with a H2 solution or buffer solution, by drops onto the ocular surface, and the corneas were then burned with 0.25 M NaOH. The results obtained with immunohistochemistry and pachymetry showed that in the corneas of H2-pretreated eyes, slight oxidative stress appeared followed by an increased expression of antioxidant enzymes. When these corneas were postburned with alkali, the alkali-induced oxidative stress was suppressed. This was in contrast to postburned buffer-pretreated corneas, where the oxidative stress was strong. These corneas healed with scar formation and neovascularization, whereas corneas of H2-pretreated eyes healed with restoration of transparency in the majority of cases. Corneal neovascularization was strongly suppressed. Our results suggest that the corneal alkali-induced oxidative stress was reduced via the increased antioxidant capacity of corneal cells against reactive oxygen species (ROS). It is further suggested that the ability of H2 to induce the increase in antioxidant cell capacity is important for eye protection against various diseases or external influences associated with ROS production.

scholarly journals Fluorophotometric Determination of Hydrogen Peroxide and Other Reactive Oxygen Species with Fluorescein Hydrazide (FH) and Its Crystal Structure

2008 ◽  
Vol 56 (7) ◽  
pp. 977-981 ◽  
Author(s):  
Ryosuke Nakahara ◽  
Tsuyoshi Fujimoto ◽  
Mitsunobu Doi ◽  
Kanako Morita ◽  
Takako Yamaguchi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Reactive Oxygen ◽  
Oxygen Species
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