Reaction paths for production of singlet oxygen from hydrogen peroxide and hypochlorite

2006 ◽  
Vol 425 (1-3) ◽  
pp. 40-43 ◽  
Author(s):  
Alice Maetzke ◽  
Svend J. Knak Jensen
Keyword(s):  
Hydrogen Peroxide ◽  
Singlet Oxygen ◽  
Reaction Paths

Oxidation of cyanide in water by singlet oxygen generated by the reaction between hydrogen peroxide and hypochlorite

2013 ◽  
Vol 50-51 ◽  
pp. 57-63 ◽  
Author(s):  
Luiz Alberto Cesar Teixeira ◽  
Meryelem Tania Churampi Arellano ◽  
Cristian Marquez Sarmiento ◽  
Lidia Yokoyama ◽  
Fabiana Valeria da Fonseca Araujo
Keyword(s):  
Hydrogen Peroxide ◽  
Singlet Oxygen

Disproportionation of hydrogen peroxide into singlet oxygen catalyzed by lanthanum-exchanged zeolites

2005 ◽  
Vol 233 (2) ◽  
pp. 422-433 ◽  
Author(s):  
J WAHLEN ◽  
S DEHERTOGH ◽  
D DEVOS ◽  
V NARDELLO ◽  
S BOGAERT ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Singlet Oxygen

Degradation of natural toxins by phthalocyanines–example of cyanobacterial toxin, microcystin

2010 ◽  
Vol 62 (2) ◽  
pp. 273-278 ◽  
Author(s):  
Daniel Jančula ◽  
Lucie Bláhová ◽  
Marie Karásková ◽  
Blahoslav Maršálek
Keyword(s):  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Visible Light ◽  
Singlet Oxygen ◽  
Oxygen Species ◽  
Cyanobacterial Toxin ◽  
Natural Toxins ◽  
Peptide Toxins ◽  
Near Future ◽  
Absorption Characteristics

Phthalocyanines (Pcs) are promising photosensitizers for use in various branches of science and industry. In the presence of visible light and diatomic oxygen, phthalocyanines can react to produce singlet oxygen, a member of reactive oxygen species able to damage different molecules and tissues. The aim of this study was to investigate the ability of phthalocyanines to degrade natural toxins in the presence of visible light. As the representative of hardly degradable toxins, a group of cyanobacterial peptide toxins—microcystin-LR—was chosen for this study. According to our results, phthalocyanines are able to degrade 61,5% of microcystins within a 48-hour incubation (38% of microcystins was degraded after 24 h and 24% after 12 h of incubation). Although other oxidants like hydrogen peroxide or ozone are able to degrade microcystins within several hours, we assume that by optimizing the spectrum emitted by light source and by changing the absorption characteristics of Pcs, microcystins degradation by phthalocyanines could be more effective in the near future.

Melatonin: Lowering the High Price of Free Radicals

Physiology ◽  
2000 ◽  
Vol 15 (5) ◽  
pp. 246-250 ◽  
Author(s):  
Russel J. Reiter
Keyword(s):  
Nitric Oxide ◽  
Hydrogen Peroxide ◽  
Free Radicals ◽  
Singlet Oxygen ◽  
High Price ◽  
Antioxidative Defense ◽  
Defense System ◽  
Toxic Species ◽  
Peroxynitrite Anion ◽  
Molecular Toxicity

The endogenous antioxidative defense system reduces molecular toxicity of oxygen and nitrogen-based reactive species. Melatonin is an efficient direct and indirect antioxidant. It detoxifies the highly reactive hydroxyl radical and neutralizes other toxic species, including singlet oxygen, hydrogen peroxide, nitric oxide, and peroxynitrite anion, and stimulates several antioxidative enzymes.

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