singlet oxygen


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sin·glet ox·y·gen

an excited or higher-energy form of oxygen characterized by the spin of a pair of electrons in opposite directions, whereas electron spin is unidirectional in normal molecular oxygen Because of its great reactivity, singlet oxygen is a probable intermediate in most photooxidation reactions. Although it exists for no more than 0.1 second, it may react with atmospheric pollutants to foster smog formation and may have harmful biologic effects.

singlet oxygen

A highly active form of oxygen produced during reactions of hydrogen peroxide with superoxide and hypochlorite ions. It is believed that this free radical is bactericidal.
See also: oxygen
References in periodicals archive ?
(2016), the SOG reagent mainly labeled singlet oxygen externally, on the surface of the Symbiodinium cells.
These molecules can be adapted specifically to their application by changing its composition that will enable receptor targeting through overexpression of surface markers on the malignant cells, and they can enhance photon absorption and improve singlet oxygen by the surface plasmon resonance effect specifically gold nanoparticles [41], which can lead to increased ROS and cancer cell destruction.
The specificity and its photo physical properties such as quantum yield of singlet oxygen can be enhanced by conjugating the Pc with metal nanoparticles such as Ag, Zn, Co, Fe, and other metal nanoparticles [11, 12].
According to the first pathway, commonly referred to as the water-oxidation pathway, antibodies or amino acids catalyse the oxidation of water by singlet oxygen to form dihydrogen trioxide (HOOOH), followed by a not-so-well-defined decomposition of the latter to ozone and hydrogen peroxide [8-10].
where [[phi].sup.Std.sub.[DELTA]] is the singlet oxygen quantum yield for the standard unsubstituted ZnPc ([[phi].sup.Std.sub.[DELTA]] = 0.53 in THF) [20]; A and [A.sub.Std] are the integral of phosphorescence emission curve of singlet oxygen in 1270 nm of the studied compounds (1-4) and standard compounds, respectively.
[18] in the description of singlet oxygen generation photosensitized by xanthene dyes, many researchers have reviewed the subject for new applications of these dyes, being a topic of current interest [19-26].
Examples of ROS include superoxide anion (*-[O.sub.2]), hydrogen peroxide ([H.sub.2][O.sub.2]), hydroxyl radical (*OH), singlet oxygen ([sup.1][O.sub.2]), and ozone ([O.sub.3]).
Lycopene is also capable in quenching singlet oxygen. Lycopene normally is not an integral part of our food but it is mainly found in our diet, especially foods that contain tomato, tomato's sauce or its other processing products.
Palmer said Replere is the first antioxidant skin care line that targets the five free radicals that damage and age the skin: peroxyl, hydroxyl, peroxynitrite, superoxide anion and singlet oxygen. The products also tap into the power of coffee--specifically, Coffea arabica fruit.
PDIT is designed to harness the energy of singlet oxygen to defeat cancer cells without serious side effects while amplifying the immune system.
Li, EPR studies of singlet oxygen (1O2) and free radicals (O2.-, .OH, HB.-) generated during photosensitization of hypocrellin B., Free Radical Biol.