Theory of electron transfer generation and quenching of singlet oxygen [1.SIGMA.g+ and 1.DELTA.g] by superoxide anion. The role of water in the dismutation of superoxide anion

1977 ◽  
Vol 99 (2) ◽  
pp. 370-371 ◽  
Author(s):  
Ahsan U. Khan
Keyword(s):  
Electron Transfer ◽  
Singlet Oxygen ◽  
Superoxide Anion

scholarly journals Scope and limitations of the TEMPO/EPR method for singlet oxygen detection: the misleading role of electron transfer

2014 ◽  
Vol 77 ◽  
pp. 64-70 ◽  
Author(s):  
Giacomo Nardi ◽  
Ilse Manet ◽  
Sandra Monti ◽  
Miguel A. Miranda ◽  
Virginie Lhiaubet-Vallet
Keyword(s):  
Electron Transfer ◽  
Singlet Oxygen ◽  
Epr Method ◽  
Oxygen Detection

scholarly journals Ethylene formation by polymorphonuclear leukocytes. Role of myeloperoxidase.

1978 ◽  
Vol 148 (2) ◽  
pp. 490-506 ◽  
Author(s):  
S J Klebanoff ◽  
H Rosen
Keyword(s):  
Singlet Oxygen ◽  
Hydroxyl Radicals ◽  
Superoxide Anion ◽  
Polymorphonuclear Leukocytes ◽  
Model System ◽  
Ethylene Formation ◽  
Dye Sensitized ◽  
Stimulation Of

Ethylene formation from the thioethers, beta-methylthiopropionaldehyde (methional) and 2-keto-4-thiomethylbutyric acid by phagocytosing polymorphonuclear leukocytes (PMNs) was found to be largely dependent on myeloperoxidase (MPO). Conversion was less than 10% of normal when MPO-deficient PMNs were employed; formation by normal PMNs was inhibited by the peroxidase inhibitors, azide, and cyanide, and a model system consisting of MPO, H2O2, chloride (or bromide) and EDTA was found which shared many of the properties of the predominant PMN system. MPO-independent mechanisms of ethylene formation were also identified. Ethylene formation from methional by phagocytosing eosinophils and by H2O2 in the presence or absence of catalase was stimulated by azide. The presence of MPO-independent, azide-stimulable systems in the PMN preparations was suggested by the azide stimulation of ethylene formation from methional when MPO-deficient leukocytes were employed. Ethylene formation by dye-sensitized photooxidation was also demonstrated and evidence obtained for the involvement of singlet oxygen (1O2). These findings are discussed in relation to the participation of H2O2, hydroxyl radicals, the superoxide anion and 1O2 in the formation of ethylene by PMNs and by the MPO model system.

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