Subject(s)
Cataract/etiology , Oxygen Consumption , Cataract/metabolism , Crystallins/metabolism , Crystallins/radiation effects , Humans , In Vitro Techniques , Lens, Crystalline/metabolism , Lens, Crystalline/radiation effects , Light , Oxidation-Reduction/radiation effects , Oxygen Consumption/radiation effects , SolubilityABSTRACT
Photooxidation of reduced forms of porphyrines (IIH2) was studied. It has been shown that photooxidation of IIH2 is sensitized by initial porphyrine formed in the course of the reaction. Singlet oxygen serves as the basic oxidizer. It is also informed that the search of metastable states of photoreduced anion forms of the pigments by means of flashphotolysis turned to be unsuccessful.
Subject(s)
Porphyrins , Light , Oxidation-Reduction , Spectrum AnalysisSubject(s)
Porphyrins , Chemical Phenomena , Chemistry , Magnetic Resonance Spectroscopy , Oxidation-Reduction , Ozone , TemperatureABSTRACT
Dependence of quantum yield of porphyrines photooxidation with oxygen on their concentration has been shown. Sensitized by some porphyrines oxidation of other ones with oxygen has been studied in relation to concentration, intensity and wave length of absorbed light, quantum yield, interconversion and life time of the molecules in triplet state. Common mechanism for direct and sensitized photooxidation has been suggested.
