No abstract

Abstract—D‐α‐tocopherol was found to be an effective quencher of 1O2 molecules (k= 2.5 times 108→mol‐1 s‐1 in pyridine) by measuring its effect on the autosensitized photooxidation of rubrene. The quenching process was shown to be almost entirely ‘physical’, that is, α‐tocopherol deactivated about 120 1O2 molecules before being destroyed. The results suggest that this process may be a mechanism for the protective effect of α ‐ tocopherol in photodynamic action.

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3beta-Hydroxy-5alpha-hydroperoxy-Delta(6)-cholestene is produced in protoporphyrin-containing red blood cell ghosts irradiated with approximately 400-nanometer light in the presence of oxygen. Incorporation of this cholesterol photooxidation product into normal red blood cells leads to increased osmotic fragility and eventual hemolysis. These results may be relevant to photohemolysis associated with erythropoietic protoporphyria.

No abstract