ON THE QUENCHING OF SINGLET OXYGEN BY α-TOCOPHEROL |
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| Authors: | S R Fahrenholtz F H Doleiden A M Trozzolo A A Lamola |
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| Institution: | Bell Laboratories, Murray Hill, New Jersey 07974, U.S.A. |
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| 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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