Singlet oxygen scavenger

Packer, J.E., Mahood, J.S., Mora-Arellano, V.O., Slater, T.F., Willson, R.L., and Wolfenden, B.S. 1981. Free radicals and singlet oxygen scavengers Reaction of a peroxy-radical with P-carotene, diphenyl furan and 1,4-diazobicyclo (2,2,2)-octane. Biochem. Biophys. Res. Commun. 98 901-906. 

The spectral changes observed during oxidation provide a means for monitoring the kinetics of the oxidation process. The reactions follow a rate law that is first order in [Ni] and first order in [02] Rate = fc[Ni(L)CN] [02] (79). The reaction is relatively slow and not very sensitive to the nature of the N-substituent (k = 1.4-3.1 X 10 2 M 1 s-1 in dimethylformamide (DMF) at 30 °C). The reaction rates are independent of the presence of a singlet oxygen scavenger or radical traps. The activation parameters AH and AS were measured by using the temperature dependence of the second-order rate constants in DMF... 

Singlet Oxygen Scavengers and/or Quenchers — /3-carotene, a-tocopherol. histidine, tryptophan, guanine, uric acid Hydroxyl Radical Scavengers — most organic compounds k 8 10 M- s- ... 

PACKER J E, MAHOOD J S, MORA-ARELLANO V O, SLATER T E, WILLSON R L and WOLFENDEN B s (1981), Free radicals and singlet oxygen scavengers reaction of a peroxy-radical with /3-carotene, diphei rl furane and 1,4-diazobicyclo(2,2,2)-octane , Biochem BiophysRes Commun, 98, 901-906. 

Ao, Y., K. Satoh, K. Shibano, Y. Kawahito, and S. Shioda, 2008. Singlet oxygen scavenging activity and cytotoxicity of essential oils from rutaceae. J. Clin. Biochem. Nutr., 43(1) 6-12. 

Li B, Ahmed F, Bernstein PS (2010) Studies rat the singlet oxygen scavenging mechanism of human macular pigment. Arch Biochem Biophys 504 56-60. doi 10.1016/j.abb.2010.07.024... 

Vitamins that have a role as antioxidants (vitamin E, ascorbic acid and provitamins A) are easily oxidisable substances that react with free radicals or act as singlet oxygen scavengers. The reaction of tocopherols (T-OH) with hydroperoxyl radicals (ROO ) is also a part of the protective mechanisms in biomembranes of living tissues ... 

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