Scavenger of hydrogen

WETTASiNGHE M and SHAHiDi F (1999) Evening Primrose Meal A source ofnatural antioxidants and scavenger of hydrogen peroxide and oxygen-derived free radicals, JAgric Food Chem, 47, 1801-12. 

Hirota, S., Nishioka, T., Shimoda, T., Miura, K, Ansal, T., and Takahama, U., Quercetin gluco-sides are hydrolysed to quercetin in human oral cavity to participate in peroxidase-dependent scavenging of hydrogen peroxide. Food Set Technol Res., 7, 239, 2001. 

Wei, H. et al., Scavenging of hydrogen peroxide and inhibition of ultraviolet light-induced oxidative DNA damage by aqueous extracts from green and black teas, Free Radio. Biol. Med., 26, 1427-1435, 1999. 

Miyake, C., Michihata, F., and Asada, K., 1991, Scavenging of hydrogen peroxide in prokaryotic and eukaryotic algae acquisition of ascorbate peroxidase during the evolution of cyanobacteria. Plant Cell Physiol. 32 33n43. 

Norton and co-workers 102) briefly noted that photolysis of Os(CH3)2(CO)4 in hexane solution led to the formation methane but produced no ethane. Presumably, methane derives from photoinduced homolysis of an osmium-methyl bond and scavenging of hydrogen by the resultant methyl radical. 

Oxygen is a diradical that enhances radiation damage by forming radicals with other radicals. An example is the scavenging of hydrogen atoms by molecular oxygen to form the hydroperoxy radical. 

Mkoji, G. M., Smith, J. M. and Prichard, R. K. (1988) Antioxidant systems in Schistosoma mansoni correlation between susceptibility to oxidant killing and the levels of scavengers of hydrogen peroxide and oxygen free radicals. Int. J. Parasitol. 18 661-666. 

In tracheal explants, the basal level of amosite asbestos uptake can be decreased by adding catalase, a scavenger of hydrogen peroxide, to the dust suspension, or by preincubating the dust with the iron chelator, deferoxamine (124), a chelator that prevents the reaction of iron with hydrogen peroxide to form a hydroxyl radical (6). The decreases in particle uptake are scavenger-chelator dose-dependent, but uptake cannot be reduced below about one-third to one-half the basal level (124). Conversely, uptake can be increased if amosite asbestos or titanium dioxide particles are preincubated with iron salt solutions to increase surface iron before they are applied to the explants (125). 

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