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Biological formation, hydrogen peroxide

Puppo, A. and Halliwell, B. (1988). Formation of hydroxyl radicals from hydrogen peroxide in the presence of iron. Is haemoglobin a biological Fenton catalyst Biochem. J. 249, 185-190. [Pg.276]

The reduction of Fe(III) by carotenoids may have deleterious consequences. The reduced iron Fe(II) can react with hydrogen peroxide leading to the formation of hydroxyl radical, the most reactive free radical encountered in biological systems (Equation 15.10) ... [Pg.329]

Since ascorbate reduces photooxidation of lipid emulsions and multivitamin preparations (see Figure 4) [19], Lavoie et al. [34] studied the formation of oxidative by-products of vitamin C in multivitamins exposed to light. They found that the loss of ascorbic acid in photoexposed multivitamin preparations was associated with the generation of products other than dehydroascorbate and 2,3-diketogulonic acid, which are the usual products of vitamin C oxidation. The authors showed that hydrogen peroxide at concentrations found in TPN solutions induced the transformation of dehydroascorbate into new, biologically active compounds that had the potential to affect lipid metabolism. They believe that these species have peroxide and aldehyde functions [35]. [Pg.478]

Two fluorescent probes dihydroethidium (DHE) and dichlorodihydrofluorescein (DCFH) are used for superoxide detection in biological systems [54]. Both assays are subjected to some drawbacks such as the oxidation of cytochrome c, the dismutation of superoxide in the presence of DHE [79], and the interaction of DCFH with hydrogen peroxide, hydroperoxides, or peroxynitrite. Particularly big enhancement of DCF formation due to the oxidation of cytochrome c is observed when cytochrome is released from mitochondria during cell death... [Pg.971]

Formation of hydrogen peroxide (a biological poison) by free radical mechanism. [Pg.1406]

Ortmans I, Moucheron C, Kirsch-De Mesmaeker A (1998) Ru(ll) polypyridine complexes with a high oxidation power. Comparison between their photoelectrochemisty with transparent SnC>2 and their photochemistry with desoxyribonucleic acids. Coord Chem Rev 168 233-271 Ozawa T, Ueda J, Flanaki A (1993) Copper(ll)-albumin complex can activate hydrogen peroxide in the presence of biological reductants first ESR evidence for the formation of hydroxyl radical. Biochem Mol Biol Int 29 247-253... [Pg.45]

Hydrogen peroxide diffuses freely through biological membranes, while ferrous atoms are tightly bound to specific carriers. Therefore, the site of "OH formation usually corresponds to the present site of ferrous ions (site specificity of "OH formation ). Thus, concentration of available ferrous ions is considered a limiting factor for the hydroxyl radical formation in vivo. [Pg.168]


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See also in sourсe #XX -- [ Pg.400 , Pg.404 ]




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Biological hydrogen

Hydrogen formation

Hydrogen peroxide formation

Hydrogenation formation

Hydrogenations formate

Peroxides formation

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