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Carotenoid radical interaction oxygen

Spin trapping methods were also used to show that when carotenoid-P-cyclodextrin 1 1 inclusion complex is formed (Polyakov et al. 2004), cyclodextrin does not prevent the reaction of carotenoids with Fe3+ ions but does reduce their scavenging rate toward OOH radicals. This implies that different sites of the carotenoid interact with free radicals and the Fe3+ ions. Presumably, the OOH radical attacks only the cyclohexene ring of the carotenoid. This indicates that the torus-shaped cyclodextrins, Scheme 9.6, protects the incorporated carotenoids from reactive oxygen species. Since cyclodextrins are widely used as carriers and stabilizers of dietary carotenoids, this demonstrates a mechanism for their safe delivery to the cell membrane before reaction with oxygen species occurs. [Pg.167]

Carotenoid Radicals and the Interaction of Carotenoids with Active Oxygen Species... [Pg.223]

The interaction of carotenoids and carotenoid radicals with other anti-oxidants is of importance with respect to anti-oxidative and possibly pro-oxidative reactions of carotenoids. All the radical cations of the carotenoids studied reacted with vitamin C so as to repair the carotenoid (e.g. in methanol, CAR t AscH CAR + AscH -I- H ). hi polar environments the vitamin E radical cation is deprotonated (TOH —> TO -i- H ) and TO does not react with carotenoids, whereas in non-polar environments, TOH is converted into TOH by hydrocarbon carotenoids, hi aU solvents studied, singlet oxygen is efficiently quenched by carotenoids that have appropriate low-lying triplet energy levels O -i- CAR -> Oj -i- CAR". However, such reactions are stiU to be observed in vivo. [Pg.223]

Edge R, Land EJ, McGarvey D, Mulroy L and Tmscott TG (1998) Relative one-electron reduction potentials of carotenoid radical cations and the interactions of carotenoids with the vitamin E radical cation. J AmerChem Soc 120 4087-4090 Everett SA, Dennis MF, Patel KB, Maddix S, Kundu SC and Willson RL (1996) Scavengingofnitrogendioxide, thiyl, and sulphonyl free radicals by the nutritional anti-oxidant fi-carotene. J Biol Chem 271 3988-3994 Foote CS and Denny RW (1968) Chemistry of singlet oxygen. [Pg.233]

Carotenoid radical cations are formulated as intermediates in various reactions between carotenoids and reactive oxygen species [50,52], Carotenoids may interact with free radicals in three different ways [50] ... [Pg.524]

Krinsky, N. I. and S. M. Deneke (1982). Interaction of oxygen and oxy-radicals with carotenoids. J. Natl. Cancer Inst. 69(1) 205-210. [Pg.279]


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See also in sourсe #XX -- [ Pg.297 ]




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