Stopped-flow kinetic study of vitamin E regeneration reaction with biological hydroquinones (reduced forms of ubiquinone, vitamin K, and tocopherolquinone) in solution.

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Stopped-flow kinetic study of vitamin E regeneration reaction with biological hydroquinones (reduced forms of ubiquinone, vitamin K, and tocopherolquinone) in solution.

A kinetic study of the regeneration reaction of vitamin E (tocopherol) with eight biological hydroquinones (HQs) (ubiquinol-10 (Q10H2 1); ubiquinol-0 (Q0H2 2); vitamin K1 HQ (VK1H2 3); vitamin K3 HQ (VK3H2 4); alpha-, beta-, and gamma-tocopherol-HQs (alpha-, beta-, and gamma-TQH2 5-7); and 2,3,5-trimethyl-1,4-HQ (TMQH2 8)) in solution was performed. The second-order rate constants (k4) for the ...

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Stopped - flow Kinetic Study of Vitamin E Regeneration Reaction with Biological Hydroquinones ( Reduced Forms of Ubiquinone , Vitamin K , and Tocopherolquinone ) in

A kinetic study of the regeneration reaction of vitamin E (tocopherol) with eight biological hydroquinones (HQs) (ubiquinol-10 (QloH2 1); ubiquinol-0 (QoH2 2); vitamin K1 HQ (VKIH2 3); vitamin Kg HQ (VKSHZ 4); a-, 8-, and y-tocopherol-HQs (a-, B-, and r-TQH2 B-z); and 2,3,5-trimethyl-1,4-HQ (TMQH2 S)) in solution was performed. The second-order rate constants (k4) for the reaction of HQs 1-S wi...

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Ubiquinone and vitamin K in bacteria.

3. Liver mitochondria isolated after suspension in 5 mM-sodium salicylate in 0-44m-sucrose carried out oxidative phosphorylation nearly as efficiently as the controls. 4. Salicylate was taken up by mitochondria at 00, but the binding was extremely labile. From 78 to 95 % of the salicylate taken up was removed by one rapid wash in sucrose medium. 5. The intracellular fluid of the livers of sailc...

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Kinetic study of the radical-scavenging activity of vitamin E and ubiquinone.

Quantitative in vitro studies of antioxidant activities have been performed under aerobic conditions. However, since the biological system has lower oxygen tension, the effectiveness of antioxidants may be considerably different in vivo. alpha-Tocopherol, in vivo the most active tocopherol, is a very poor antioxidant in vitro. To clarify these points, the radical-scavenging activities of vitami...

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Study Of Interaction of Glutathione, Vitamin C and Vitamin E Under Hyperbaric Oxygen

In order to study the interaction of glutathione, vitamin C and vitamin E under hyperoxia (95 % oxygen) and hyperbaric oxygen (2.5 atmospheric pressure), 20 days old male Guinea pigs were fed with basal vitamin C free diet, while receiving a vitamin C supplement of either high concentration (50 mg/day) or low concentration (1 mg/day) for two weeks. Animals were than exposed to hyperoxia and hyp...

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ژورنال

عنوان ژورنال: Journal of Biological Chemistry

سال: 1992

ISSN: 0021-9258

DOI: 10.1016/s0021-9258(18)41666-3