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pubmed-article:2223795pubmed:abstractTextThe aim of this study was to obtain a quantification of the antioxidant activity of ubiquinone. To this purpose the oxidation of egg yolk phosphatidylcholine both in solvent and in liposomes initiated by an azocompound has been studied either in the absence or in the presence of ubiquinone-3, using alpha-tocopherol as a reference antioxidant. The two experimental systems gave similar results. In the presence of ubiquinone-3 the oxidation rate was reduced with respect to control experiments but was faster than that in the presence of alpha-tocopherol. The amount of ubiquinone required to decrease the autoxidation rate was so high as to prevent detection of the induction period. The stoichiometric factor was greater than 2 and the rate constant of inhibition was two orders of magnitude lower than that of alpha-tocopherol. It is concluded that high concentrations of ubiquinone are required to exhibit significant antioxidant activity. A possible mechanism compatible with the stoichiometric factor larger than 2 for the inhibiting effect of ubiquinone is also suggested.lld:pubmed
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pubmed-article:2223795pubmed:authorpubmed-author:LandeHHlld:pubmed
pubmed-article:2223795pubmed:authorpubmed-author:PasqualiPPlld:pubmed
pubmed-article:2223795pubmed:authorpubmed-author:PedulliG FGFlld:pubmed
pubmed-article:2223795pubmed:authorpubmed-author:FiorentiniDDlld:pubmed
pubmed-article:2223795pubmed:authorpubmed-author:StefanelliCClld:pubmed
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pubmed-article:2223795pubmed:pagination223-8lld:pubmed
pubmed-article:2223795pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:2223795pubmed:year1990lld:pubmed
pubmed-article:2223795pubmed:articleTitleInhibition of autoxidation of egg yolk phosphatidylcholine in homogenous solution and in liposomes by oxidized ubiquinone.lld:pubmed
pubmed-article:2223795pubmed:affiliationDipartimento di Biochimica, Università di Bologna, Italy.lld:pubmed
pubmed-article:2223795pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2223795pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed