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dc.contributor.authorBurke, Marc
dc.contributor.authorEdge, Ruth
dc.contributor.authorLand, Edward J
dc.contributor.authorTruscott, T G
dc.date.accessioned2009-11-06T14:32:25Z
dc.date.available2009-11-06T14:32:25Z
dc.date.issued2001-04
dc.identifier.citationCharacterisation of carotenoid radical cations in liposomal environments: interaction with vitamin C. 2001, 60 (1):1-6 J. Photochem. Photobiol. B, Biol.en
dc.identifier.issn1011-1344
dc.identifier.pmid11386675
dc.identifier.urihttp://hdl.handle.net/10541/85561
dc.description.abstractPulse radiolysis was used to generate the radical cations of beta-carotene and two xanthophylls, zeaxanthin and lutein, in unilamellar vesicles of dipalmitoylphosphatidyl choline. The rate constants for the reaction (repair) of these carotenoid radical cations with the water-soluble vitamin C were found to be similar (approximately 1x10(7) M(-1) s(-1)) for beta-carotene and zeaxanthin and somewhat lower (approximately 0.5x10(7) M(-1) s(-1)) for lutein. The results are discussed in terms of the microenvironment of the carotenoids and suggest that for beta-carotene, a hydrocarbon carotenoid, the radical cation is able to interact with a water-soluble species even though the parent hydrocarbon carotenoid is probably entirely in the non-polar region of the liposome.
dc.language.isoenen
dc.subject.mesh1,2-Dipalmitoylphosphatidylcholine
dc.subject.meshAscorbic Acid
dc.subject.meshCations
dc.subject.meshFree Radicals
dc.subject.meshLiposomes
dc.subject.meshLutein
dc.subject.meshMolecular Structure
dc.subject.meshSpectrophotometry, Ultraviolet
dc.subject.meshXanthophylls
dc.subject.meshbeta Carotene
dc.titleCharacterisation of carotenoid radical cations in liposomal environments: interaction with vitamin C.en
dc.typeArticleen
dc.contributor.departmentSchool of Chemistry and Physics, Lennard-Jones Laboratories, Keele University, Staffordshire, UK.en
dc.identifier.journalJournal of Photochemistry and Photobiology. B, Biologyen
html.description.abstractPulse radiolysis was used to generate the radical cations of beta-carotene and two xanthophylls, zeaxanthin and lutein, in unilamellar vesicles of dipalmitoylphosphatidyl choline. The rate constants for the reaction (repair) of these carotenoid radical cations with the water-soluble vitamin C were found to be similar (approximately 1x10(7) M(-1) s(-1)) for beta-carotene and zeaxanthin and somewhat lower (approximately 0.5x10(7) M(-1) s(-1)) for lutein. The results are discussed in terms of the microenvironment of the carotenoids and suggest that for beta-carotene, a hydrocarbon carotenoid, the radical cation is able to interact with a water-soluble species even though the parent hydrocarbon carotenoid is probably entirely in the non-polar region of the liposome.


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