Photochemical and photophysical behaviour of vitamin E: Interaction of its long-lived transient photoproducts with carotenoids

Multi-channel, flash kinetic spectroscopy with microsecond time resolution has been used for investigating the interactions between carotenoids and the following photoproducts of α-tocopherol (EH) in hexane, methanol, acetonitrile, and dimethyl sulfoxide: (a) the lowest triplet, (b) the tocopherol...

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Main Authors:	Naqvi, K. Razi, Melø, Thor Bernt, Sliwka, Hans Richard, Mohamad, Samsun Baharin, Partali, Vassilia
Format:	Article
Language:	English
Published:	Royal Society of Chemistry 2003
Subjects:	Q Science (General) R Medicine (General)
Online Access:	http://irep.iium.edu.my/31394/ http://irep.iium.edu.my/31394/ http://irep.iium.edu.my/31394/ http://irep.iium.edu.my/31394/1/Photochemical_and_photophysical.pdf

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recordtype	eprints
spelling	iium-313942013-08-19T03:09:32Z http://irep.iium.edu.my/31394/ Photochemical and photophysical behaviour of vitamin E: Interaction of its long-lived transient photoproducts with carotenoids Naqvi, K. Razi Melø, Thor Bernt Sliwka, Hans Richard Mohamad, Samsun Baharin Partali, Vassilia Q Science (General) R Medicine (General) Multi-channel, flash kinetic spectroscopy with microsecond time resolution has been used for investigating the interactions between carotenoids and the following photoproducts of α-tocopherol (EH) in hexane, methanol, acetonitrile, and dimethyl sulfoxide: (a) the lowest triplet, (b) the tocopherol radical cation, which could be seen only in the polar aprotic solvents acetonitrile and dimethyl sulfoxide, and (c) the neutral tocopheroxyl radical. The first two species reconvert to EH by transferring triplet excitation and positive charge (respectively) to the carotenoid; the third is unreactive. The relevance of these observations to photoprotection and the photoionisation of sterically hindered phenols is pointed out. Royal Society of Chemistry 2003-04 Article PeerReviewed application/pdf en http://irep.iium.edu.my/31394/1/Photochemical_and_photophysical.pdf Naqvi, K. Razi and Melø, Thor Bernt and Sliwka, Hans Richard and Mohamad, Samsun Baharin and Partali, Vassilia (2003) Photochemical and photophysical behaviour of vitamin E: Interaction of its long-lived transient photoproducts with carotenoids. Photochemical & Photobiological Sciences, 2 (4). pp. 381-385. ISSN 1474-905X http://pubs.rsc.org/en/content/articlelanding/2003/pp/b210972g/unauth 10.1039/B210972G
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	Q Science (General) R Medicine (General)
spellingShingle	Q Science (General) R Medicine (General) Naqvi, K. Razi Melø, Thor Bernt Sliwka, Hans Richard Mohamad, Samsun Baharin Partali, Vassilia Photochemical and photophysical behaviour of vitamin E: Interaction of its long-lived transient photoproducts with carotenoids
description	Multi-channel, flash kinetic spectroscopy with microsecond time resolution has been used for investigating the interactions between carotenoids and the following photoproducts of α-tocopherol (EH) in hexane, methanol, acetonitrile, and dimethyl sulfoxide: (a) the lowest triplet, (b) the tocopherol radical cation, which could be seen only in the polar aprotic solvents acetonitrile and dimethyl sulfoxide, and (c) the neutral tocopheroxyl radical. The first two species reconvert to EH by transferring triplet excitation and positive charge (respectively) to the carotenoid; the third is unreactive. The relevance of these observations to photoprotection and the photoionisation of sterically hindered phenols is pointed out.
format	Article
author	Naqvi, K. Razi Melø, Thor Bernt Sliwka, Hans Richard Mohamad, Samsun Baharin Partali, Vassilia
author_facet	Naqvi, K. Razi Melø, Thor Bernt Sliwka, Hans Richard Mohamad, Samsun Baharin Partali, Vassilia
author_sort	Naqvi, K. Razi
title	Photochemical and photophysical behaviour of vitamin E: Interaction of its long-lived transient photoproducts with carotenoids
title_short	Photochemical and photophysical behaviour of vitamin E: Interaction of its long-lived transient photoproducts with carotenoids
title_full	Photochemical and photophysical behaviour of vitamin E: Interaction of its long-lived transient photoproducts with carotenoids
title_fullStr	Photochemical and photophysical behaviour of vitamin E: Interaction of its long-lived transient photoproducts with carotenoids
title_full_unstemmed	Photochemical and photophysical behaviour of vitamin E: Interaction of its long-lived transient photoproducts with carotenoids
title_sort	photochemical and photophysical behaviour of vitamin e: interaction of its long-lived transient photoproducts with carotenoids
publisher	Royal Society of Chemistry
publishDate	2003
url	http://irep.iium.edu.my/31394/ http://irep.iium.edu.my/31394/ http://irep.iium.edu.my/31394/ http://irep.iium.edu.my/31394/1/Photochemical_and_photophysical.pdf
first_indexed	2023-09-18T20:45:36Z
last_indexed	2023-09-18T20:45:36Z
_version_	1777409653725986816

Photochemical and photophysical behaviour of vitamin E: Interaction of its long-lived transient photoproducts with carotenoids

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