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

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

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Abstract

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.

Item Type:	Article (Journal)
Additional Information:	3696/31394
Uncontrolled Keywords:	carotenoid; photoproduct; vitamin; photophysical; photochemical; long-lived; triplet; behaviour; sulfoxide; dimethyl sulfoxide; interaction; dimethyl; tocopherol; radical; acetonitrile;
Subjects:	Q Science > Q Science (General) R Medicine > R Medicine (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Computational and Theoretical Sciences
Depositing User:	Dr. Samsun Baharin Mohamad
Date Deposited:	19 Aug 2013 11:09
Last Modified:	19 Aug 2013 11:09
URI:	http://irep.iium.edu.my/id/eprint/31394

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