The reduction potential of the beta-carotene.+ /beta-carotene couple in an aqueous micro-heterogeneous environment.
Edge, Ruth Land, Edward J McGarvey, David J Burke, Marc Truscott, T G
Edge, Ruth
Land, Edward J
McGarvey, David J
Burke, Marc
Truscott, T G
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Abstract
There is a resurgence of interest in the role of electron transfer reactions involving beta-carotene in photosynthesis. There is also current debate on the health benefits of dietary carotenoids and the possible deleterious effects on certain sub-populations such as smokers. The impact of dietary carotenoids on health may well be also related to radical reactions. A key parameter in biological systems is therefore the one-electron reduction potential of the carotenoid radical cation, now reported for the first time in a model biological aqueous environment. The value obtained is 1.06+/-0. 01 V and is sufficiently high to oxidise cell membrane proteins, but is low enough to repair P(680).+ in the photosynthetic reaction centre.
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2000-04-14
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The reduction potential of the beta-carotene.+ /beta-carotene couple in an aqueous micro-heterogeneous environment. 2000, 471 (2-3):125-7 FEBS Lett.