Facile Electron Uptake by Carotenoids Under Mild, Non-Radiative Conditions: Formation of Carotenoid Anions
作者:Christer L. Øpstad、Hans-Richard Sliwka、Vassilia Partali
DOI:10.1002/ejoc.201000481
日期:2010.8
Carotenoids – prominent antioxidants (= electron donors) – are commonly not recognized as electron acceptors. Nonetheless, carotenoids can take up electronsundermild chemical conditions: dioxocarotenoids in alkaline DMSO and DMF form stable deeply colored carotenoid dianions, which react with different additives to new carotenoid derivatives.
Carotenoids are prime examples for antioxidants: they donate electrons to noxious radicals. Density functional calculations anticipate the possibility of electron uptake by carotenoids. This prediction has been confirmed experimentally: carbonyl carotenoids, including the super-antioxidant astaxanthin, easily take up electrons and react as antireductants. (C) 2012 Elsevier Ltd. All rights reserved.