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Facile method for spectroscopic examination of radical ions of hydrophilic carotenoids

DOI: 10.1039/b905454e DOI Help

Authors: Kalbe Razi Naqvi (Norwegian University of Science and Technology (NTNU), Trondheim, Norway) , Thor Bernt Melo (Norwegian University of Science and Technology (NTNU), Trondheim, Norway) , Tamas Javorfi (Diamond Light Source) , Sergio Gonzalez-perez (CSIC, IRNASA) , Juan Arellano (CSIC, IRNASA)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Chemistry And Chemical Physics , VOL 11 (30) , PAGES 6401-6405

State: Published (Approved)
Published: August 2009

Abstract: Hydrophilic carotenoids, unusual members of an intrinsically hydrophobic family, and their radical ions are important reactants. An all-optical method for generating singly charged radical ions of a hydrophilic carotenoid (Car) is described. It relies on photolyzing an aqueous mixture of Car and a photoionizable auxiliary solute (A), and making conditions conducive to the capture, by Car, of the hydrated electron (e?aq) or the positive hole in A?+ or both. When A is Trolox (TOH), only e?aq can be captured, since TOH?+ deprotonates too rapidly to be a hole donor; when A is Trolox methyl ether (TOMe), both Car?? and Car?+ are formed, since TOMe?+ lives long enough to transfer its positive hole to Car; formation of Car?? is prevented under aerobic conditions.

Journal Keywords: Carotenoids; Vitamin E; Radical Ion; Pump-Probe Spectroscopy; Transient Absorption

Subject Areas: Chemistry, Physics, Biology and Bio-materials


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