Issue 30, 2009
From the journal:

Physical Chemistry Chemical Physics

Facile method for spectroscopic examination of radical ions of hydrophilic carotenoids

K. Razi Naqvi,*a   Thor Bernt Melø,a   Tamás Jávorfi,b   Sergio González-Pérezc  and  Juan B. Arellanoac  

* Corresponding authors

a Department of Physics, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
E-mail: razi.naqvi@ntnu.no
Fax: +47 7359 7710
Tel: +47 7359 1853

b Diamond Light Source Ltd, Didcot, Oxfordshire, United Kingdom

c Instituto de Recursos Naturales y Agrobiología de Salamanca (IRNASA-CSIC), Apdo. 257, Spain

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.

Graphical abstract: Facile method for spectroscopic examination of radical ions of hydrophilic carotenoids

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Article information

DOI
https://doi.org/10.1039/B905454E
Article type
Paper
Submitted
18 Mar 2009
Accepted
07 May 2009
First published
09 Jun 2009

Phys. Chem. Chem. Phys., 2009,11, 6401-6405

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Facile method for spectroscopic examination of radical ions of hydrophilic carotenoids

K. R. Naqvi, T. B. Melø, T. Jávorfi, S. González-Pérez and J. B. Arellano, Phys. Chem. Chem. Phys., 2009, 11, 6401 DOI: 10.1039/B905454E

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