Facile method for spectroscopic examination of radical ions of hydrophilic carotenoids
文献情報
K. Razi Naqvi, Thor Bernt Melø, Tamás Jávorfi, Sergio González-Pérez
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.
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