Article ID Journal Published Year Pages File Type
26679 Journal of Photochemistry and Photobiology A: Chemistry 2011 7 Pages PDF
Abstract

The UV protection and singlet-oxygen (1O2) quenching activity of intramolecularly hydrogen-bonded hydroxyanthraquinone derivatives found in aloe have been studied by means of laser spectroscopy. The UV protective activity provided by excited-state intramolecular proton-transfer (ESIPT) in these molecules correlates with their 1O2 quenching activity, and the UV protective molecules have high 1O2-quenching function. The reason for this correlation can be understood by considering ESIPT-induced distortion of ground-state potential surfaces in encounter complexes with 1O2.

► Aloe species contain various intramolecularly hydrogen-bonded hydroxyanthraquinones. ► We study their UV protective and 1O2 quenching activities using laser spectroscopy. ► Those two activities positively correlate with each other. ► The reason for this correlation is explained in this paper.

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Physical Sciences and Engineering Chemical Engineering Bioengineering
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