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Lichens – Photophysical studies of potential new sunscreens

Paper ID Volume ID Publish Year Pages File Format Full-Text
31115 44547 2009 6 PDF Available
Title
Lichens – Photophysical studies of potential new sunscreens
Abstract

Fundamental photophysical properties have been obtained for six polyaromatics, calycine, usnic acid, vicanicine, 1-Cl-pannerine and epiphorelic acids I and II, extracted from Antarctic lichens – potential future sunscreens. None of the lichen compounds produced a measurable amount of triplet states and the singlet oxygen quantum yield was also very low ranging from 0.003 to 0.06. However, three exhibited triplet energy levels which may be above that of thymine. The radical cations of calycine and usnic acid were generated via pulse radiolysis and were observed to be quenched by vitamin C, vitamin E and Trolox.

Keywords
Lichens; Pulse radiolysis; Laser flash photolysis; Sunscreens; Free radicals; Singlet oxygen
First Page Preview
Lichens – Photophysical studies of potential new sunscreens
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 95, Issue 1, 2 April 2009, Pages 40–45
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering