期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
卷 95, 期 1, 页码 40-45出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2008.12.008
关键词
Lichens; Pulse radiolysis; Laser flash photolysis; Sunscreens; Free radicals; Singlet oxygen
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. (C) 2008 Elsevier B.V. All rights reserved.
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