Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
31115 | Journal of Photochemistry and Photobiology B: Biology | 2009 | 6 Pages |
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.
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Authors
Fritz Boehm, Kristy Clarke, Ruth Edge, Ernesto Fernandez, Suppiah Navaratnam, Wanda Quilhot, Fiorenza Rancan, T. George Truscott,