| Lichens--photophysical studies of potential new sunscreens. | |
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MedLine Citation:
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PMID: 19179091 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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:
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Fritz Boehm; Kristy Clarke; Ruth Edge; Ernesto Fernandez; Suppiah Navaratnam; Wanda Quilhot; Fiorenza Rancan; T George Truscott |
Publication Detail:
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Type: Journal Article Date: 2008-12-24 |
Journal Detail:
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Title: Journal of photochemistry and photobiology. B, Biology Volume: 95 ISSN: 1873-2682 ISO Abbreviation: J. Photochem. Photobiol. B, Biol. Publication Date: 2009 Apr |
Date Detail:
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Created Date: 2009-03-18 Completed Date: 2009-07-15 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8804966 Medline TA: J Photochem Photobiol B Country: Switzerland |
Other Details:
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Languages: eng Pagination: 40-5 Citation Subset: IM |
Affiliation:
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Department of Dermatology, Humboldt University, 10117 Berlin, Germany. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Benzofurans
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chemistry*,
isolation & purification,
radiation effects Free Radicals / chemistry, radiation effects Lichens / chemistry* Photolysis Pulse Radiolysis Quantum Theory Singlet Oxygen / metabolism Spectrophotometry, Ultraviolet Sunscreening Agents / chemistry*, isolation & purification, radiation effects |
| Chemical | |
Reg. No./Substance:
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0/Benzofurans; 0/Free Radicals; 0/Sunscreening Agents; 17778-80-2/Singlet Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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