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rdf:type |
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lifeskim:mentions |
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pubmed:issue |
2-3
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pubmed:dateCreated |
2001-12-17
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pubmed:abstractText |
Lipofuscin is thought to be involved in age-related macular degeneration as is one of its proposed components, an amphiphillic pyridinium-based bis-retinoid with a quaternary nitrogen atom, known as A2-E. We report the triplet state spectra obtained from photosensitisation using anthracene and 1-nitronaphthalene in benzene and methanol. The triplet state of A2-E has lambda(max) at 550 nm and a lifetime of approximately 30 micros, it is efficiently quenched by molecular oxygen with a second-order quenching rate constant of approximately 1 x 10(9) dm(3) mol(-1) s(-1). There is no significant triplet state formation from direct laser excitation of A2-E and hence its quantum yield of triplet state formation must be <0.01.
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pubmed:language |
eng
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pubmed:journal |
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pubmed:citationSubset |
IM
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pubmed:chemical |
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pubmed:status |
MEDLINE
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pubmed:month |
Nov
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pubmed:issn |
1011-1344
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pubmed:author |
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pubmed:issnType |
Print
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pubmed:day |
15
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pubmed:volume |
64
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
162-5
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pubmed:dateRevised |
2007-7-23
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pubmed:meshHeading |
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pubmed:year |
2001
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pubmed:articleTitle |
Photochemical studies of A2-E.
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pubmed:affiliation |
School of Chemistry and Physics, Lennard-Jones Laboratories, Keele University, Staffordshire ST5 5BG, UK. a.cantrell@chem.keele.ac.uk
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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