Phytochemical Investigation of the Australian Lichens <i>Ramalina glaucescens</i> and <i>Xanthoria parietina</i>
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- Daniel A. Dias
- School of Applied Sciences (Discipline of Applied Chemistry), RMIT University, GPO Box 2476V Melbourne 3001, Victoria, Australia
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- Sylvia Urban
- School of Applied Sciences (Discipline of Applied Chemistry), RMIT University, GPO Box 2476V Melbourne 3001, Victoria, Australia
説明
<jats:p> Phytochemical investigation of the Australian lichen, Ramalina glaucescens resulted in the isolation of a new halogenated depside, 5-chlorosekikaic acid 5, together with (+)-usnic acid 1, sekikaic acid 2, atranorin 6 and parietin 7, the latter of which was isolated from the associated (co-occurring) lichen, X. parietina. Compound 5 is suspected to be an artifact of the isolation procedure. All structures were assigned using spectroscopic methods and mass spectrometry. In addition to the full characterization of 5, this report represents the first application of 2D NMR spectroscopy to complete the unequivocal chemical shift assignment for compounds 2 and 7. Compounds 1-2 and 5-7 all displayed varying degrees of antitumor activity (ranging from an IC<jats:sub>50</jats:sub> of 15 μM to >44 μM) with compounds 1, 2 and 5 also displaying antibacterial properties. Of these, (+)-usnic acid 1 displayed the most significant antitumor and antibacterial activities. </jats:p>
収録刊行物
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- Natural Product Communications
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Natural Product Communications 4 (7), 1934578X0900400-, 2009-07
SAGE Publications
