Novel tri- and tetra-unsaturated highly branched isoprenoid (HBI) alkenes from the marine diatom Pleurosigma intermedium
Date
2016-01Author
Brown, TA
Belt, ST
Subject
Biomarkers Hydrocarbons Highly branched isoprenoid Alkene Diatom Pleurosigma intermedium
Metadata
Show full item recordAbstract
Two previously uncharacterised C25 highly branched isoprenoid (HBI) alkenes have been identified in a laboratory culture of the diatom Pleurosigma intermedium and their structures determined using a combination of NMR spectroscopy and gas chromatography-mass spectrometry (GC-MS). These new tri- and tetra-unsaturated HBI alkenes are stereoisomers of previously characterised HBIs, with a Z stereochemistry for the C5-C6 double bond in each case. HBIs with an isomeric (E/Z) C5-C6 double bond and with 1-4 double bonds, in total, have extremely similar mass spectra and a consistent difference in retention index (ΔRI 28), with a Z before E elution order in all cases.
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Publisher
Elsevier BV
Journal
ORGANIC GEOCHEMISTRY
Volume
91
Pagination
120-122
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