Abstract
In order to identify new structures, the free fatty acids from an extract of a glass sponge Aulosaccus sp. (from the north-west Pacific) belonging to one of the least chemically investigated classes (Hexactinellida), were fractionated by RP-HPLC and analyzed by NMR spectroscopy and GC–MS of their pyrrolidine derivatives, methyl(ethyl) esters and their dimethyl disulfide adducts. One hundred and twenty-three C12–C31 acids (including nine new compounds) were detected, one hundred and ten of these compounds have not been found previously in glass sponges. The levels of common methylene-interrupted polyenes, monoenes of the (n–7) family and less common branched-chain components proved to be high. New acids were shown to be 5,13-dimethyl-tetradec-4-enoic, cis-10,11-methylene-heptadecanoic, 10,12-dimethyl-octadecanoic, cis-12,13-methylene-nonadecanoic, (14E)-13-methyl-eicos-14-enoic, 19-methyl-eicos-13-enoic, cis-20,21-methylene-heptacosanoic, 27-methyl-octacos-21-enoic and (22Z)-nonacos-22-enoic. Some important mass spectrometric characteristics of pyrrolidides of homologous cyclopropane fatty acids are reported and discussed.
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Abbreviations
- FA:
-
Fatty acid(s)
- GC–MS:
-
Gas chromatography–mass spectrometry
- RP-HPLC:
-
High-performance liquid chromatography in the reversed-phase mode
- NMR:
-
Nuclear magnetic resonance
- DMDS:
-
Dimethyl disulfide
- MS:
-
Mass spectrum(spectra)
- RT:
-
Retention time
- ECL:
-
Equivalent chain length
- PUFA:
-
Polyunsaturated fatty acid(s)
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Acknowledgements
The authors express their gratitude to Drs O.P. Moiseenko, L.P. Ponomarenko for their kind help in GC–MS analyses and Prof. V.A. Stonik for reading the manuscript and discussion.
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Santalova, E.A., Denisenko, V.A. Fatty Acids from a Glass Sponge Aulosaccus sp. Occurrence of New Cyclopropane-Containing and Methyl-Branched Acids. Lipids 52, 73–82 (2017). https://doi.org/10.1007/s11745-016-4214-1
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DOI: https://doi.org/10.1007/s11745-016-4214-1