Abstract
A new fatty acid, (5Z,9Z)-22-methyl-5,9-tetracosadienoic acid (1a), and a rare fatty acid, (5Z,9Z)-23-methyl-5,9-tetracosadienoic acid (2a), the predominant constituents of the free fatty acid fraction from the lipids of the sponge Geodinella robusta, were isolated and partly separated by reversed phase high-performance liquid chromatography, followed by multifold crystallization from MeOH to give 1a and 2a in 70% and 60% purity, respectively. These fatty acids were identified as (5Z,9Z)-22-and (5Z,9Z)-23-methyl-5,9-tetracosadienoic acids by nuclear magnetic resonance techniques, including distortionless enhancement by polarization transfer, heteronuclear multiple quantum connectivity, and correlation spectroscopy experiments, as well as from mass-spectrometric data for their methyl esters, the methyl esters of their perhydro derivatives, and their pyrrolidides. Mixtures of 1a and 2a showed cytotoxic activity against mouse Ehrlich carcinoma cells and a hemolytic effect on mouse erythrocytes. The sterol fraction from the same sponge was analyzed by gas liquid chromatography mass spectrometry, and 24-methylenecholesterol was identified as a main constituent of this fraction. The implications of the co-occurrence of membranolytic long-chain fatty acids and 24-methylenecholesterol as a main membrane sterol are discussed in terms of the phenomenon of biochemical coordination.
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Abbreviations
- GOSY:
-
correlation spectroscopy
- ECL:
-
equivalent chain length
- EI-MS:
-
electron impact mass spectrometry
- GLC:
-
gas-liquid chromatography
- GLC-MS:
-
gas-liquid chromatography coupled with mass spectrometry
- HPLC:
-
high-performance liquid chromatography
- NMR:
-
nuclear magnetic resonance
- TLC:
-
thin-layer chromatography
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Makarieva, T.N., Santalova, E.A., Gorshkova, I.A. et al. A new cytotoxic fatty acid (5Z,9Z)-22-methyl-5,9-tetracosadienoic acid and the sterols from the far Eastern sponge Geodinella robusta . Lipids 37, 75–80 (2002). https://doi.org/10.1007/s11745-002-0866-6
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DOI: https://doi.org/10.1007/s11745-002-0866-6