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New and Uncommon Fatty Acids in Lipids of Deep-Sea Foraminifera

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Lipids

Abstract

Fatty acids (FA) of agglutinating foraminifera of two genera, Bathysiphon and Rhabdammina, collected from a depth of 3307–3377 m in the Kuril Basin, Sea of Okhotsk, and adjacent deep-sea waters of the Pacific Ocean, were analyzed. In lipids of two Bathysiphon species, in addition to common FA typical for marine organisms, the uncommon ∆4 and ∆7 monoenoic acids and ∆4,7-dienoic acid were found in noticeable amounts. FA of two Rhabdammina species included also such uncommon acids as ∆5,8,11,14–21:4, ∆5,8,11,14–22:4, and ∆5,8,11,14–23:4, which are homologues to arachidonic acid. High levels of cis-vaccenic and arachidonic acids were typical for lipids of all the studied species. At the same time, we observed a substantial difference in FA composition between members of these two genera. Using GC and GC–MS of FAME, pyrrolidide and DMOX derivatives, the structures of 10 new FA were confirmed: ∆4-i-16:1 (1.1–0.6%), ∆7-i-21:1 (0.4%), ∆7-ai-21:1 (0.3–0.8%), ∆4,11–18:2 (0.3–0.9%), ∆4,7–20:2 (8.8%), ∆7,12–20:2 (0.4–0.6%), ∆4,7–21:2 (0.6%), ∆7,12–22:2 (6.4–2.1%); ∆5,8,11,14–22:4 (1.2–2.0%), and ∆5,8,11,14–23:4 (1.7–2.3%). The origin of the new FA and the role of foraminifera FA in deep-sea communities are discussed.

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Abbreviations

ARA:

Arachidonic acid

DMOX:

4,4-Dimethyloxazoline derivatives

FA:

Fatty acid(s)

FAME:

Fatty acid methyl esters

GC:

Gas chromatography

GC–MS:

Gas chromatography–mass spectrometry

NMID:

Non-methylene interrupted dienoic

PUFA:

Polyunsaturated fatty acids

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Acknowledgements

We are grateful to the captain and the crew of the R/V Academic M.A. Lavrentyev. We thank all members of the expedition for their cooperation. This work was supported by a research grant of the Far Eastern Branch of the Russian Academy of Sciences (No. 15-I-6-056 to A.V. Adrianov). A systematic study of benthic foraminifera by T.S. Tarasova was supported by the Russian Foundation for Basic Research (Grant No. 15-0403553). This is SokhoBio publication #2.

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Correspondence to Vasily I. Svetashev.

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Kharlamenko, V.I., Svetashev, V.I. & Tarasova, T.S. New and Uncommon Fatty Acids in Lipids of Deep-Sea Foraminifera. Lipids 52, 345–352 (2017). https://doi.org/10.1007/s11745-017-4237-2

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