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Sci Rep. 2017 Aug 30;7(1):9944. doi: 10.1038/s41598-017-09637-9.

Lipids, fatty acids and hydroxy-fatty acids of Euphausia pacifica.

Author information

1
Iwate Biotechnology Research Center, 22-174-4 Narita, Kitakami, Iwate, 024-0003, Japan. hyamada@ibrc.or.jp.
2
Life Science Materials Laboratory, ADEKA Corporation, 7-2-34 Higashiogu, Arakawaku, Tokyo, 116-8553, Japan.
3
Iwate Biotechnology Research Center, 22-174-4 Narita, Kitakami, Iwate, 024-0003, Japan.
4
Hachinohe Gakuin University, 13-98 Mihono, Hachinohe, Aomori, 031-8588, Japan.
5
National Research Institute of Aquaculture, Japan Fisheries Reseach and Education Agency, 422-1 Nakatsuhamaura, Minami-ise, Mie, 516-0193, Japan.

Abstract

Euphausia pacifica is a good candidate for a resource of marine n-3 PUFA. However, few reports exist of the lipid and fatty acid composition of E. pacifica. To examine the potential of E. pacifica as a resource of marine n-3 PUFA, we analyzed E. pacifica oil. We extracted lipids from E. pacifica harvested from the Pacific Ocean near Sanriku, Japan. Lipid classes of E. pacifica oil were analyzed by TLC-FID and the fatty acid composition of the oil was analyzed by GC/MS. Free fatty acids and hydroxy-fatty acids were analyzed by LC/QTOFMS. The lipid content of E. pacifica ranged from 1.30% to 3.57%. The ratios of triacylglycerols, phosphatidylcholine, phosphatidylethanolamine and free fatty acids in E. pacifica lipids were 5.3-23.0%, 32.6-53.4%, 8.5-25.4% and 2.5-7.0%, respectively. The content of n-3 PUFA in E. pacifica lipids was 38.6-46.5%. We also showed that E. pacifica contains unusual fatty acids and derivatives: C16-PUFAs (9,12-hexadecadienoic acid, 6,9,12-hexadecatrienoic acid and 6,9,12,15-hexadecatetraenoic acid) and hydroxy-PUFAs (8-HETE and 10-HDoHE). E. pacifica is a good resource of marine n-3 PUFA. Moreover, E. pacifica can provide C16-PUFA and hydroxy-PUFAs.

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