马尾藻属物种中具有Δ5不饱和键的非亚甲基间断脂肪酸。

Non-methylene-interrupted fatty acids with Δ5 unsaturation in Sargassum species.

作者信息

Kim Gwang-Woo, Itabashi Yutaka

机构信息

Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Japan.

出版信息

J Oleo Sci. 2012;61(6):311-9. doi: 10.5650/jos.61.311.

DOI:10.5650/jos.61.311

PMID:22687776

Abstract

Detailed fatty acid compositions of five species of the brown algae Sargassum (S. fulvellum, S. horneri, S. boreale, S. thunbergii, and S. yezoense) were determined using silver ion solid phase extraction, gas chromatography (GC), and GC-mass spectrometry (GC-MS) techniques. In addition to a high number of typical saturated and unsaturated fatty acids, the GC-MS spectra of the 4,4-dimethyloxazoline derivatives of fatty acids revealed the occurrence of small amounts of unusual non-methylene-interrupted (NMI) fatty acids with Δ5 unsaturation, namely, 5,9-eicosadienoic (5,9-20:2), 5,11,14-eicosatrienoic (5,11,14-20:3), and 5,11,14,17-eicosatetraenoic (5,11,14,17-20:4) acids. Of these three NMI acids, the 5,9-20:2 acid was found to be the most abundant (0.4%-2.3% of the total fatty acids) and was detected for the first time in algae.

摘要

采用银离子固相萃取、气相色谱（GC）和气相色谱-质谱联用（GC-MS）技术，测定了五种马尾藻属褐藻（半叶马尾藻、鼠尾藻、北方马尾藻、海黍子和叶状马尾藻）的详细脂肪酸组成。除了大量典型的饱和脂肪酸和不饱和脂肪酸外，脂肪酸的4,4-二甲基恶唑啉衍生物的GC-MS谱图显示，存在少量具有Δ5不饱和度的异常非亚甲基间断（NMI）脂肪酸，即5,9-二十碳二烯酸（5,9-20:2）、5,11,14-二十碳三烯酸（5,11,14-20:3）和5,11,14,17-二十碳四烯酸（5,11,14,17-20:4）。在这三种NMI酸中，5,9-20:2酸含量最高（占总脂肪酸的0.4%-2.3%），且首次在藻类中被检测到。