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首页> 外文期刊>Fisheries Science >Occurrence of all-cis-5,8,11,14,17,20,23-hexacosaheptaenoic acid (26:7n-3) in roughscale sole Clidoderma asperrimum flesh lipids
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Occurrence of all-cis-5,8,11,14,17,20,23-hexacosaheptaenoic acid (26:7n-3) in roughscale sole Clidoderma asperrimum flesh lipids

机译：全顺式单一曲霉皮曲霉肉脂中全顺式5、8、11、14、17、20、23-六庚庚烯酸（26：7n-3）的发生

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Fatty acid analysis of roughscale sole Clidoderma asperrimum flesh lipids was carried out by gas chromatography. An unidentified peak appeared in the chromatogram in the elution region of ≥C24 fatty acids. After enrichment by solvent partitioning, reversed-phase thin-layer chromatography (TLC), and argentation TLC, the peak component was subjected to structural analyses. The partially hydrogenated products after reaction with hydrazine hydrate gave seven isomers of cis-hexacosenoic acid (26:1). Gas chromatography-mass spectrometry (GC–MS) analyses of their dimethyl disulfide adducts identified the monounsaturates as 5-, 8-, 11-, 14-, 17-, 20-, and 23-26:1. The peak component was assigned to all-cis-5,8,11,14,17,20,23-hexacosaheptaenoic acid (26:7n-3). GC–MS analyses of the 4,4-dimethyloxazoline derivative and methyl ester confirmed this structure. This fatty acid is a rare, very long-chain polyunsaturated fatty acid (VLCPUFA). The concentrations of the acid found in roughscale sole were 0.69 ± 0.34% (N = 5) of total fatty acids in flesh lipids. Roughscale sole appears to be characterized by the occurrence of 26:7n-3, which is lacking in popular sources of methylene-interrupted VLCPUFA, such as vertebrate retina, spermatozoa, and herring.
机译：通过气相色谱法对粗糙的唯一的曲霉皮肤曲霉肉脂进行脂肪酸分析。色谱图中在≥C24脂肪酸的洗脱区域中出现一个不确定的峰。通过溶剂分配，反相薄层色谱（TLC）和银联TLC富集后，对峰组分进行结构分析。与水合肼反应后，部分氢化的产物得到顺式-己烯酸的七个异构体（26：1）。气相色谱-质谱法（GC-MS）对他们的二甲基二硫键加合物的分析确定单不饱和物为5、8、11、14、17、20和23-26：1。峰组分被指定为全顺式5,8,11,14,17,20,23-六庚庚烯酸（26：7n-3）。对4,4-二甲基恶唑啉衍生物和甲酯的GC-MS分析证实了这种结构。这种脂肪酸是一种罕见的，非常长链的多不饱和脂肪酸（VLCPUFA）。在粗皮鞋底中发现的酸浓度为肉脂中总脂肪酸的0.69±0.34％（N = 5）。粗糙的鞋底似乎以26：7n-3的出现为特征，这在亚甲基干扰的VLCPUFA的流行来源中缺乏，例如脊椎动物的视网膜，精子和鲱鱼。

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