封闭循环流水养殖的花鳗鲡脂肪酸特征分析

为探寻封闭循环流水养殖模式下养殖的较大型(≥2 kg)花鳗鲡(Anguilla marmorata)各可食部的脂肪酸特征,利用索氏抽提法获得各部位的粗脂肪,以37种脂肪酸甲酯混标标准品为标准,气相色谱外标法检测脂肪酸的组成。检测结果显示,鱼皮中粗脂肪含量最高为26.96%,鱼肉的粗脂肪含量为10.36%;不同可食部的脂肪酸组成基本相似,饱和脂肪酸9种,单不饱和脂肪酸6种,多不饱和脂肪酸8种,饱和脂肪酸、单不饱和脂肪酸和多不饱和脂肪酸间的比例大约都为1∶3∶1,三大类脂肪酸中含量最高的分别为软脂酸C16∶0、油酸C18∶1n9c和二十二碳六烯酸C22∶6n3,油酸在不同可食部中均超过20 g/100 g总脂,C22∶6n3(DHA)在不同可食部中含量在4.42~5.59 g/100 g总脂之间。研究表明,较大型花鳗鲡是人体所需脂肪酸的良好食物来源。

Characterization of fatty acids of Anguilla marmorata cultured in a closed recirculating flow-water culture system

To characterize the fatty acids in various edible parts of large-size Anguilla marmorata (≥2 kg ) cultured in a closed recirculating flow-water culkture system , crude fat was extracted by Soxhlet extraction method, and then the contents of fatty acids were determined by Gas Chromatography ( GC) with a external standard that consists of 37 methyl fatty acids .The results indicated that there was highest amounts of crude fat (26.96%) in fish skin, and 10.36% in fish flesh.Different edible parts in this study showed similar composition of fatty acids , the proportion of different saturated fatty acids ( SFAs ) to monounsaturated fatty acids ( MUFAs) and polyunsaturated fatty acids ( PUFAs ) were approximately 1∶3∶1 .The highest contents found in SFAs, MUFAs and PUFAs were palmitic acid (C16∶0), oleic acid (C18∶1n9c) and docosahexaenoic acid (C22∶6n3) respectively.The content of oleic acid which was named Safe Fatty Acid by nutriology fields in various edible parts were over 20 g/100 g of lipids, the content of docosahexaenoic acid which was known as DHA in various edible parts were between 4.42 g/100 g and 5.59 g/100 g of lipids.To conclude, Anguilla marmorata weighed over 2kg was a good food source for the intake of dietary fatty acids .