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水产动物食品中富含ω—3型多稀酸,其中尤其是C_(20:5)(EPA)和C_(22:6)(DHA)对人体有特殊保健功能。本文对七种常见的甲壳类水产品进行脂肪酸组成分析,它们是中国对虾、日本沼虾、安氏白虾、克氏原螫虾、葛氏长臂虾、中华绒螯蟹和三寺疣梭子蟹。测定主要采用黄志斌、李淡秋(1990)的“快速制备脂肪酸甲酯用于气相色谱分析”一文所提供的方法。结果显示,被测样品中不饱和脂肪酸含量高于饱和脂肪酸,而不饱和脂肪酸中多烯酸含量高达60%,且以长碳链(C_(20)、C_(22))ω—3型为特征,表明甲壳类水产品体脂中EPA和DHA含量甚高,超过淡水鱼的一倍,但略逊于海水鱼。值得注意的是,甲壳类水产品中EPA的含量高于DHA的含量,这与鱼类中的情况正好相反。
Aquatic animal food is rich in omega-3 fatty acids, especially C_ (20: 5) (EPA) and C_ (22: 6) (DHA). In this paper, fatty acid composition analysis of seven common crustacean aquatic products is carried out. They are Chinese shrimp, Macrobrachium rosenbergii, White shrimp, Przewalski’s shrimp, Gekko gecko, Eriocheir sinensis and Portunus trituberculatus. Determination of the main use of Huang Zhibin, Li Danqiu (1990) “rapid preparation of fatty acid methyl ester for gas chromatography” article provides the method. The results showed that the content of unsaturated fatty acids in samples was higher than that of saturated fatty acids, while the content of polyunsaturated acids in unsaturated fatty acids was as high as 60%. The long chain fatty acids (C_ (20) and C_ (22)) were Characteristics, indicating that shellfish aquatic products EPA and DHA content is very high, more than double the freshwater fish, but slightly worse than the marine fish. It is noteworthy that the content of EPA in crustacean aquatic products is higher than that of DHA, which is the opposite of that in fish.