目的：用毛细管气相色谱法测定海狗油中二十碳五烯酸（EPA）、二十二碳五烯酸（DPA）和二十二碳六烯酸（DHA）的含量。
Objective: To determine the contents of eicosapentaenoic acid (EPA) , docosapentaenoic acid (DPA) and docosahexaenoic acid(DHA)in harp seal oil by capillary gas chromatography.
虽然人体可以自动将 α-亚麻酸（ALA）转换成 二十碳五烯酸（EPA）和二十二碳六烯酸（DHA） ，但转换率很低，人们需要食用大量含有 α-亚麻酸（ALA）的食品才行，这种做法可行性不高。
Although human can convert alpha-linolenic acid(ALA)to EPA and DHA, the conversion rate is so low, you need eat a lot of food contain ALA, that's make it impractical.
用尿素沉淀法和分子蒸馏法研究了二十碳五烯酸(简称e P A)、二十二碳六烯酸(简称d H A)乙酯的分离提纯。
In this study, urea inclusion method and molecular distillation method were applied in the purifications of ethyl ester of EPA and DHA.
多不饱和脂肪酸（PUFA）含量丰富，其中二十碳五烯酸（EPA）和二十二碳六烯酸（DHA）含量相当高，占总脂肪的25．26％-27．21％。
Thecontents of polyunsaturated fatty acids (PUFA), EPA and DHA compose 25.26% to27.21% of the total lipid. EPA and DHA contents in soft body, digestive gland andgonad are insignificantly different.
多不饱和脂肪酸（PUFA）含量丰富，其中二十碳五烯酸（EPA）和二十二碳六烯酸（DHA）含量相当高，占总脂肪的25．26％-27．21％。
Thecontents of polyunsaturated fatty acids (PUFA), EPA and DHA compose 25.26% to27.21% of the total lipid. EPA and DHA contents in soft body, digestive gland andgonad are insignificantly different.
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