一种海生黄藻的氨基酸和脂肪酸组成

AMINO ACID AND FATTY ACID COMPOSITION OF A MARINE SPECIES OF XANTHOPHYCEAE

对一种海生超微型藻类，品系ＰＰ９８３，的分类学地位、生长和生化组成进行了研究．形态学观察和色素分析表明，ＰＰ９８３ 是一种黄藻．在２５ ℃和１００ μｍｏｌ ｍ － ２ ｓ－１ 的条件下，ＰＰ９８３ 的生长速率为１．１５ ｄｉｖｄ，其对数生长期的蛋白质、脂肪和糖类质量分数分别为干重的４０ ．２％ 、２５ ．０ ％ 和１１ ．１％ ；共检出了１７ 种氨基酸，其总量为干重的２７．８ ％ ．ＰＰ９８３ 的多不饱和脂肪酸（ＰＵＦＡｓ）占总可提取脂肪酸的２６．４％ ，其中主要是ＥＰＡ，占干重的４．６％ ，而ＤＨＡ未检出．结果显示，ＰＰ９８３ 不仅可作为海生动物的优良饵料。

Biochemical composition and growth characteristics of a marine picoalgae strain PP983 belonging to Xanthophyceae in morphology and pigment composition were determined. At logarithmic phase, the alga contained 40.2% protein, 11.1% carbohydrate and 25.0% lipid in dry weight and the growth rate was 1.15 div/day under 25℃, 100 μ mol m -2 s -1 . 17 amino acids were detected with total weight of 278.0 mg g -1 dried cells. The polyunsaturated fatty acids (PUFAs) accounted for about 26.4% of the total fatty acids, the EPA as primary fatty acids for 46% of the dried cells, and no DHA was detected. The results show that strain PP983 is not only an excellent food for mariculture, but also a potential source for producing EPA.