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研究了一种重要的海洋微量元素铁对等鞭金藻(Isochrysis galbana)生长和脂肪酸组成的影响。研究结果表明,等鞭金藻在天然海水中(铁浓度为0.5μmol/L)生长缓慢,但当培养基中Fe3+ 浓度超过12.5 μmol/L时,等鞭金藻生长差异不显著。C18:2(n-6)和C18:3(n-6)占总脂肪酸的比例随着Fe3+浓度增加而下降,但C22:6(n-6)(DHA)随着Fe3+浓度增加而上升。Fe3+浓度在12.5-120.5 μnol/L,多不饱和脂肪酸(PUFA)占总脂肪酸的比例显著下降(P<0.05)。DHA和PUFA含量(W/ W)随着Fe3+浓度的增加先上升后下降.二者达到最大值时Fe3+浓度分别为60.5和24.5 μmol/L。
The effect of an important marine trace element iron on the growth and fatty acid composition of Isochrysis galbana was studied. The results showed that Isochrysis galbana grew slowly in natural seawater (iron concentration 0.5μmol / L), but the growth of Isochrysis galbana was not significant when the concentration of Fe3 + in the medium was more than 12.5 μmol / L. The ratio of C18: 2 (n-6) and C18: 3 (n-6) to total fatty acids decreased with the increase of Fe3 + concentration, but C22: 6 (n-6) (DHA) increased with the increase of Fe3 + concentration. Fe3 + concentration of 12.5-120.5 μnol / L, the ratio of PUFA to total fatty acids decreased significantly (P <0.05). The content of DHA and PUFA (W / W) firstly increased and then decreased with the increase of Fe3 + concentration, and reached the maximum at 60.5 and 24.5 μmol / L, respectively.