The Effects of Trace Elements on the Lipid Productivity and Fatty Acid Composition of<i>Nannochloropis oculata</i>

Abstract

The effects of trace elements on the lipid productivity and fatty acid composition of Nannochloropis oculata (N. oculata) were studied. The results showed that trace elements had a strong influence on not only the lipid productivity but also the fatty acid composition. The addition of Fe 3+ , Zn 2+ , Mn 2+ , Mo 6+ , and EDTA and the deletion of Cu 2+ and Co 2+ can increase the lipid productivity. The optimum concentrations of the trace elements in the culture medium are 6 times of Fe 3+ and EDTA, the same concentration of Zn 2+ , Mn 2+ , and Mo 6+ as the control group, but the optimum medium has no Cu 2+ or Co 2+ . Fe 3+ , Zn 2+ , Mn 2+ , Mo 6+ , and EDTA are indispensable during the EPA formation of N. oculata . The addition of Fe 3+ , Zn 2+ , Mn 2+ , Mo 6+ , and EDTA can strongly increase the content of EPA in the lipid of N. oculata , but the concentration of the trace elements had little influence on the level of EPA.