Abstract
The effects of trace elements on the lipid productivity and fatty acid composition ofNannochloropis 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 Fe3+, Zn2+, Mn2+, Mo6+, and EDTA and the deletion of Cu2+and Co2+can increase the lipid productivity. The optimum concentrations of the trace elements in the culture medium are 6 times of Fe3+and EDTA, the same concentration of Zn2+, Mn2+, and Mo6+as the control group, but the optimum medium has no Cu2+or Co2+. Fe3+, Zn2+, Mn2+, Mo6+, and EDTA are indispensable during the EPA formation ofN. oculata. The addition of Fe3+, Zn2+, Mn2+, Mo6+, and EDTA can strongly increase the content of EPA in the lipid ofN. oculata, but the concentration of the trace elements had little influence on the level of EPA.
Highlights
In order to reduce the cost of biodiesel from microalgae, we can screen out the algal species that both grow well and have high lipid content and explore the optimal culture condition to improve the lipid productivity of microalgae
N. oculata is a promising source of biodiesel because of its high growth rate and high lipid content, ranging from 31% to 68% [1]
Yamochi [7] found that the addition of EDTA which could form a complex with many kinds of metal ions would promote the absorption of metal ions of microalgae and the growth of microalgae, and the complex iron was the inducement of red tide in the nutrition water
Summary
In order to reduce the cost of biodiesel from microalgae, we can screen out the algal species that both grow well and have high lipid content and explore the optimal culture condition to improve the lipid productivity of microalgae. Apart from the macroelements such as N, P, and C, the growth rate and lipid content of N. oculata can be affected by trace elements This is because trace elements are indispensable during the growing process of marine algae, and trace elements are indispensable parts of the algal cell itself and the enzyme active center of algal cell [2, 3]. Too high or too low concentrations of Mo6+ were both harmful to the growth of Dunaliella salina Their researches showed that trace elements had some effects on the growth density and lipid content of microalgae, but the effects of trace elements on the lipid productivity and fatty acid composition of N. oculata have not been reported yet. The optimum dosage of trace elements that will increase the lipid productivity of N. oculata was determined
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