Effects of additional Mg²⁺ on the growth, lipid production, and fatty acid composition of Monoraphidium sp. FXY-10 under different culture conditions
2014
Huang, Li | Xu, Junwei | Li, Tao | Wang, Lin | Deng, Tao | Yu, Xuya
The effects of supplementing the culture medium with Mg²⁺ on the growth, lipid production, and fatty acid composition of Monoraphidium sp. FXY-10 were studied under photoautotrophic, heterotrophic, and mixotrophic conditions. Under the photoautotrophic condition, microalgae supplemented with 100 μM Mg²⁺ grew significantly better than the control group and exhibited a secondary growth state. The final cell density was 1.25-fold higher than that of the control group (2.98 g L⁻¹), and the peak lipid content reached 59.8 % (control group 52.3 %). Culture under the heterotrophic condition did not significantly increase the growth rate, but the experimental group (100 μM Mg²⁺ supplementation) achieved a 37.03 % lipid content compared to 28.47 % by the control group. The lipid productivity of the experimental group (100 μM Mg²⁺ supplementation) was higher, reaching 65.93 mg L⁻¹ day⁻¹ compared with 56.10 mg L⁻¹ day⁻¹ for the group without additional Mg²⁺. Under the mixotrophic condition, the experimental group achieved a final density of 3.10 g L⁻¹, which was higher than that of the control group (2.98 g L⁻¹). There was also no variation in fatty acid composition between the experimental group and the control group. Under the heterotrophic and mixotrophic conditions, the experimental group produced more than 50% saturated fatty and mono-unsaturated fatty acids, and the degree of unsaturation was <137. This result was relatively lower than that of the control.
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