Total lipid and omega-3 fatty acid composition of two indigenous Dunaliella (CH2 and SH33) in response to the extremely high CO2 concentration

The incessant rise of greenhouse gas emission has led to global warming and climate change. Global concern on this phenomenon has suggested the microalgae-based CO2sequestration for diminishing greenhouse effects. Microalgae have recently gained enormous attention worldwide, to be the valuable feedstock for renewableenergy production, due to their high growth rates, high lipid productivities and the ability to sequester carbon. In this paper, the effect of extremely high CO2 concentration on contents of total lipid, lipid productivity, omega-3 fatty acids on two indigenous Dunaliella (CH2, SH33)microalgae was investigated. We exposed two indigenous isolates of Dunaliella (CH2, SH33) to 0.03%, 10%, 20%, and 30% CO2 concentrations. Results demonstrated that increasing CO2 concentrations developed in the sharp increase of the total lipid content in both isolates. Lipid productivity increased significantly with Co2 rising. In addition, unsaturated fatty acids and thereby the total omega-3 fatty acid content of our studied isolates increased considerably with the rise of CO2 concentration. As stated by results, in microalgae Dunaliella (CH2, SH33)CO2 mitigation can be an effective conversion of CO2 to value-added products

Keywords:

Extremely high CO2 concentration , CO2 mitigation , Dunaliella (CH2 and SH33)