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Effect of different CO2 concentrations on biomass, pigment content, and lipid production of the marine diatom Thalassiosira pseudonana

Sabia, Alessandra, Clavero, Esther, Pancaldi, Simonetta, Salvadó Rovira, Joan
Applied microbiology and biotechnology 2018 v.102 no.4 pp. 1945-1954
Bacillariophyceae, Thalassiosira pseudonana, air, biodiesel, biomass production, carbon dioxide, flue gas, fuel production, lipid content, polyunsaturated fatty acids
The marine diatom Thalassiosira pseudonana grown under air (0.04% CO₂) and 1 and 5% CO₂ concentrations was evaluated to determine its potential for CO₂ mitigation coupled with biodiesel production. Results indicated that the diatom cultures grown at 1 and 5% CO₂ showed higher growth rates (1.14 and 1.29 div day⁻¹, respectively) and biomass productivities (44 and 48 mgAFDWL⁻¹ day⁻¹) than air grown cultures (with 1.13 div day⁻¹ and 26 mgAFDWL⁻¹ day⁻¹). The increase of CO₂ resulted in higher cell volume and pigment content per cell of T. pseudonana. Interestingly, lipid content doubled when air was enriched with 1–5% CO₂. Moreover, the analysis of the fatty acid composition of T. pseudonana revealed the predominance of monounsaturated acids (palmitoleic-16:1 and oleic-18:1) and a decrease of the saturated myristic acid-14:0 and polyunsaturated fatty acids under high CO₂ levels. These results suggested that T. pseudonana seems to be an ideal candidate for biodiesel production using flue gases.