Effect of different CO2 concentrations on biomass, pigment content, and lipid production of the marine diatom <italic>Thalassiosira pseudonana</italic>.

The marine diatom <italic>Thalassiosira pseudonana</italic> 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 <italic>T</italic>. <italic>pseudonana</italic>. Interestingly, lipid content doubled when air was enriched with 1–5% CO2. Moreover, the analysis of the fatty acid composition of <italic>T</italic>. <italic>pseudonana</italic> 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 <italic>T</italic>. <italic>pseudonana</italic> seems to be an ideal candidate for biodiesel production using flue gases. [ABSTRACT FROM AUTHOR]