Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10687515 | Algal Research | 2014 | 6 Pages |
Abstract
The total lipid and FAME concentrations increased under nitrate limitation in both microalgae. The results reflected the dynamic changes in the syntheses of fatty acid (FA) under stress in the studied algae. Between the two algae studied, T. gracilis had the highest percentage of eicosapentaenoic acid (EPA: 14.0%) and eicosatetraenoic acid (ETA: 3.1%) at 0.05 g lâ 1 nitrate concentration. The maximum EPA (4.4%) and ETA (2.0%) concentrations in P. convolutae were observed in the total polyunsaturated fatty acids (PUFAs) grown at a nitrate concentration of 0.1 g lâ 1 in the culture media under outdoor conditions. The major PUFAs detected under different carbon supplements were C20:4 (Ï3), C20:5 (Ï3) and C20:4 (Ï6). T. gracilis had the highest amount of EPA (14.7%) under photoheterotrophic growth with glucose (2 g lâ 1) as the carbon source. The optimal condition for EPA production by P. convolutae (8%) was 1 g lâ 1 glucose at 12-h light photoperiod under indoor mass cultivation and photoheterotrophic growth. These two microalgae had high lipid contents and showed a higher PUFA level under nitrate limitation. This result shows that biomass, lipids, and fatty acids as well as PUFA accumulate and reach elevated levels in these two microalgae species under photoheterotrophic growth conditions.
Keywords
Related Topics
Physical Sciences and Engineering
Energy
Renewable Energy, Sustainability and the Environment
Authors
Palanisamy Selvakumar, Katru Umadevi,