Seasonal Variation of Lipids and Fatty Acids of the Microalgae Nannochloropsis oculata Grown in Outdoor Large-Scale Photobioreactors
| Type | Article | ||||||||
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| Date | 2012-05 | ||||||||
| Language | English | ||||||||
| Author(s) | Olofsson Martin1, Lamela Teresa2, Nilsson Emmelie1, Berge Jean-Pascal 3, Del Pino Victoria2, Uronen Pauliina4, Legrand Catherine1 |
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| Affiliation(s) | 1 : Linnaeus Univ, Ctr Ecol & Evolut Microbial Model Syst EEMiS, S-39182 Kalmar, Sweden. 2 : Necton SA, P-8700152 Olhao, Portugal. 3 : IFREMER, Lab Sci & Technol Marine Biomass STBM, F-44311 Nantes 3, France. 4 : Neste Oil, Espoo 00095, Finland. |
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| Source | Energies (1996-1073) (MDPI), 2012-05 , Vol. 5 , N. 5 , P. 1577-1592 | ||||||||
| DOI | 10.3390/en5051577 | ||||||||
| WOS© Times Cited | 97 | ||||||||
| Keyword(s) | biodiesel, microalgae, seasonal variation, Nannochloropsis oculata, large-scale, lipids, fatty acids, light, temperature | ||||||||
| Abstract | While focus in oil-producing microalgae is normally on nutrient deficiency, we addressed the seasonal variations of lipid content and composition in large-scale cultivation. Lipid content, fatty acid profiles and mono- di- and triglycerides (MAGs, DAGs, and TAGs) were analyzed during May 2007-May 2009 in Nannochloropsis oculata grown outdoors in closed vertical flat panels photobioreactors. Total lipids (TL) ranged from 11% of dry weight (DW) in winter to 30% of DW in autumn. 50% of the variation in TL could be explained by light and temperature. As the highest lipid content was recorded during autumn indicating an optimal, non-linear, response to light and temperature we hypothesize that enhanced thylakoid stacking under reduced light conditions resulted in more structural lipids, concomitantly with the increase in glycerides due to released photo-oxidative stress. The relative amount of monounsaturated fatty acids (MUFA) increased during autumn. This suggested a synthesis, either of structural fatty acids as MUFA, or a relative increase of C16:1 incorporated into TAGs and DAGs. Our results emphasize the significant role of environmental conditions governing lipid content and composition in microalgae that have to be considered for correct estimation of algal oil yields in biodiesel production. | ||||||||
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