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Seasonal variation of lipids and fatty acids of the microalgae Nannochloropsis oculata grown in outdoor large-scale photobioreactors
Linnéuniversitetet, Institutionen för naturvetenskap, NV.
Linnéuniversitetet, Institutionen för naturvetenskap, NV.
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2012 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 5, no 5, p. 1577-1592Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2012. Vol. 5, no 5, p. 1577-1592
Keyword [en]
microalgae, Nannochloropsis oculata, large-scale, seasonal variation, light, temperature, biofuels, biodiesel, lipids, fatty acids
National Category
Biological Sciences
Research subject
Environmental Science, Environmental technology; Chemistry, Biotechnology; Ecology, Aquatic Ecology; Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
URN: urn:nbn:se:umu:diva-139411DOI: 10.3390/en5051577ISI: 000304450700017OAI: oai:DiVA.org:umu-139411DiVA, id: diva2:1140376
Available from: 2013-05-29 Created: 2017-09-12 Last updated: 2018-06-09

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