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Combined Effects of Nitrogen Concentration and Seasonal Changes on the Production of Lipids in Nannochloropsis oculata 
Linnéuniversitetet, Institutionen för biologi och miljö (BOM). (EcoChange)
Necton SA, Olhao, Portugal.
Linnéuniversitetet, Institutionen för biologi och miljö (BOM).
IFREMER, Nantes, France.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Marine Drugs, ISSN 1660-3397, E-ISSN 1660-3397, Vol. 12, nr 4, s. 1891-1910Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Instead of sole nutrient starvation to boost algal lipid production, we addressed nutrient limitation at two different seasons (autumn and spring) during outdoor cultivation in flat panel photobioreactors. Lipid accumulation, biomass and lipid productivity and changes in fatty acid composition of Nannochloropsis oculata were investigated under nitrogen (N) limitation (nitrate:phosphate N:P 5, N:P 2.5 molar ratio). N. oculata was able to maintain a high biomass productivity under N-limitation compared to N-sufficiency (N:P 20) at both seasons, which in spring resulted in nearly double lipid productivity under N-limited conditions (0.21 g L−1 day−1) compared to N-sufficiency (0.11 g L−1 day−1). Saturated and monounsaturated fatty acids increased from 76% to nearly 90% of total fatty acids in N-limited cultures. Higher biomass and lipid productivity in spring could, partly, be explained by higher irradiance, partly by greater harvesting rate (~30%). Our results indicate the potential for the production of algal high value products (i.e., polyunsaturated fatty acids) during both N-sufficiency and N-limitation. To meet the sustainability challenges of algal biomass production, we propose a dual-system process: Closed photobioreactors producing biomass for high value products and inoculum for larger raceway ponds recycling waste/exhaust streams to produce bulk chemicals for fuel, feed and industrial material.

sted, utgiver, år, opplag, sider
Basel, Switzerland: MDPI AG , 2014. Vol. 12, nr 4, s. 1891-1910
Emneord [en]
microalgae; outdoor; Nannochloropsis; large-scale; lipids; fatty acids; nitrogen manipulation; seasonal changes; biofuels; high value products
HSV kategori
Forskningsprogram
Ekologi, Akvatisk ekologi; Kemi, Bioteknik
Identifikatorer
URN: urn:nbn:se:umu:diva-139718DOI: 10.3390/md12041891ISI: 000335759500011OAI: oai:DiVA.org:umu-139718DiVA, id: diva2:1143049
Forskningsfinansiär
Ecosystem dynamics in the Baltic Sea in a changing climate perspective - ECOCHANGETilgjengelig fra: 2014-04-11 Laget: 2017-09-20 Sist oppdatert: 2018-06-09

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Legrand, Catherine
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