Enhanced lipid and biomass production by a newly isolated and identified marine microalga

Lipids in Health and Disease

Research

Michel Denis¹  Mohamed Barkallah²  Ramzi Miladi²  Faten Ben Amor²  Slim Abdelkafi²  Mouna Dammak²  David Gosset³  Chantal Pichon³  Bernhard Huchzermeyer⁴  Sandra Mareike Haase⁵  Imen Fendri⁶ 

[1] Aix Marseille Université, Université de Toulon, CNRS/INSU, IRD, Institut Méditerranéen d’Océanologie (MIO), 163 avenue de Luminy, Case 901, 13288, Marseille Cedex 09, France;Biotechnologie des Algues, Biological Engineering Department, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia;Center for Molecular Biophysics (CBM), CNRS UPR4301, Orléans, France;Institute of Botany, Leibniz Universitaet Hannover, Herrenhauser Str. 2, 30419, Hannover, Germany;Institute of Horticultural Production Systems, Section Biosystems Engineering, Leibniz University Hannover, Herrenhauser Str. 2, 30419, Hannover, Germany;Unit Research of Toxicology-Microbiology Environmental and Health UR11ES70, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia;

关键词: Microalgae;    Tetraselmis;    Response surface methodology;    Lipids;    Flow cytometry;    Poly-unsaturated fatty acids;   

DOI  :  10.1186/s12944-016-0375-4

 received in 2016-09-22, accepted in 2016-11-11,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundThe increasing demand for microalgae lipids as an alternative to fish has encouraged researchers to explore oleaginous microalgae for food uses. In this context, optimization of growth and lipid production by the marine oleaginous V2-strain-microalgae is of great interest as it contains large amounts of mono-unsaturated (MUFAs) and poly-unsaturated fatty acids (PUFAs).MethodsIn this study, the isolated V2 strain was identified based on 23S rRNA gene. Growth and lipid production conditions were optimized by using the response surface methodology in order to maximize its cell growth and lipid content that was quantified by both flow cytometry and the gravimetric method. The intracellular lipid bodies were detected after staining with Nile red by epifluorescence microscopy. The fatty acid profile of optimal culture conditions was determined by gas chromatography coupled to a flame ionization detector.ResultsThe phenotypic and phylogenetic analyses showed that the strain V2 was affiliated to Tetraselmis genus. The marine microalga is known as an interesting oleaginous species according to its high lipid production and its fatty acid composition. The optimization process showed that maximum cell abundance was achieved under the following conditions: pH: 7, salinity: 30 and photosynthetic light intensity (PAR): 133 μmol photons.m−2.s−1. In addition, the highest lipid content (49 ± 2.1% dry weight) was obtained at pH: 7, salinity: 37.23 and photosynthetic light intensity (PAR): 188 μmol photons.m−2.s−1. The fatty acid profile revealed the presence of 39.2% and 16.1% of total fatty acids of mono-unsaturated fatty acids (MUFAs) and poly-unsaturated fatty acids (PUFAs), respectively. Omega 3 (ω3), omega 6 (ω6) and omega 9 (ω9) represented 5.28%, 8.12% and 32.8% of total fatty acids, respectively.ConclusionsThis study showed the successful optimization of salinity, light intensity and pH for highest growth, lipid production and a good fatty acid composition, making strain V2 highly suitable for food and nutraceutical applications.

【 授权许可】

CC BY   
© The Author(s). 2016