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A quantitative study of eicosapentaenoic acid (EPA) production by Nannochloropsis gaditana for aquaculture as a function of dilution rate, temperature and average irradiance

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Abstract

Different pilot-scale outdoor photobioreactors using medium recycling were operated in a greenhouse under different environmental conditions and the growth rates (0.1 to 0.5 day−1) obtained evaluated in order to compare them with traditional systems used in aquaculture. The annualized volumetric growth rate for Nannochloropsis gaditana was 0.26 g l−1 day−1 (peak 0.4 g l−1 day−1) at 0.4 day−1 in a 5-cm wide flat-panel bioreactor (FP-PBR). The biomass productivity achieved in this reactor was 10-fold higher than in traditional reactors, reaching values of 28 % and 45 % dry weight (d.w.) of lipids and proteins, respectively, with a 4.3 % (d.w.) content of eicosapentaenoic acid (EPA). A model for predicting EPA productivity from N. gaditana cultures that takes into account the existence of photolimitation and photoinhibition of growth under outdoor conditions is presented. The effect of temperature and average irradiance on EPA content is also studied. The maximum EPA productivity attained is 30 mg l−1 day−1.

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Acknowledgements

This research was supported by the General Secretariat of Universities, Research and Technology of the Andalusian Government (AGR-5334) and was co-financed by the European Regional Development Fund (ERDF). We would also like to thank CAJAMAR Foundation for its support.

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Authors and Affiliations

  1. Chemical Engineering Area, Department of Engineering, University of Almería, 04120, Almería, Spain

    J. Camacho-Rodríguez, M. C. Cerón-García, J. M. Fernández-Sevilla, F. G. Acién-Fernández & E. Molina-Grima

  2. Department of Greenhouse Technology, Estación Experimental Fundación Cajamar, Almería, 04710, Spain

    A. M. González-Céspedes

Authors
  1. J. Camacho-Rodríguez
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  2. A. M. González-Céspedes
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  3. M. C. Cerón-García
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  4. J. M. Fernández-Sevilla
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  5. F. G. Acién-Fernández
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  6. E. Molina-Grima
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Correspondence to M. C. Cerón-García.

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Camacho-Rodríguez, J., González-Céspedes, A.M., Cerón-García, M.C. et al. A quantitative study of eicosapentaenoic acid (EPA) production by Nannochloropsis gaditana for aquaculture as a function of dilution rate, temperature and average irradiance. Appl Microbiol Biotechnol 98, 2429–2440 (2014). https://doi.org/10.1007/s00253-013-5413-9

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  • DOI: https://doi.org/10.1007/s00253-013-5413-9

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