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Impact of bubble size on docosahexaenoic acid production by Crypthecodinium cohnii in bubble column bioreactor

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Abstract

Cultivation conditions especially agitation and aeration have critical roles on Crypthecodinium cohnii growth and docosahexaenoic acid (DHA) formation. In this study, for the first time, different air bubble sizes were considered, in a 5-L bubble column bioreactor; and the effect of bubble size on growth and on DHA production by dinoflagellate microalgae C. cohnii was investigated. The cultivation was carried out under 0.5 vvm aeration flow rate, 28 °C, and pH ± 7. The highest yield of DHA (1.4 g DHA L−1) was achieved for 0.36-cm air bubble diameter; the corresponding biomass amount was 17.6 g. The suitable conditions during the logarithmic stage of growth were provided for 0.36-cm air bubble diameter, while oxygen limitation was observed in the culture medium afterwards. The concentration of the microalgal DHA was increased in oxygen limitation conditions. Our results indicate that the air bubble diameter is the most influencing factor on DHA production in a bubble column bioreactor. Current research indicates that optimum bubble size in bubble column bioreactor can lead to optimal conditions for growth and DHA production like two-stage oxygen supply feeding strategy.

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Acknowledgments

The authors would like to thank the staff of life science engineering and Micro-Electro-Mechanical Systems Laboratory for their assistance.

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Authors and Affiliations

  1. Department of Life Science Engineering, Faculty of New Sciences and Technologies, University of Tehran, P.O. Box: 14395-1561, North Kargar St., Tehran, Islamic Republic of Iran

    Niloofar Hoseinkhani, Hasan Jalili & Shahin Ansari

  2. Ecole Nationale Supérieure de Chimie de Rennes, Univ Rennes, CNRS, ISCR – UMR 6226, 35000, Rennes, France

    Abdeltif Amrane

Authors
  1. Niloofar Hoseinkhani
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  2. Hasan Jalili
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  3. Shahin Ansari
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  4. Abdeltif Amrane
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Contributions

The work was conceived and designed by Dr. H. J. The performance of experiments was done by N.H. The preparation of the manuscript was done by S.A. and N.H. Final revision of the manuscript was done by Dr. H. J. and Prof. A.A.

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Correspondence to Hasan Jalili.

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Hoseinkhani, N., Jalili, H., Ansari, S. et al. Impact of bubble size on docosahexaenoic acid production by Crypthecodinium cohnii in bubble column bioreactor. Biomass Conv. Bioref. 11, 1137–1144 (2021). https://doi.org/10.1007/s13399-019-00510-5

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