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The Korean Society of Phycology (한국조류학회(藻類))
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Effects of aeration and centrifugation conditions on omega-3 fatty acid production by the mixotrophic dinoflagellate Gymnodinium smaydae in a semi-continuous cultivation system on a pilot scale

  • Ji Hyun You (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Hae Jin Jeong (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Sang Ah Park (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Se Hee Eom (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Hee Chang Kang (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Jin Hee Ok (Department of Marine Sciences and Convergent Engineering, College of Marine Sciences and Convergence Engineering, Hanyang University ERICA)
  • Received : 2024.05.05
  • Accepted : 2024.06.07
  • Published : 2024.06.19
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Abstract

High production and efficient harvesting of microalgae containing high omega-3 levels are critical concerns for industrial use. Aeration can elevate production of some microalgae by providing CO2 and O2. However, it may lower the production of others by generating shear stress, causing severe cell damage. The mixotrophic dinoflagellate Gymnodinium smaydae is a new, promising microalga for omega-3 fatty acid production owing to its high docosahexaenoic acid content, and determining optimal conditions and methods for high omega-3 fatty acid production and efficient harvest using G. smaydae is crucial for its commercial utilization. Therefore, to determine whether continuous aeration is required, we measured densities of G. smaydae and the dinoflagellate prey Heterocapsa rotundata in a 100-L semi-continuous cultivation system under no aeration and continuous aeration conditions daily for 9 days. Furthermore, to determine the optimal conditions for harvesting through centrifugation, different rotational speeds of the continuous centrifuge and different flow rates of the pump injecting G. smaydae + H. rotundata cells into the centrifuge were tested. Under continuous aeration, G. smaydae production gradually decreased; however, without aeration, the production remained stable. Harvesting efficiency and the dry weights of omega-3 fatty acids of G. smaydae + H. rotundata cells at a rotational speed of 16,000 rpm were significantly higher than those at 2,000-8,000 rpm. However, these parameters did not significantly differ at injection pump flow rates of 1.0-4.0 L min-1. The results of the present study provide a basis for optimized production and harvest conditions for G. smaydae and other microalgae.

Keywords

Acknowledgement

This research was supported by the Useful Dinoflagellate program of Korea Institute of Marine Science and Technology Promotion (KIMST) funded by the Ministry of Oceans and Fisheries (MOF) and the National Research Foundation (NRF) funded by the Ministry of Science and ICT (NRF-2021M3I6A1091272; 2021R1A2C1093379; RS2023-00291696) award to HJJ.

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