[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.4490/algae.2020.35.9.2

Semi-continuous cultivation of the mixotrophic dinoflagellate Gymnodinium smaydae, a new promising microalga for omega-3 production

Lim, An Suk (Division of Life Science & Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University)
Jeong, Hae Jin (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
You, Ji Hyun (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)
Park, Sang Ah (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University)

Publication Information

ALGAE / v.35, no.3, 2020 , pp. 277-292 More about this Journal

Abstract

Omega-3 fatty acids, including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), are polyunsaturated fatty acids beneficial to human health. A limited number of microalgae have been used for commercial omega-3 production, which necessitates the identification of new microalgae with high omega-3 contents. We explored the fatty acid composition and EPA and DHA contents of the mixotrophic dinoflagellate Gymnodinium smaydae fed with the optimal algal prey species Heterocapsa rotundata. Cells of G. smaydae were found to be rich in omega-3 fatty acids. In particular, the DHA content of G. smaydae was 21 mg g^-1 dry weight, accounting for 43% of the total fatty acid content. The percentage of DHA in the total fatty acid content of G. smaydae was the highest among the reported microalgae except for Crypthecodinium cohnii. Moreover, to determine if the prey supply interval affected the growth rate of G. smaydae and its fatty acid content, three different prey supply intervals (daily, once every 2 d, and once for 4 d) were tested. Daily prey supply yielded the highest total fatty acid and DHA contents in G. smaydae. Furthermore, we successfully produced high-density G. smaydae cultures semi-continuously for 43 d with daily prey supply. During the semi-continuous cultivation period, the highest density of G. smaydae was 57,000 cells mL^-1, with an average growth rate of 0.7 d^-1. Taken together, the percentage of EPA and DHA in the total fatty acid content was maintained in the range of 54.2-56.9%. The results of this study support G. smaydae as a promising microalgal candidate for commercial DHA production and demonstrate that daily supply of prey can efficiently produce high-density G. smaydae cultures for more than a month.

Keywords

algae; biomass; DHA; EPA; FAME; lipid; polyunsaturated fatty acids;

Citations & Related Records

Times Cited By KSCI : 12 (Citation Analysis)

Reference
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