Influence of nitrogen sources on growth of thraustochytrids in waste water from the demineralization of cheese whey

Tomáš Humhal, Olga Kronusová, Petr Kaštánek, Tomáš Potočár, Jana Kohoutková and Tomáš Brányik
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Tomáš Humhal: Department of Biotechnology, University of Chemistry and Technology Prague, Prague, Czech Republic
Olga Kronusová: Department of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Prague, Czech Republic
Petr Kaštánek: Department of Biotechnology, University of Chemistry and Technology Prague, Prague, Czech Republic
Tomáš Potočár: Department of Biotechnology, University of Chemistry and Technology Prague, Prague, Czech Republic
Jana Kohoutková: Department of Food Analysis and Nutrition, University of Chemistry and Technology Prague, Prague, Czech Republic
Tomáš Brányik: Department of Biotechnology, University of Chemistry and Technology Prague, Prague, Czech Republic

Czech Journal of Food Sciences, 2019, vol. 37, issue 5, 383-390

Abstract: An experimental design was ued to optimize the growth of two thraustochytrids, (Schizochytrium limacinum PA-968 and Japonochytrium marinum AN-4), on different nitrogen sources (yeast extract, corn steep liquor, ammonium sulphate) supplemented into saline waste water from the demineralization of cheese whey. Yeast extract was found to be the most suitable complex nutrient source. Nitrogen limitation was found to increase the lipid content in shake flask cultures of thraustochytrids by 12.7-22.4% w/w. The maximum total lipid content (79.1% w/w) and docosahexaenoic acid productivity (0.465 g/l per day) were achieved by J. marinum AN-4 in shake flask cultures. Fed-batch cultures of J. marinum AN-4, under conditions of nitrogen limitation, yielded biomass with a lower lipid content (72.1% wt.) but higher docosahexaenoic acid productivity (1.43 g/l per day). These results provide proof of concept that fed-batch cultivation of thraustochytrids, combined with nitrogen limitation, can be an appropriate strategy for the productive use of saline waste water from the dairy industry.

Keywords: docosahexaenoic acid; Japonochytrium marinum; nitrogen limitation; saline waste water; Schizochytrium limacinum (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:37:y:2019:i:5:id:172-2018-cjfs

DOI: 10.17221/172/2018-CJFS

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