Journal
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
Volume 25, Issue 12, Pages 2121-2128Publisher
SPRINGER
DOI: 10.1007/s11274-009-0115-2
Keywords
Thraustochytrids; Polyunsaturated fatty acid; DHA; Wastewater
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Liquid residues from beer (RB) and potato (RP) processing were evaluated as carbon sources for the production of docosahexaenoic acid (C22:6n-3, DHA) by two native Thraustochytriidae sp., M12-X1 and C41, in shaking flask experiments. Results were compared with those obtained in the fermentations of glucose, maltose, soluble starch and ethanol. Both strains produced the highest biomass concentration (2.3 g/L) in the fermentation of RB supplemented with nitrogen sources [yeast extract (YE) and monosodium glutamate (MSG)]. DHA content in the fatty acids produced by the native thraustochytrids was dependent on the fermented carbon source; the fatty acids from biomass grown on carbon sources that permitted a lower growth rate contained more DHA. The highest DHA productivity [55.1 mg/(day L)] was obtained in the fermentation of RB-YE-MSG by M12-X1 strain. In this medium, M12-X1 strain grew at a specific growth rate of 0.014 h(-1) and total fatty acid content in the biomass was 41.3%. Production of DHA by M12-X1 strain followed a non-growth rate associated pattern and DHA content in the biomass decreased significantly after growth ceased.
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