Abstract
Different fermentation processes, including batch, fed-batch and repeated fed-batch processes by Schizochytrium sp., were studied and compared for the effective DHA-rich microbial lipids production. The comparison between different fermentation processes showed that fed-batch process was a more efficient cultivation strategy than the batch process. Among the four different feeding strategies, the glucose concentration feed-back feeding strategy had achieved the highest fermentation results of final cell dry weight, total lipids content, DHA content and DHA productivity of 72.37, 48.86, 18.38 g l−1 and 138.8 mg l−1 h−1, respectively. The repeated fed-batch process had the advantages of reducing the time and cost for seed culture and inoculation between each fermentation cycles. The results of fermentation characteristics and lipid characterization of the repeated fed-batch process indicated that this repeated fed-batch process had promising industrialization prospect for the production of DHA-rich microbial lipids.
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Acknowledgments
This work was financially supported by the National Basic Research Program of China (no. 2011CBA00802), the Scientific Research Project for Post-graduate in Jiangsu Province (no. CXLX11_0366), the Natural Science Foundation of Jiangsu Province (no. BK2012424), National Science Foundation for Distinguished Young Scholars of China (no. 21225626), the National Science and Technology Pillar Program (no. 2011BAD23B03), and the National High Technology Research and Development Program of China (no. 2012AA021704).
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Qu, L., Ren, LJ., Sun, GN. et al. Batch, fed-batch and repeated fed-batch fermentation processes of the marine thraustochytrid Schizochytrium sp. for producing docosahexaenoic acid. Bioprocess Biosyst Eng 36, 1905–1912 (2013). https://doi.org/10.1007/s00449-013-0966-7
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DOI: https://doi.org/10.1007/s00449-013-0966-7