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Development of a strategy for the production of docosahexaenoic acid by Schizochytrium sp. from cane molasses and algae-residue

Yin, Feng-Wei, Zhu, Si-Yu, Guo, Dong-Sheng, Ren, Lu-Jing, Ji, Xiao-Jun, Huang, He, Gao, Zhen
Bioresource technology 2019 v.271 pp. 118-124
Schizochytrium, carbon, docosahexaenoic acid, fermentation, glucose, molasses, nitrogen, yeast extract
The aim of this work was to reduce the algae-residue emission and make use of cane molasses as fermentation materials for docosahexaenoic acid (DHA) fermentaion by Schizochytrium sp., which further could cut the cost of DHA production. Algae-residue and cane molasses were respectively used as nitrogen and carbon sources to replace yeast extract and glucose. A significant DHA yield of 18.58 g/L was obtained using algae-residue, while cane molasses could not be used well as sole carbon source due to the presence of undesirable substance. A two-stage culture strategy with glucose followed by pretreated cane molasses as carbon source was developed, resulting in a final DHA yield of 15.22 g/L. This study therefore offers an economical and green strategy for DHA production by Schizochytrium sp.