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- W1982221291 abstract "Sequential fermentation for the production of two invaluable biopolymers, levan and poly-ε-lysine (ε-PL), has been successfully developed. It involves fermentation of Bacillus subtilis (natto) Takahashi in sucrose medium to produce levan, separation of levan product from small remaining sugar molecules by ultrafiltration and fermentation of the remnant from levan production by Streptomyces albulus to produce ε-PL. In the process, 50–60 g/L of levan was produced (100% recovery after precipitation by ethanol). The remnant from levan production with glucose adjusted to 30 g/L and with combined use of yeast extract (10 g/L), (NH4)2SO4 (2 g/L) and basal salts was proven to be suitable for ε-PL production. 4.37 g/L of ε-PL accumulation (85% recovery after purification) was reached in 72 h using two-stage fermentation with control of pH. The process of using remnant (waste) from levan fermentation for the second biopolymer (ε-PL) production is unprecedented and the products obtained are environmental-friendly." @default.
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- W1982221291 date "2011-02-01" @default.
- W1982221291 modified "2023-09-24" @default.
- W1982221291 title "Sequential production of two biopolymers-levan and poly-ε-lysine by microbial fermentation" @default.
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- W1982221291 doi "https://doi.org/10.1016/j.biortech.2010.11.066" @default.
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