Abstract
To achieve high time-space efficiency for sophorolipid production with yeast Candida bombicola, a strategy of high cell density fermentation was employed. The approach consisted of two sequential stages: (1) the optimization of the carbon source and the nutrient concentration to achieve the maximal cell density and (2) the computer-aided adjustment of physical parameters and the controlled feeding of substrates for enhanced volumetric productivity. Both stages have been successfully implemented in a 10-L fermenter, where up to 80g dry cell weight/L was obtained and a remarkably high volumetric productivity (> 200g isolated sophorolipids/L/day) was achieved. Both the biomass and volumetric productivity were markedly higher than previously reported. Specifically, the high productivity of sophorolipids could be attained on a very short time scale (24h), highlighting the industrial potential of the platform developed in this work.
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