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  • Title: Converting crude glycerol derived from yellow grease to lipids through yeast fermentation.
    Author: Liang Y, Cui Y, Trushenski J, Blackburn JW.
    Journal: Bioresour Technol; 2010 Oct; 101(19):7581-6. PubMed ID: 20478702.
    Abstract:
    Cryptococcus curvatus, an oleaginous yeast was observed to grow on crude glycerol derived from yellow grease. When cultured in a one-stage fed-batch process wherein crude glycerol and nitrogen source were fed intermittently for 12 days, the final biomass density and lipid content were 31.2 g/l and 44.2%, respectively. When cultured in a two-stage fed-batch operation wherein crude glycerol was supplemented at different time points while nitrogen source addition was discontinued at the middle of the experiment, the biomass density was 32.9 g/l and the lipid content was 52% at the end of 12 days. Compared with other oil feedstocks for biodiesel production, lipid accumulated by C. curvatus grown on glycerol has high concentration of monounsaturated fatty acid, which makes it an excellent source for biodiesel use.
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