Abstract
The efficiency of Cryptococcusalbidus was evaluated for its abilities to assimilate onion and apple hydrolysates as a medium for lipid production. Onion waste (OW) and apple waste (AW) were hydrolysed at an organic load of 2% total solids by indigenous microbes under mesophilic conditions. The indigenous microbes effectively hydrolysed both wastes giving the highest reducing sugar content of 4.8 g/L and 10.8 g/L with OW and AW hydrolysates, respectively. The microbiome analysis revealed that most of the indigenous microbes belonged to genus Bacillus and a significant population of α-proteobacteria and γ-proteobacteria were also present. Cell retention culture of C. albidus at a dilution rate of 0.01 h−1 resulted in a total dry cell weight (DCW) of 13.5 g/L with an intracellular lipid content of 20.0% at 168 h, corresponding to an enhancement of 3.48-folds and 2.37-folds in DCW and lipid concentration, respectively, as compared to batch fermentation.
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Acknowledgements
This research was supported by the National Research Foundation of Korea (NRF-2017R1A2B4002371). ES and PK are thankful for the financial support provided by a Brain Korea 21 plus project.
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Sathiyamoorthi, E., Kumar, P. & Kim, B.S. Lipid production by Cryptococcus albidus using biowastes hydrolysed by indigenous microbes. Bioprocess Biosyst Eng 42, 687–696 (2019). https://doi.org/10.1007/s00449-019-02073-1
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DOI: https://doi.org/10.1007/s00449-019-02073-1