Article

Semi-solid state fermentation of sweet sorghum for the biotechnological production of single cell oil

Department of Environmental and Natural Resources Management, University of Ioannina, G. Seferi 2, 30100 Agrinio, Greece; Unit of Microbiology, Division of Genetics, Cell and Development Biology, Department of Biology, University of Patras, 26504 Patras, Greece; Department of Chemical Engineering, University of Patras, 26504 Patras, Greece; Institute of Chemical Engineering and High Temperature Chemical Processes, 26504 Patras, Greece
Bioresource Technology DOI:10.1016/j.biortech.2009.09.028 pp.1385-1388

ABSTRACT A semi-solid fermentation process for the production of biodiesel from sweet sorghum is introduced. The microorganism used is the oleaginous fungus Mortierella isabellina, which is able to transform efficiently sugar to storage lipid. Kinetic experiments were performed at various water content percentages. The fungus consumed simultaneously sugars and nitrogen contained in sorghum and after nitrogen depletion the biomass growth was completed and oil accumulation began. Water content of 92% presented the highest oil efficiency of 11 g/100 g dry weight of substrate. The semi-solid process is shown to have certain advantages compared to liquid cultures or solid-state fermentation and gives oil of high quality.

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Keywords

biomass growth
 
fungus
 
highest oil efficiency
 
Kinetic experiments
 
oil accumulation
 
oleaginous fungus Mortierella isabellina
 
semi-solid fermentation process
 
semi-solid process
 
storage lipid
 
various water content percentages
 
Water content