Value-added oil and animal feed production from corn-ethanol stillage using the oleaginous fungus Mucor circinelloides
2012
Mitra, Debjani | Rasmussen, Mary L. | Chand, Priyanka | Chintareddy, Venkat Reddy | Yao, Linxing | Grewell, David | Verkade, John G. | Wang, Tong | (Hans) van Leeuwen, J.
This study highlights the potential of oleaginous fungus, Mucor circinelloides in adsorbing/assimilating oil and nutrients in thin stillage (TS), and producing lipid and protein-rich fungal biomass. Fungal cultivation on TS for 2days in a 6-L airlift bioreactor, resulted in a 92% increase in oil yield from TS, and 20g/L of fungal biomass (dry) with a lipid content of 46% (g of oil per 100g dry biomass). Reduction in suspended solids and soluble chemical oxygen demand (SCOD) in TS were 95% and 89%, respectively. The polyunsaturated fatty acids in fungal oil were 52% of total lipids. Fungal cells grown on Yeast Malt (YM) broth had a higher concentration of γ-linolenic acid (17wt.%) than those grown on TS (1.4wt.%). Supplementing TS with crude glycerol (10%, v/v) during the stationary growth phase led to a further 32% increase (from 46% to 61%) in cellular oil content.
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