Solid-State Fermentation of <Emphasis Type="Italic">Mortierella isabellina</Emphasis> for Lipid Production from Soybean Hull |
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Authors: | Jianguo Zhang Bo Hu |
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Institution: | (1) Department of Bioproducts and Biosystems Engineering, University of Minnesota, 316 BAE, 1390 Eckles Ave, St. Paul, MN 55108-6005, USA; |
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Abstract: | Soybean hull, generated from soybean processing, is a lignocellulosic material with limited industrial applications and little
market value. This research is exploring a new application of soybean hull to be converted to fungal lipids for biodiesel
production through solid-state fermentation. Mortierella isabellina was selected as the oil producer because of its high lipid content at low C/N ratio. Several cultivation factors were investigated,
including moisture content, inoculums size, fungal spore age, and nutrient supplements, in an attempt to enhance the lipid
production of the solid-state fermentation process. The results showed that lipid production with the increase of the moisture
content and the spore age, while decreased as the size of inoculums increased. Nutrients addition (KH2PO4 1.2 mg and MgSO4 0.6 mg/g soybean hull) improved the lipid production. The total final lipid reached 47.9 mg lipid from 1 g soybean hull after
the conversion, 3.3-fold higher than initial lipid reserve in the soybean hull. The fatty acid profile analysis indicated
that fatty acid content consisted of 30.0% of total lipid, and 80.4% of total fatty acid was C16 and C18. Therefore, lipid
production from soybean hull is a possible option to enable soybean hull as a new resource for biodiesel production and to
enhance the overall oil production from soybeans. |
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