Location: Sustainable Biofuels and Co-Products
2010 Annual Report
2: Develop technologies that enable new, commercially-viable* processes to produce food-grade corn oil, proteins, phytochemicals or other high-value coproducts from ethanol biorefineries.
3: Develop fractionation, enzymatic and/or chemical technologies that enable commercially-viable, high-value, non-fermentation hemicellulose- and cellulose-based coproducts from lignocellulosics.
* Potential commercial-viability will be regularly assessed with assistance from ONP, OTT and/or industrial partners.
Experiments on the effects of carbon dioxide sparging at various flow rates on succinic acid production by strain E coli AFP184 have been initiated and are still in progress. It is expected that the experiments will be completed early in FY 2011.
Coccolithophore cultures have been obtained from culture collections and stock cultures have been prepared. The identification of Coccolithophores and the appropriate growth conditions for subsequent studies has been initiated. Preliminary experiments have identified 3 promising candidates for further studies and others are continuing to be evaluated. Twenty liter cultivations will be done to prepare sufficient material for compositional analysis and will be complete by the end of FY 2010 or early in FY 2011.
Pilot scale experiments for corn germ oil recovery using a bubble column and aqueous enzymatic extraction pretreatment are being conducted. The recovered foam from the bubble column can be used to concentrate the free oil released; however, the pretreatment conditions used must not seriously degrade the foam stabilizing components. Experiments to improve the yield of free oil and the total oil in the foam are being investigated using germ cooking in combination with enzyme mixtures. Currently about 70% of the total oil is free oil and can be recovered in the foam. An additional 10% of the total oil is recovered in the foam; however, this is not free and requires further processing for recovery.
The extraction of constituents of agricultural residues, agricultural processing by-products and energy crops has been completed. Organic solvents (hexane, methylene chloride and ethanol) soluble components of corn Stover, rice straw, rice hull, sugar cane bagasse, switch grass and Miscanthus were extracted, dried and their percentage yields calculated. The water soluble components, starch, Hemicellulose A, Hemicellulose B, oligosaccharides, acid insoluble lignin, acid soluble lignin and cellulosic residue from corn Stover, rice hull, rice straw and Miscanthus were extracted, dried and their percent yields were calculated. The data collected from the fractionation studies will be used to help determine their value and commercial viabilities for coproduct production from biofuel facilities.
Yadav, M.P., Parris, N., Johnston, D., Onwulata, C.I., Hicks, K.B. 2010. Corn fiber gum and milk protein conjugates with improved emulsion stability. Carbohydrate Polymers. 81:476-483.