Fractionation of Condensed Distillers Solubles and Compositional Characterization of Its Co-Products |
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| Authors: | Keshun Liu |
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| Affiliation: | 1.Grain Chemistry and Utilization Laboratory, National Small Grains and Potato Germplasm Research Unit,US Department of Agriculture, Agricultural Research Service,Aberdeen,USA |
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| Abstract: | Condensed distillers solubles (CDS) was fractionated into a protein-mineral fraction and a glycerol fraction by a chemical method; protein and glycerol-mineral fractions by a physical method; and protein, mineral, and glycerol fractions by a physicochemical method. The co-products from each method, along with CDS, were characterized for concentrations of key constituents (protein, oil, ash, glycerol and other carbohydrates), mineral profile, and amino acid composition. Recovery of mass and main constituents was also investigated. With the chemical method, about two-third of the mass went to the protein-mineral fraction, while by the physical method the equal amounts of mass went to the protein and glycerol-mineral fractions. Protein, minerals, and glycerol were mostly recovered into their respective fractions. CDS and its fractions contained six major minerals (Ca, Mg, P, K, Na, and S) and four trace ones (Cu, Fe, Mn, and Zn). Both chemical and physical treatments caused significant reduction of mineral contents (dry matter basis) in the protein or glycerol fraction. Several amino acids differed significantly in percent relative to total amino acids among fractions but the extent was not substantial for protein-rich fractions. These changes resulting from CDS fractionation are favorable for value added utilization of the new co-products. |
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| Keywords: | Condensed distiller solubles (CDS) Dry grind processing Co‐products Fuel ethanol Amino acids Minerals |
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