title: An attempt towards simultaneous biobased solvent based extraction of proteins and enzymatic saccharification of cellulosic materials from distiller's grains and solubles.
abstract: Distiller's grains and solubles (DGS) is the major co-product of corn dry mill ethanol production, and is composed of 30% protein and 30-40% polysaccharides. We report a strategy for simultaneous extraction of protein with food-grade biobased solvents (ethyl lactate, d-limonene, and distilled methyl esters) and enzymatic saccharification of glucan in DGS. This approach would produce a high-value animal feed while simultaneously producing additional sugars for ethanol production. Preliminary experiments on protein extraction resulted in recovery of 15-45% of the protein, with hydrophobic biobased solvents obtaining the best results. The integrated hydrolysis and extraction experiments showed that biobased solvent addition did not inhibit hydrolysis of the cellulose. However, only 25-33% of the total protein was extracted from DGS, and the extracted protein largely resided in the aqueous phase, not the solvent phase. We hypothesize that the hydrophobic solvent could not access the proteins surrounded by the aqueous phase inside the fibrous structure of DGS due to poor mass transfer. Further process improvements are needed to overcome this obstacle.
authors.affiliation: Process Technology Research, Energy Systems Division, Argonne National Laboratory, Argonne, IL 60439, USA.
authors.forename: Saurav
authors.initials: S
authors.lastname: Datta
authors.forename: B D
authors.initials: BD
authors.lastname: Bals
authors.forename: Yupo J
authors.initials: YJ
authors.lastname: Lin
authors.forename: M C
authors.initials: MC
authors.lastname: Negri
authors.forename: R
authors.initials: R
authors.lastname: Datta
authors.forename: L
authors.initials: L
authors.lastname: Pasieta
authors.forename: Sabeen F
authors.initials: SF
authors.lastname: Ahmad
authors.forename: Akash A
authors.initials: AA
authors.lastname: Moradia
authors.forename: B E
authors.initials: BE
authors.lastname: Dale
authors.forename: Seth W
authors.initials: SW
authors.lastname: Snyder
mesh_terms: D000821:Animal Feed; D001709:Biotechnology / Q000379:methods*; D002482:Cellulose / Q000737:chemistry; D053138:Cyclohexenes / Q000737:chemistry; D002523:Edible Grain / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry*; D005947:Glucose / Q000737:chemistry*; D006868:Hydrolysis; D007220:Industrial Waste; D000077222:Limonene; D011134:Polysaccharides / Q000737:chemistry; D011506:Proteins / Q000737:chemistry; D015203:Reproducibility of Results; D012997:Solvents / Q000737:chemistry*; D013729:Terpenes / Q000737:chemistry; D013997:Time Factors
chemical_list: D053138:Cyclohexenes; D007220:Industrial Waste; D011134:Polysaccharides; D011506:Proteins; D012997:Solvents; D013729:Terpenes; D000431:Ethanol; D002482:Cellulose; D000077222:Limonene; D005947:Glucose