title: A Kinetic Study of DDGS Hemicellulose Acid Hydrolysis and NMR Characterization of DDGS Hydrolysate.
abstract: Liquid hot water (LHW) extraction was used as a pretreatment method to separate the hemicellulose fraction from dried distiller's grain with solubles (DDGS) into liquid phase. Acid hydrolysis using 3.264 % w/w sulfuric acid at 130 °C was performed to convert polysaccharides in LHW extract to monosaccharides. The structure characterization of DDGS in anomeric carbon region based on proton NMR and heteronuclear single quantum coherence (HSQC) during acid hydrolysis was studied in this work. It reveals that the sugar units in DDGS hemicelluloses are constructed with (1-4)-β-D-xylopyranose and α-L-arabinofuranosyl residues. A kinetic model is included to explain the changing concentration of monomer, oligomer, and sugar units. The model was further tested based on the changing concentration of five carbon sugar units during hydrolysis.
authors.affiliation: Department of Paper and Bioprocess Engineering, State University of New York-College of Environmental Science and Forestry, Syracuse, NY, 13210, USA, hchen23@syr.edu.
authors.forename: Hanchi
authors.initials: H
authors.lastname: Chen
authors.forename: Shijie
authors.initials: S
authors.lastname: Liu
mesh_terms: D002138:Calibration; D057168:Distillation; D006358:Hot Temperature; D006868:Hydrolysis; D007220:Industrial Waste / Q000032:analysis*; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D008962:Models, Theoretical; D011134:Polysaccharides / Q000737:chemistry*; D012995:Solubility; D013464:Sulfuric Acids / Q000737:chemistry*; D014867:Water; D014990:Xylans / Q000737:chemistry
chemical_list: D007220:Industrial Waste; D011134:Polysaccharides; D013464:Sulfuric Acids; D014990:Xylans; D014867:Water; C007916:hemicellulose; C085118:arabinoxylan; C033158:sulfuric acid