title: Organic breakdown products resulting from hydrothermal carbonization of brewer's spent grain.
abstract: Hydrothermal carbonization of brewer's spent grain resulted in a solid hydrochar and an aqueous phase rich in macromolecular dissolved organic matter. Both phases were analyzed with regard to low molecular weight organic compounds (MW<500 Da) in lyophilized form by exhaustive solvent extraction followed by pre-chromatographic derivatization and GC/MS-analysis. Low molecular weight acids, O-functionalized phenols, cyclopentenone derivatives, and benzenediols accounted for the majority of organic analytes in both hydrothermal carbonization product streams while being absent in solvent extracts of the pristine biomass. The pattern of short chain functionalized acids in the pristine biomass and in the hydrothermally produced matrices turned out very different. Acylglycerines as the most abundant lipids in pristine brewer's spent grain were quantitatively hydrolyzed under hydrothermal conditions. The recovery of total fatty acids present in the pristine biomass amounted to 19%. The major fraction of hydrophobic breakdown products including fatty acids, fatty alcohols, and sterols was sorbed onto the hydrochar.
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstr. 15, D-04318 Leipzig, Germany. Electronic address: juergen.poerschmann@ufz.de.
authors.forename: J
authors.initials: J
authors.lastname: Poerschmann
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstr. 15, D-04318 Leipzig, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Weiner
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstr. 15, D-04318 Leipzig, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Koehler
authors.affiliation: Helmholtz Centre for Environmental Research - UFZ, Department of Environmental Engineering, Permoserstr. 15, D-04318 Leipzig, Germany.
authors.forename: F-D
authors.initials: FD
authors.lastname: Kopinke
mesh_terms: D000327:Adsorption; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D002244:Carbon / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry; D002523:Edible Grain / Q000737:chemistry*; D005227:Fatty Acids / Q000737:chemistry; D006868:Hydrolysis; D057927:Hydrophobic and Hydrophilic Interactions; D007220:Industrial Waste / Q000032:analysis*; D008055:Lipids; D008970:Molecular Weight; D009930:Organic Chemicals / Q000737:chemistry*; D018514:Plant Structures; D012037:Refuse Disposal / Q000379:methods*
chemical_list: D002264:Carboxylic Acids; D005227:Fatty Acids; D007220:Industrial Waste; D008055:Lipids; D009930:Organic Chemicals; D002244:Carbon
keywords: Brewer’s spent grain; Hydrochar; Hydrothermal carbonization; Organic breakdown products