TY - JOUR

T1 - Influence of hydrothermal treatment on the structural modification of spent grain specific carbohydrates and the formation of degradation products using model compounds

AU - Steiner, Julia

AU - Franke, Knut

AU - Kießling, Martina

AU - S., Fischer

AU - Töpfl, Stefan

AU - Heinz, Volker

AU - Becker, Thomas

N1 - Funding information: This research project was supported by the German Federal Ministry of Economic Affairs and Energy (via AiF) and the FEI (Forschungskreis der Ernährungsindustrie e.V., Bonn), Project AiF 17170?N. The authors would like to thank Michael Kupetz, Technical University of Munich, Institute of Brewing and Beverage Technology, Research Group Beverage and Cereal Biotechnology, 85354 Freising, Germany for his assistance.

PY - 2018/3/15

Y1 - 2018/3/15

N2 - Brewer's spent grain (BSG) constitutes various valuable carbohydrates that may contribute to a healthy diet. These components may be obtained from BSG via hydrothermal treatment (HT), a procedure for dissolving water-inextricable carbohydrates. The objective of this study was to investigate HT as an environmentally friendly technology for extracting high-molecular-weight fiber with proven beneficial effects on human health. Cellulose, β-glucan, and arabinoxylan (AX) served as model substances and were subjected to auto-hydrolysis at different temperatures and reaction times. The results were evaluated in terms of structural and chemical characteristics. When the treatment temperature was increased, the original weight-average molar mass of AX (370 kDa) and β-glucan (248 kDa) decreased gradually (<10 kDa), and the molar mass distribution narrowed. Further investigations focused on the heat-induced formation and elimination of monosaccharides and undesirable by-products. The concentrations of by-products were successfully described by kinetic models that can be used to optimize the hydrolysis process.

AB - Brewer's spent grain (BSG) constitutes various valuable carbohydrates that may contribute to a healthy diet. These components may be obtained from BSG via hydrothermal treatment (HT), a procedure for dissolving water-inextricable carbohydrates. The objective of this study was to investigate HT as an environmentally friendly technology for extracting high-molecular-weight fiber with proven beneficial effects on human health. Cellulose, β-glucan, and arabinoxylan (AX) served as model substances and were subjected to auto-hydrolysis at different temperatures and reaction times. The results were evaluated in terms of structural and chemical characteristics. When the treatment temperature was increased, the original weight-average molar mass of AX (370 kDa) and β-glucan (248 kDa) decreased gradually (<10 kDa), and the molar mass distribution narrowed. Further investigations focused on the heat-induced formation and elimination of monosaccharides and undesirable by-products. The concentrations of by-products were successfully described by kinetic models that can be used to optimize the hydrolysis process.

KW - Asymmetric flow-field-flow-fractionation

KW - Brewer's spent grain

KW - Hydrothermal treatment

KW - Molar mass

KW - Polysaccharides

KW - Thermal degradation products

UR - http://www.scopus.com/inward/record.url?scp=85039980916&partnerID=8YFLogxK

U2 - 10.1016/j.carbpol.2017.12.038

DO - 10.1016/j.carbpol.2017.12.038

M3 - Article

VL - 184

SP - 315

EP - 322

JO - Carbohydrate polymers

JF - Carbohydrate polymers

SN - 0144-8617

ER -