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

authored by

Julia Steiner, Knut Franke, Martina Kießling, Fischer S., Stefan Töpfl, Volker Heinz, Thomas Becker

Abstract

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.

External Organisation(s)

Technical University of Munich (TUM)
German Institute of Food Technology (DIL e.V.)

Type

Article

Journal

Carbohydrate polymers

Volume

184

Pages

315-322

No. of pages

8

ISSN

0144-8617

Publication date

15.03.2018

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Organic Chemistry, Polymers and Plastics, Materials Chemistry

Sustainable Development Goals

SDG 3 - Good Health and Well-being

Electronic version(s)

https://doi.org/10.1016/j.carbpol.2017.12.038 (Access: Closed)