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Gewählte Publikation:

Makela, N; Sontag-Strohm, T; Schiehser, S; Potthast, A; Maaheimo, H; Maina, NH.
(2017): Reaction pathways during oxidation of cereal beta-glucans
CARBOHYD POLYM. 2017; 157: 1769-1776. FullText FullText_BOKU

Abstract:
Oxidation of cereal beta-glucans may affect their stability in food products. Generally, polysaccharides oxidise via different pathways leading to chain cleavage or formation of oxidised groups within the polymer chain. In this study, oxidation pathways of oat and barley beta-glucans were assessed with different concentrations of hydrogen peroxide (H2O2) or ascorbic acid (Asc) with ferrous iron (Fe2+) as a catalyst. Degradation of beta-glucans was evaluated using high performance size exclusion chromatography and formation of carbonyl groups using carbazole-9-carbonyloxyamine labelling. Furthermore, oxidative degradation of glucosyl residues was studied. Based on the results, the oxidation with Asc mainly resulted in glycosidic bond cleavage. With H2O2, both glycosidic bond cleavage and formation of carbonyl groups within the beta-glucan chain was found. Moreover, H2O2 oxidation led to production of formic acid, which was proposed to result from Ruff degradation where oxidised glucose (gluconic acid) is decarboxylated to form arabinose. (C) 2016 Elsevier Ltd. All rights reserved.
Autor/innen der BOKU Wien:
Potthast Antje
Schiehser Sonja
BOKU Gendermonitor:


Find related publications in this database (Keywords)
beta-Glucan
Oxidation
Hydrogen peroxide
Ascorbic acid
Formic acid


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