Publication Date:
2018-02-28
Description:
ABSTRACT Homogeneous acid-catalyzed hydrolysis of oat β-glucan, which contains β-(1,4) and β-(1,3) glycosidic bonds in a nonrandom order, was studied at 353 K using HCl and H 2 SO 4 . A new structured kinetic model was developed that takes into account the difference in the reactivity of β-(1,4) and β-(1,3) glycosidic bonds as well as their positions in the polysaccharide chain. In order to minimize the correlation of adjustable parameters in the new model, the reactivities of these bonds were studied independently ( T = 313…363 K; c H+ = 0.1…2 mol/L) using cellobiose and laminaribiose. The difference in kinetic parameters (e.g. T = 338 K: k β-(1,4) = 0.693 × 10 −3 L/mol/min, k β-(1,3) = 1.027 × 10 −3 L/mol/min) was found to be statistically significant ( P 〈 0.0001), which emphasizes the need for the structured model for oat β-glucan hydrolysis. The simulation of β-glucan hydrolysis with the new model was in good agreement with the experimental data and shows improvement over existing non-structured models. This article is protected by copyright. All rights reserved.
Print ISSN:
0001-1541
Electronic ISSN:
1547-5905
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
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