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The structure of galactoglucomannan impactsthe degradation under alkaline conditions
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0003-0277-2269
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-8614-6291
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-2900-4713
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2018 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882XArticle in journal (Refereed) Published
Abstract [en]

Galactoglucomannan (GGM) from sprucewas studied with respect to the degradation behavior inalkaline solution. Three reference systems includinggalactomannan from locust bean gum, glucomannanfrom konjac and the linear water-soluble carboxymethylcellulose were studied with focus onmolecular weight, sugar composition, degradationproducts, as well as formed oligomers, to identifyrelative structural changes in GGM. Initially allmannan polysaccharides showed a fast decrease inthe molecular weight, which became stable in the laterstage. The degradation of the mannan polysaccharidescould be described by a function corresponding to thesum of two first order reactions; one slow that wasascribed to peeling, and one fast that was connectedwith hydrolysis. The galactose side group wasstable under conditions used in this study (150 min,90 C, 0.5 M NaOH). This could suggest that, apartfrom the covalent connection to C6 in mannose, thegalactose substitutions also interact non-covalentlywith the backbone to stabilize the structure againstdegradation. Additionally, the combination of differentbackbone sugars seems to affect the stability of thepolysaccharides. For carboxymethyl cellulose thedegradation was linear over time which furthersuggests that the structure and sugar composition playan important role for the alkaline degradation. Moleculardynamics simulations gave details about theconformational behavior of GGM oligomers in watersolution, as well as interaction between the oligomersand hydroxide ions.

Place, publisher, year, edition, pages
Springer, 2018.
Keyword [en]
Hemicellulose, Spruce, Alkaline hydrolysis, Peeling, Structural analysis, Molecular dynamics simulations
National Category
Polymer Technologies Wood Science
Research subject
Fibre and Polymer Science
Identifiers
URN: urn:nbn:se:kth:diva-225161DOI: 10.1007/s10570-018-1737-zScopus ID: 2-s2.0-85043365333OAI: oai:DiVA.org:kth-225161DiVA, id: diva2:1194417
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20180405

Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2018-04-05Bibliographically approved

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Berglund, JennieAzhar, ShoaibLawoko, MartinLindström, MikaelVilaplana, FranciscoWohlert, JakobHenriksson, Gunnar
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Fibre- and Polymer TechnologyWallenberg Wood Science CenterGlycoscience
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Cellulose (London)
Polymer TechnologiesWood Science

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