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Enzyme catalyzed cross-linking of spruce galactoglucomannan improves its applicability in barrier films
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
2013 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 95, no 2, 690-696 p.Article in journal (Refereed) Published
Abstract [en]

Hemicelluloses are one of the main constituents of plant cell walls and thereby one of the most abundant biopolymers on earth. They can be obtained as by-products from different wood based processes, most importantly from the mechanical pulping. Hemicelluloses have interesting properties in e.g. barrier film applications. However, their relatively low molecular weight after isolation and co-extraction with lignin has limited their use. In this work, we present a novel technique for increasing the molecular weight of different wood hemicelluloses from mechanical pulping process waters as well as from pre-hydrolysis extracts. This is achieved by enzyme-catalyzed cross-linking of aromatic moieties bound to the hemicelluloses. The cross-linking treatment resulted in significantly improved mechanical properties in barrier films made with spruce galactoglucomannan. To our knowledge, this is the first time that wood hemicelluloses have been cross-linked by utilizing the bound aromatic moieties and creates new possibilities for utilizing this raw material source.

Place, publisher, year, edition, pages
2013. Vol. 95, no 2, 690-696 p.
Keyword [en]
Hemicellulose, Laccase, Cross-linking, Barrier film, Mechanical pulping
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-124444DOI: 10.1016/j.carbpol.2013.03.016ISI: 000319644900012Scopus ID: 2-s2.0-84877578791OAI: oai:DiVA.org:kth-124444DiVA: diva2:636458
Funder
Swedish Research Council, 621-2008-4177
Note

QC 20130710

Available from: 2013-07-10 Created: 2013-07-05 Last updated: 2017-12-06Bibliographically approved
In thesis
1. A biomimicking approach for hemicellulose processing
Open this publication in new window or tab >>A biomimicking approach for hemicellulose processing
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lignocellulose can become the best opportunity for the society to reduce its dependency on the harmful petroleum based products as well as to produce clean energy. In each part of the production cycle, biomass based products have a better environmental profiles than their petroleum based counterparts. Woody biomass has a vast availability, but it suffers from recalcitrance that is mostly caused by lignin that is functioning as a matrix, surrounding and binding the carbohydrates that are currently the most valuable of the wood components.

Lignin-carbohydrate (LC) bonds are believed to be a key element in this recalcitrance and research has shown that these types of bonds are common in wood. These bonds are important in an economical point of view as well, as e.g. residual lignin structures in pulp (lignins bonded to the cellulose and hemicelluloses) require expensive bleaching sequences for their removal.

The LC-structures can also be exploited technically as we now have demonstrated. We developed a method that utilizes phenolic end groups that are bonded to different hemicelluloses for cross-linking. The enzyme laccase was used for the cross-linking to create a cost-efficient processing scheme to both isolate and increase the molecular weight of the hemicelluloses. Membrane filtration was used as the key separation technique, which enables the establishment of industrial scale production. The final product had improved mechanical and thermal properties and could be used e.g. as barrier film component in renewable packaging. Nanocomposite formation with nanofibrillated cellulose was also studied. This improved the film properties further. The complexes are also possible to use as model compounds for lignin-carbohydrate complexes in wood.

This technique can also be seen to mimick the lignification and lignin-carbohydrate network formation phenomena in plants enabling the formation of entire networks of wood components. Our results suggests that the side chains of hemicellulose might play an important role in network formation and that hemicellulose molecules can carry more than one lignin phenolic end group to fulfill this capability.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. 50 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:30
Keyword
Mechanical pulping, Hemicellulose, Cross-linking, Lignin-carbohydrate-complex
National Category
Polymer Technologies
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-148586 (URN)978-91-7595-221-5 (ISBN)
Public defence
2014-09-05, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 621-2008-4177Knut and Alice Wallenberg FoundationVinnova, 2011-03387
Note

QC 20140825

Available from: 2014-08-25 Created: 2014-08-08 Last updated: 2014-08-25Bibliographically approved

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