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Paper dry strength improvement by xyloglucan addition: Wet-end application, spray coating and synergism with borate
KTH, School of Biotechnology (BIO). KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova.
VTT Technical Research Centre of Finland.
VTT Technical Research Centre of Finland.
KTH, School of Biotechnology (BIO), Glycoscience. KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova.
2008 (English)In: Holzforschung, ISSN 0018-3830, Vol. 62, no 1, 8-14 p.Article in journal (Refereed) Published
Abstract [en]

The polysaccharide xyloglucan as a wet-end additive improves paper properties. In the present study, paper strength improvement was analysed for dry handsheets made from chemical, mechanical and recycled pulps coated with xyloglucan in a spray application. Results are compared with sheets made from the same pulps treated with xyloglucan in the wet-end. Kraft pulp handsheets of bleached hardwood and softwood showed significant improvements of tensile, tear and Z-strength by xyloglucan spray treatment versus wet-end application, whereas handsheets of de-inked and thermomechanical pulp were improved only slightly. In both wet-end and spray applications, the effect of xyloglucan addition was intimately related to the presence of non-cellulosic components on the fibre surface. Further strength improvements were obtained for chemical pulps by addition of borax to the spray solution, which were likely to be due to the formation of borate-mediated xyloglucan cross-links. Spray coating of xyloglucan, with or without borax, thus represents a potential new application of this polysaccharide to increase paper dry strength.

Place, publisher, year, edition, pages
2008. Vol. 62, no 1, 8-14 p.
Keyword [en]
borax, cellulose, cross-link, de-inked pulp, hardwood pulp, paper dry strength, softwood pulp, spray coating, thermomechanical pulp, xyloglucan
National Category
Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)
Identifiers
URN: urn:nbn:se:kth:diva-7326DOI: 10.1515/HF.2008.002ISI: 000252041400002Scopus ID: 2-s2.0-36849065266OAI: oai:DiVA.org:kth-7326DiVA: diva2:12305
Note
Tidigare titel: Paper dry strength improvement by xyloglucan addition is critically dependent on the purity of cellulose fibre surfaces wet end application, spray coating and synergism with borate. Uppdaterad från submitted till published: 20101102. QC 20101102Available from: 2007-06-15 Created: 2007-06-15 Last updated: 2011-02-22Bibliographically approved
In thesis
1. Surface modification of cellulose materials: from wood pulps to artificial blood vessels
Open this publication in new window or tab >>Surface modification of cellulose materials: from wood pulps to artificial blood vessels
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis describes the improvement of two radically different cellulose materials, paper and artificial blood vessels, constructed from two diverse cellulose sources, wood pulp and Acetobacter xylinum. The improvement of both materials was possible due to the natural affinity of the hemicellulose xyloglucan for cellulose.

Chemical and mechanical pulps were treated with xyloglucan in the wet-end prior to hand sheet formation or by spray application of dry hand sheets, loading a comparable amount of xyloglucan. The tensile strength increases for the wet-end treatment and spray application were 28% and 71% respectively for bleached soft wood, compared to untreated sheets (20.7 Nm/g). The corresponding strength increases for hand sheets made of thermo-mechanical pulp were 6% and 13% respectively compared to untreated sheets (42.4 Nm/g). The tendency for chemical pulp to be superior to mechanical pulp with respect to strength increase was valid even for tear strength and Scott-Bond. These results suggest, in agreement with other studies, that adhesion of xyloglucan to wood fibres is dependent on their degree of surface lignification.

Also, a method was developed to increase the blood compatibility of artificial blood vessels constructed of bacterial cellulose. Xyloglucan was covalently linked to the endothelial cell adhesion motif (Arg-Gly-Asp). To obtain this, new solid-phase coupling chemistry was developed. Xyloglucan oligosaccharides (XGO) were transformed into XGO-succinamic acid via the corresponding XGO--NH2 derivative prior to coupling with the N-terminus of the solid-phase synthesised Gly-Arg-Gly-Asp-Ser peptide. The resin-bound glyco-peptide was then cleaved and enzymatically re-incorporated into high molecular weight xyloglucan. The glyco-peptide was further adsorbed onto bacterial cellulose scaffolds, increasing the adhesion and proliferation of endothelial cells and therefore blood compatibility.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 49 p.
Series
Trita-BIO-Report, ISSN 1654-2312 ; 2007:6
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:kth:diva-4437 (URN)978-91-7178-680-7 (ISBN)
Presentation
2007-06-08, FA 32, KTH, AlbaNova, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101102Available from: 2007-06-15 Created: 2007-06-15 Last updated: 2011-11-23Bibliographically approved

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