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Lytic polysaccharide monooxygenase (LPMO) mediated production of ultra-fine cellulose nanofibres from delignified softwood fibres
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Glycoscience. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-7438-4030
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Glycoscience.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Glycoscience.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
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2019 (English)In: Green Chemistry, ISSN 1463-9262, E-ISSN 1463-9270Article in journal (Refereed) Published
Abstract [en]

The production of cellulose nanofibres (CNFs) typically requires harsh chemistry and strong mechanical fibrillation, both of which have negative environmental impacts. A possible solution is offered by lytic polysaccharide monooxygenases (LPMOs), oxidative enzymes that boost cellulose fibrillation. Although the role of LPMOs in oxidative modification of cellulosic substrates is rather well established, their use in the production of cellulose nanomaterials is not fully explored, and the effect of the carbohydrate-binding module (CBM) on nanofibrillation has not yet been reported. Herein, we studied the activity of two LPMOs, one of which was appended to a CBM, on delignified softwood fibres for green and energy-efficient production of CNFs. The CNFs were used to prepare cellulose nanopapers, and the structure and properties of both nanofibres and nanopapers were determined. Both enzymes were able to facilitate nanocellulose fibrillation and increase colloidal stability of the produced CNFs. However, the CBM-lacking LPMO was more efficient in introducing carboxyl groups (0.53 mmol/g) on the cellulose fibre surfaces and releasing CNFs with thinner width (4.3 ± 1.5 nm) from delignified spruce fibres than the modular LPMO (carboxylate content of 0.38 mmol/g and nanofibre width of 6.7± 2.5 nm through LPMO pretreatment followed by mild homogenisation. The prepared nanopapers showed improved mechanical properties (tensile strength of 262 MPa, and modulus of 16.2 GPa) compared to conventional CNFs preparation methods, demonstrating the potential of LPMOs as green alternatives for cellulose nanomaterials preparation.

Place, publisher, year, edition, pages
2019.
Keywords [en]
nanocellulose LPMO CNF cellulose
National Category
Polymer Chemistry
Research subject
Biotechnology; Fibre and Polymer Science; Chemical Engineering; Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-260333DOI: 10.1039/C9GC02808KOAI: oai:DiVA.org:kth-260333DiVA, id: diva2:1355278
Note

QC 20191009

Available from: 2019-09-27 Created: 2019-09-27 Last updated: 2019-10-15Bibliographically approved

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Koskela, SallaWang, ShennanXu, DingfengYang, XuanBerglund, LarsMcKee, Lauren S.Bulone, VincentZhou, Qi

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Koskela, SallaWang, ShennanXu, DingfengYang, XuanLi, KaiBerglund, LarsMcKee, Lauren S.Bulone, VincentZhou, Qi
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GlycoscienceWallenberg Wood Science Center
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