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The biology and properties of wood for nanocellulose production

Bünder, Anne (2021). The biology and properties of wood for nanocellulose production. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-823-3
eISBN 978-91-7760-824-0
[Doctoral thesis]

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Wood is a renewable and environmentally friendly raw material envisioned for the production of novel materials. In this interdisciplinary thesis project, I investigated genetic factors controlling cellulose biosynthesis, cellulose microfibril dimensions, wood mechanical properties and factors that influence nanocellulose extraction from wood.
I show that RNA-interference-mediated reduction of the CELLULOSE SYNTHASE-INTERACTIVE 1 (CSI1), which is known to link the cellulose synthase complex (CSC) to cortical microtubules (cMTs), affects wood mechanical properties as well as fibre dimensions and cellulose degree of polymerization (DP) in hybrid aspen (Populus tremula x tremuloides).
Furthermore, the reduced level of CSI1 was shown to negatively affect cellulose nanofibril (CNF) separation, possibly due to structural differences in cellulose microfibrils (CMFs) and/or cell wall matrix interactions. Additionally, alteration in cellulose DP and wood mechanical properties were found to be preserved in the manufactured CNF networks.
In collaboration with material scientists, I also investigated the effect of tension wood and variations in wood lignin content on nanocellulose isolation and properties. We found that the cell wall structure and composition of the tension wood, negatively affect CNF isolation when using TEMPO-mediated oxidation followed by mechanical nanofibrillation. Unexpectedly, high wood lignin content facilitated CNF isolation, potentially through increased cell wall porosity caused by TEMPO-mediated delignification. Taken together, the results show that native wood properties affect CNF isolation as well as CNF properties and motivate for further genetic improvement of trees and wood as a raw material for nanocellulose production.

Authors/Creators:Bünder, Anne
Title:The biology and properties of wood for nanocellulose production
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2021
Number of Pages:95
Publisher:Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-823-3
ISBN for electronic version:978-91-7760-824-0
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Wood Science
Keywords:CELULOSE SYNTHASE-INTERACTING1 (CSI1), Cellulose microfibrils (CMFs), Secondary cell wall (SCW), Wood mechanical properties, Degree of polymerization (DP), Nanocellulose, Cellulose nanofibrils (CNFs), TEMPO-oxidation, Populus
Permanent URL:
ID Code:25573
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Genetics and Plant Physiology
Deposited By: SLUpub Connector
Deposited On:07 Oct 2021 12:25
Metadata Last Modified:07 Oct 2021 12:31

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