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Isolation and modification of nano-scale cellulose from organosolv-treated birch through the synergistic activity of LPMO and endoglucanases
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-1336-2396
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0001-9164-7667
Department of Materials and Environmental Chemistry, Stockholm University, 10691 Stockholm, Sweden.
Department of Materials and Environmental Chemistry, Stockholm University, 10691 Stockholm, Sweden.
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2021 (English)In: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 183, p. 101-109Article in journal (Refereed) Published
Abstract [en]

Nanocellulose isolation from lignocellulose is a tedious and expensive process with high energy and harsh chemical requirements, primarily due to the recalcitrance of the substrate, which otherwise would have been cost-effective due to its abundance. Replacing the chemical steps with biocatalytic processes offers opportunities to solve this bottleneck to a certain extent due to the enzymes substrate specificity and mild reaction chemistry. In this work, we demonstrate the isolation of sulphate-free nanocellulose from organosolv pretreated birch biomass using different glycosyl-hydrolases, along with accessory oxidative enzymes including a lytic polysaccharide monooxygenase (LPMO). The suggested process produced colloidal nanocellulose suspensions (ζ-potential −19.4 mV) with particles of 7–20 nm diameter, high carboxylate content and improved thermostability (To = 301 °C, Tmax = 337 °C). Nanocelluloses were subjected to post-modification using LPMOs of different regioselectivity. The sample from chemical route was the least favorable for LPMO to enhance the carboxylate content, while that from the C1-specific LPMO treatment showed the highest increase in carboxylate content.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 183, p. 101-109
Keywords [en]
Nanocellulose, LPMO biocatalysis, Post-treatment modification/functionalization
National Category
Bioprocess Technology
Research subject
Biochemical Process Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-84130DOI: 10.1016/j.ijbiomac.2021.04.136ISI: 000674774100010PubMedID: 33905799Scopus ID: 2-s2.0-85105836621OAI: oai:DiVA.org:ltu-84130DiVA, id: diva2:1549241
Note

Validerad;2021;Nivå 2;2021-05-05 (alebob)

Available from: 2021-05-05 Created: 2021-05-05 Last updated: 2023-09-05Bibliographically approved

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Muraleedharan, Madhu NairKarnaouri, AnthiMatsakas, LeonidasRova, UlrikaChristakopoulos, Paul

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