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Topochemical and light microscopic investigations of non-enzymatic oxidative changes at the initial decay stage of furfuryl alcohol-modified radiata pine (Pinus radiata) degraded by the brown rot fungus Rhodonia placenta
Technische Universität München, Sweden.
Thünen Institute of Wood Research, Germany.
Technische Universität München, Sweden.
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. Technische Universität München, Sweden.ORCID iD: 0000-0003-2902-2257
2020 (English)In: International Biodeterioration & Biodegradation, ISSN 0964-8305, E-ISSN 1879-0208, Vol. 154, article id 105020Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to visualize non-enzymatic oxidative degradation damages in the initial decay stage of the brown rot fungus Rhodonia placenta degradation in furfuryl alcohol (FA) modified wood cell walls and untreated wood cell walls of radiata pine (Pinus radiata) sapwood. A decay test with small wood blocks (1.5 × 1.5 × 5 mm³) of untreated and furfurylated radiata pine selected from two different furfurylation processes was performed until the first mass loss occurred. The samples were exposed to the brown rot fungus R. placenta, monitored by light microscopy and analyzed topochemically by cellular UV microspectrophotometry (UMSP). The results showed that the FA modification process directly influenced: i) the fungal colonization and hyphal growth, ii) the spectral UV behavior, and iii) degradation patterns of the entire cell wall layers. For the first time, UMSP area scans and selective line scans of individual cell wall regions provide topochemical insights into oxidative degradation at the initial decay stage of furfuryl alcohol-modified P. radiata visualizing oxidative degradation in situ. Knowledge of the initial decay stage of brown rot degradation in FA-modified wood compared to untreated wood extends our understanding of the brown rot decay processes of cell wall compounds. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 154, article id 105020
Keywords [en]
Furfurylation, Lignin modification, Rhodania placenta, UV microspectrophotometry (UMSP), Wood modification, Cells, Cytology, Decay (organic), Forestry, Uranium metallography, Vanadium metallography, Wood, Cell wall layers, Degradation patterns, Fungal colonization, Furfuryl alcohol, Individual cells, Modification process, Oxidative degradation, Biodegradation, chemical composition, coniferous tree, decomposition, enzyme activity, fungus, microscopy, oxidation, Fungi, Pinus radiata, Radiata
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-48300DOI: 10.1016/j.ibiod.2020.105020Scopus ID: 2-s2.0-85090020818OAI: oai:DiVA.org:ri-48300DiVA, id: diva2:1465848
Available from: 2020-09-10 Created: 2020-09-10 Last updated: 2021-06-08Bibliographically approved

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