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Effect of Physisporinus vitreus on wood properties of Norway spruce. Part 2: Aspects of microtensile strength and chemical changes

Lehringer, Christian ; Saake, Bodo ; Živković, Vjekoslav ; Richter, Klaus ; Militz, Holger

In: Holzforschung, 2011, vol. 65, no. 5, p. 721-727

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    Titre
    • Effect of Physisporinus vitreus on wood properties of Norway spruce. Part 2: Aspects of microtensile strength and chemical changes
    Auteur
    • Lehringer, Christian. Empa - Swiss Federal Laboratories for Materials Science and Technology, Wood Laboratory, Dübendorf, Switzerland
    • Saake, Bodo. Department of Wood Science, University of Hamburg, Chemical Wood Technology, Hamburg, Germany
    • Živković, Vjekoslav. Faculty of Forestry, Department of Wood Technology, University of Zagreb, Zagreb, Croatia
    • Richter, Klaus. Empa - Swiss Federal Laboratories for Materials Science and Technology, Wood Laboratory, Dübendorf, Switzerland
    • Militz, Holger. Wood Biology and Wood Products, Burckhardt-Institute, Georg-August-University, Göttingen, Germany
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Holzforschung, 2011, vol. 65, no. 5, p. 721-727. Walter de Gruyter
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:293037
    Summary
    The biotechnological application of the white rot fungus Physisporinus vitreus named "bioincising” is currently being investigated for permeability improvement of Norway spruce (Picea abies (L.) Karst.) wood. During short-term (<9weeks) incubation, fungal activity induces degradation of pit membranes and a simultaneous alteration of the tracheid cell wall structure. In Part 1 of this article series, the occurrence of selective delignification and simultaneous degradation was shown by UV-microspectrophotometry (UMSP). Moreover, significant reduction of Brinell hardness was recorded after 7 and 9weeks incubation. For a better understanding of the chemical alterations in the wood constituents and the corresponding changes of mechanical properties due to fungal activity, we applied microtensile tests on thin strips that were prepared from the surface of incubated Norway spruce wood. Indications for the occurrence of selective delignification and simultaneous degradation were evident. Determination of lignin content and carbohydrate analysis by borate anion exchange chromatography confirmed the results. The present study verifies the findings from Part 1 of this article series and from previously conducted microscopic investigations. Now, the degradation characteristics of P. vitreus are established and the bioincising process can be further optimized with higher reliability