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

The biotechnological application of the white rot fungus Physisporinus vitreus named "bioincising" is being currently investigated for permeability improvement of Norway spruce (Picea abies (L.) Karst.) wood. During short term (< 9 weeks) 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 9 weeks incubation. In order to better understand the chemical alterations of the wood constituents due to fungal activity and the corresponding changes of mechanical properties 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. The results help to better understand the degradation characteristics of P. vitreus and contribute to an enhancement of the bioincising process.

chemical analysis; finite span; selective delignification; simultaneous degradation; zero span

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