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The Influence of Four Commercial Wood-surface Treatments on Mould-fungi Growth in a Pure Culture
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0001-7864-8091
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0003-4335-8419
Martinsons Byggsystem AB.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-7711-9267
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2020 (English)In: Integrating sustainability and health in buildings through renewable materials: InnoRenew CoE International Conference 2020, InnoRenew CoE , 2020, p. 19-19Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

The increased concern regarding mould on wood-based building materials has raised a demand for sustainable biocidal treatments to protect early contamination during the construction stage of timber buildings. By providing surface protection for all type of wood-based construction elements already at the construction site will reduce the mould-associated risk for not only the construction elements but also for the indoor climate and dwellers at the use-stage of the building. The purpose was to test the protective effect of commercial water-based treatments containing different biocides on single mould fungi growth in pure culture.

Small specimens of Scots pine sapwood and heartwood, and Norway spruce were treated with four treatments, and a fungal test performed in 90 mm Petri plates. Two samples (treated and untreated control) placed on the plate with a distance between each other, and between, a fungal inoculum placed. Five pure cultures of fungi species used in the study: Aureobasidium sp., Trichoderma sp., Aspergillus sp., Cladosporium sp., Penicillium sp. The specimens exposed at the temperature of 24°C and relative humidity of 90%.

The treatments contained biocides, i.e.: treatment 1: tetramethylol acetylenediurea and iodopropynyl butyl carbamate (IPBC), treatment 2: mixture of several biocides (IPBC, benzisothiazolinone (BIT), methylisothiazolinone (MIT) and 5-chloro-2-methyl-1,2-thiazol-3-one (CMIT)/MIT mixture), treatment 3: IPBC; and treatment 4: mixture of propiconazole and IPBC.

The fungal growth observed in the untreated samples after four days of incubation, the specimens with treatment 4 attacked after eight days, when treatment 1 and 3 had free from fungal mycelia inhibition zone after 22 days of incubation. The moisture content after the test was similar for treated samples in plates with Aureobasidium sp., Aspergillus sp., Cladosporium sp., Penicillium sp., but was significantly higher for Trichoderma sp. The type of wood did not influence fungal growth in comparison to the type of treatment.

Place, publisher, year, edition, pages
InnoRenew CoE , 2020. p. 19-19
Keywords [en]
Biocide, wood, surface treatment, fungi, mould
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-81365OAI: oai:DiVA.org:ltu-81365DiVA, id: diva2:1500075
Conference
2nd InnoRenew CoE International Conference, 3 September, 2020, Izola, Slovenia(Online)
Funder
Swedish Research Council Formas, 2017-00419Vinnova, IPOS DP2Available from: 2020-11-11 Created: 2020-11-11 Last updated: 2023-09-05Bibliographically approved
In thesis
1. Effectiveness and Evaluation of Wood Protection against Biological Deterioration Caused by Filamentous Fungi
Open this publication in new window or tab >>Effectiveness and Evaluation of Wood Protection against Biological Deterioration Caused by Filamentous Fungi
2021 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Developing a holistic understanding of the biological deterioration of wooden material by fungi in the laboratory and outdoor conditions requires the development of new assessment procedures and tools that allow describing the process with maximum precision and accuracy. Environmental biodeterioration is a complex process including a combination of physical, chemical and biological changes, with many uncertainties limiting the predictability and effectiveness of selected preservatives after laboratory tests. Therefore, in the current thesis, the investigation of the effectiveness of selected wood process parameters and protection systems against fungal growth and evaluation of the applicability of near-infrared spectroscopy for wooden surfaces assessment under fungal attack were accomplished.  The mould attack on copper impregnated Scots pine sapwood regulated to a greater extent by planing depth than by the infection method. Air-borne contaminants can heavily occupy the unplaned surfaces, but the extent of such occupation could be reduced with planing and impregnation solutions. Despite the vulnerability of the differently planed and copper-impregnated wood towards mould fungi, mass loss of that wood degraded by white-rot Trametes versicolor was less than 5%. The distribution, quantity, and nature of lipophilic substances beneath the surface in the air- and kiln-dried Scots pine sapwood boards significantly influenced mould fungi attack. It was found that the concentration of total extractives was significantly higher in kiln-dried than in air-dried samples and was higher close to the surface than in the layers beneath. During kiln-drying, a migration front is created at a depth of 0.25 mm with a thickness of about 0.5 mm. The evidence from the previous study is committed to understanding the influence of extractives and other migrating compounds on the unplanned surface and, consequently, on mould growth on that surface of Scots pine sapwood subjected to air and kiln drying. Therefore, a multivariate regression model was developed.  The thermal modification at different temperatures of exotic African wood influenced the chemistry. Iroko wood demonstrated stabilisation of pH and different patterns of chemical changes compared to padouk.  The open process of wood treatment like heating-and-cooling (i.e. fully soaking heated wood in cold liquor allowing the liquor to penetrate wood partially) can improve wood performance by developing a protective layer beneath the surface on heat-induced curing. However, the applied methacrylic resin demonstrated effectiveness during laboratory testing for biodeterioration but did not perform efficiently during outdoor tests.  The test of available commercially of generally recognised as safe (GRAS) compounds and biocidal treatment in laboratory conditions revealed a moderate inhibition effect on protection against biodeterioration.  Hyperspectral imaging in the NIR region could be applied to classify thermally modified wood but not for air/kiln-dried Scots pine wood. The use of a portable microNIR spectrometer efficiently demonstrated the separation of no mould and mould specimens in laboratory tests of Scots pine and allowed classifying boards treated with commercial biocides after outdoor weathering. 

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2021
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-87553 (URN)978-91-7790-960-6 (ISBN)978-91-7790-961-3 (ISBN)
Public defence
2021-12-17, A193, Skelleftea, 00:00 (English)
Opponent
Supervisors
Available from: 2021-10-19 Created: 2021-10-19 Last updated: 2021-11-26Bibliographically approved

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Myronycheva, OlenaKim, InjeongKarlsson, OlovSehlstedt-Persson, MargotSandberg, Dick

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