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Distribution of low-molecular lipophilic extractives beneath the surface of air- and kiln-dried Scots pine sapwood boards
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.ORCID-id: 0000-0001-7864-8091
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.ORCID-id: 0000-0002-7711-9267
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.ORCID-id: 0000-0002-3544-8716
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.ORCID-id: 0000-0003-2247-674x
Vise andre og tillknytning
2018 (engelsk)Inngår i: PLOS ONE, E-ISSN 1932-6203, Vol. 13, nr 10, artikkel-id e0204212Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

During industrial wood drying, extractives migrate towards the wood surfaces and make the material more susceptible to photo/biodegradation. The present work provides information about the distribution, quantity and nature of lipophilic substances beneath the surface in air- and kiln-dried Scots pine (Pinus sylvestris L.) sapwood boards. Samples were taken from knot-free sapwood surfaces and the composition of lipophilic extractives, phenols and low-molecular fatty/resin acids layers at different nominal depths below the surface was studied gravimetrically, by UV-spectrometry and by gas chromatography-mass spectrometry (GC-MS). 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. The scatter in the values for the lipophilic extractives was high in both drying types, being highest for linoleic acid and slightly lower for palmitic, oleic and stearic acids. The amount of fatty acids was low in kiln-dried boards, probably due to a stronger degradation due to the high temperature employed. The most abundant resin acid was dehydroabietic acid followed by pimaric, isopimaric, and abietic acids in both drying types. It is concluded that during kiln-drying a migration front is created at a depth of 0.25 mm with a thickness of about 0.5 mm.

sted, utgiver, år, opplag, sider
PLOS , 2018. Vol. 13, nr 10, artikkel-id e0204212
HSV kategori
Forskningsprogram
Träteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-71200DOI: 10.1371/journal.pone.0204212ISI: 000446921100033PubMedID: 30303988Scopus ID: 2-s2.0-85054716404OAI: oai:DiVA.org:ltu-71200DiVA, id: diva2:1255632
Prosjekter
Experimental studies of capillary phenomena in bio-based materialsFungal growth on modified wood-based products under subarctic conditionsModWoodLifeUnderstanding wood modification through an integrated scientific and environmental impact approach
Forskningsfinansiär
Swedish Research Council
Merknad

Validerad;2018;Nivå 2;2018-10-29 (svasva)

Tilgjengelig fra: 2018-10-13 Laget: 2018-10-13 Sist oppdatert: 2023-09-05bibliografisk kontrollert
Inngår i avhandling
1. Characterization of Mould Fungi Growth on Scots Pine Sapwood Surfaces
Åpne denne publikasjonen i ny fane eller vindu >>Characterization of Mould Fungi Growth on Scots Pine Sapwood Surfaces
2019 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Luleå: Luleå tekniska universitet, 2019
HSV kategori
Forskningsprogram
Träteknik
Identifikatorer
urn:nbn:se:ltu:diva-73793 (URN)978-91-7790-380-2 (ISBN)978-91-7790-381-9 (ISBN)
Presentation
2019-06-12, A193, Forskargatan 1, Skellefteå, 09:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2019-05-02 Laget: 2019-04-30 Sist oppdatert: 2023-09-05bibliografisk kontrollert
2. Effectiveness and Evaluation of Wood Protection against Biological Deterioration Caused by Filamentous Fungi
Åpne denne publikasjonen i ny fane eller vindu >>Effectiveness and Evaluation of Wood Protection against Biological Deterioration Caused by Filamentous Fungi
2021 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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. 

sted, utgiver, år, opplag, sider
Luleå: Luleå University of Technology, 2021
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
HSV kategori
Forskningsprogram
Träteknik
Identifikatorer
urn:nbn:se:ltu:diva-87553 (URN)978-91-7790-960-6 (ISBN)978-91-7790-961-3 (ISBN)
Disputas
2021-12-17, A193, Skelleftea, 00:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2021-10-19 Laget: 2021-10-19 Sist oppdatert: 2021-11-26bibliografisk kontrollert

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