Effect of pressurized hot water extraction on the resistance of Scots pine sapwood against mould fungi

Suvi Kyyrö; Michael Altgen; Tiina Belt; Hanna Seppäläinen; Christian Brischke; Petra Heinze; Holger Militz; Lauri Rautkari

doi:10.1515/hf-2022-0190

Effect of pressurized hot water extraction on the resistance of Scots pine sapwood against mould fungi

Suvi Kyyrö^*, Michael Altgen, Tiina Belt, Hanna Seppäläinen, Christian Brischke, Petra Heinze, Holger Militz, Lauri Rautkari

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

2 Citations (Scopus)

57 Downloads (Pure)

Abstract

The effects of pressurized hot water extraction (HWE) treatment on the mould resistance of wood have not been extensively investigated yet. The activity of the mould fungi is dependent on the availability of nutrients. Therefore, the soluble degradation products produced during HWE treatment could affect the wood's susceptibility to mould growth. Scots pine (Pinus sylvestris L.) sapwood specimens were treated with HWE at 140 °C for 1-5 h. Afterwards, the degradation products were either removed via leaching or the wood was dried without applying the leaching procedure. The surface layer (1.5 mm) was removed from half of the leached and non-leached specimens. The resistance of the specimens against mould growth was tested in an incubation chamber. HWE treated wood showed a higher susceptibility to mould growth when it was neither leached nor subjected to surface removal. The susceptibility of wood to mould fungi depended on the availability of hemicellulose-based degradation products produced during HWE treatment. These degradation products were removable via a leaching procedure, but also by removing the outermost layer of the wood. The results show the relevance of removing HWE degradation products located on the wood surface in improving resistance against mould growth.

Original language	English
Pages (from-to)	348-355
Journal	Holzforschung
Volume	77
Issue number	5
Early online date	15 Mar 2023
DOIs	https://doi.org/10.1515/hf-2022-0190
Publication status	Published - May 2023
MoE publication type	A1 Journal article-refereed

Funding

Research funding: Financial support from the Academy of Finland (grant No. 309881) and the South Savo Regional Council of the European Regional Development Fund (project code A7389) is acknowledged.

Keywords

carbohydrate migration
discolouration
hemicellulose-based derivatives
wood composition

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10.1515/hf-2022-0190Licence: CC BY

CHEM_Kyyrö_et_al_Effect_of_Pressurized_2023_HolzforschungFinal published version, 1.53 MBLicence: CC BY

Cite this

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title = "Effect of pressurized hot water extraction on the resistance of Scots pine sapwood against mould fungi",

abstract = "The effects of pressurized hot water extraction (HWE) treatment on the mould resistance of wood have not been extensively investigated yet. The activity of the mould fungi is dependent on the availability of nutrients. Therefore, the soluble degradation products produced during HWE treatment could affect the wood's susceptibility to mould growth. Scots pine (Pinus sylvestris L.) sapwood specimens were treated with HWE at 140 °C for 1-5 h. Afterwards, the degradation products were either removed via leaching or the wood was dried without applying the leaching procedure. The surface layer (1.5 mm) was removed from half of the leached and non-leached specimens. The resistance of the specimens against mould growth was tested in an incubation chamber. HWE treated wood showed a higher susceptibility to mould growth when it was neither leached nor subjected to surface removal. The susceptibility of wood to mould fungi depended on the availability of hemicellulose-based degradation products produced during HWE treatment. These degradation products were removable via a leaching procedure, but also by removing the outermost layer of the wood. The results show the relevance of removing HWE degradation products located on the wood surface in improving resistance against mould growth.",

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author = "Suvi Kyyr{\"o} and Michael Altgen and Tiina Belt and Hanna Sepp{\"a}l{\"a}inen and Christian Brischke and Petra Heinze and Holger Militz and Lauri Rautkari",

note = "Funding Information: Research funding: Financial support from the Academy of Finland (grant No. 309881) and the South Savo Regional Council of the European Regional Development Fund (project code A7389) is acknowledged. Publisher Copyright: {\textcopyright} 2023 the author(s), published by De Gruyter, Berlin/Boston 2023.",

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language = "English",

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AU - Kyyrö, Suvi

AU - Altgen, Michael

AU - Belt, Tiina

AU - Seppäläinen, Hanna

AU - Brischke, Christian

AU - Heinze, Petra

AU - Militz, Holger

AU - Rautkari, Lauri

N1 - Funding Information: Research funding: Financial support from the Academy of Finland (grant No. 309881) and the South Savo Regional Council of the European Regional Development Fund (project code A7389) is acknowledged. Publisher Copyright: © 2023 the author(s), published by De Gruyter, Berlin/Boston 2023.

PY - 2023/5

Y1 - 2023/5

N2 - The effects of pressurized hot water extraction (HWE) treatment on the mould resistance of wood have not been extensively investigated yet. The activity of the mould fungi is dependent on the availability of nutrients. Therefore, the soluble degradation products produced during HWE treatment could affect the wood's susceptibility to mould growth. Scots pine (Pinus sylvestris L.) sapwood specimens were treated with HWE at 140 °C for 1-5 h. Afterwards, the degradation products were either removed via leaching or the wood was dried without applying the leaching procedure. The surface layer (1.5 mm) was removed from half of the leached and non-leached specimens. The resistance of the specimens against mould growth was tested in an incubation chamber. HWE treated wood showed a higher susceptibility to mould growth when it was neither leached nor subjected to surface removal. The susceptibility of wood to mould fungi depended on the availability of hemicellulose-based degradation products produced during HWE treatment. These degradation products were removable via a leaching procedure, but also by removing the outermost layer of the wood. The results show the relevance of removing HWE degradation products located on the wood surface in improving resistance against mould growth.

AB - The effects of pressurized hot water extraction (HWE) treatment on the mould resistance of wood have not been extensively investigated yet. The activity of the mould fungi is dependent on the availability of nutrients. Therefore, the soluble degradation products produced during HWE treatment could affect the wood's susceptibility to mould growth. Scots pine (Pinus sylvestris L.) sapwood specimens were treated with HWE at 140 °C for 1-5 h. Afterwards, the degradation products were either removed via leaching or the wood was dried without applying the leaching procedure. The surface layer (1.5 mm) was removed from half of the leached and non-leached specimens. The resistance of the specimens against mould growth was tested in an incubation chamber. HWE treated wood showed a higher susceptibility to mould growth when it was neither leached nor subjected to surface removal. The susceptibility of wood to mould fungi depended on the availability of hemicellulose-based degradation products produced during HWE treatment. These degradation products were removable via a leaching procedure, but also by removing the outermost layer of the wood. The results show the relevance of removing HWE degradation products located on the wood surface in improving resistance against mould growth.

KW - carbohydrate migration

KW - discolouration

KW - hemicellulose-based derivatives

KW - wood composition

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U2 - 10.1515/hf-2022-0190

DO - 10.1515/hf-2022-0190

M3 - Article

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SN - 0018-3830

VL - 77

SP - 348

EP - 355

JO - Holzforschung

JF - Holzforschung

IS - 5

ER -

Effect of pressurized hot water extraction on the resistance of Scots pine sapwood against mould fungi

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Wood modification using pressurized hot water

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Effect of pressurized hot water extraction on the resistance of Scots pine sapwood against mould fungi

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Funding

Keywords

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Wood modification using pressurized hot water

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