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Mould growth on building materials and the effects of borate-based preservatives Li, Raymond
Abstract
One of the difficulties in establishing causal roles for indoor mould growth and adverse health effects is that the growth, metabolism, and biological activity of moulds depend on the interaction of the moulds with their growth substrates and environment. Further, one of the approaches to preventing indoor mould growth is to treat building materials with preservatives. Borates are a class of preservatives with low toxicity that can be used to protect a variety of different materials. Objectives: The growth and metabolism of three moulds associated with indoor environment problems were investigated on untreated and borate-treated versions of six building materials. Methods: Untreated and treated specimens of Southern Yellow pine, lodgepole pine, pine oriented strandboard, aspen oriented strandboard, cellulose insulation, and gypsum board were inoculated with spores of S. chartarum (ATCC 201212), A. versicolor (ATCC 26939), or P . brevicompactum (ATCC 9056), and incubated at 20 - 23°C and - 100% relative humidity for 4 weeks. The visual appearance of mould growth and changes in the volatile organic compound profile were measured each week. Carbon dioxide production and ergosterol were measured at the end of the incubation period. Results: The building materials tested differed in their ability to support mould growth. S. chartarum did not grow on untreated or treated wood or wood composites. The pattern of volatile organic compounds produced by each mould depended on the growth substrate. Borates were effective at preventing or reducing mould growth, although O S B may require higher levels of treatment than currently used. A dose-response trend was observed with gypsum board. Sub-inhibitory levels o f borates did not stimulate the production of different volatile metabolites, suggesting the lack of stress metabolism. The use of different methods for evaluating growth revealed that there could be mould growth on materials that did not appear to be contaminated. Conclusions: Mould growth and metabolism is influenced by the specific mould-substrate interactions. Borate-based preservatives inhibit mould growth and do not appear to induce stress metabolism at sub-inhibitory concentrations. Further studies on other aspects of mould growth, such as mycotoxin production and the biological activity of spores, on treated and untreated building materials are needed.
Item Metadata
Title |
Mould growth on building materials and the effects of borate-based preservatives
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2005
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Description |
One of the difficulties in establishing causal roles for indoor mould growth and adverse health
effects is that the growth, metabolism, and biological activity of moulds depend on the
interaction of the moulds with their growth substrates and environment. Further, one of the
approaches to preventing indoor mould growth is to treat building materials with preservatives.
Borates are a class of preservatives with low toxicity that can be used to protect a variety of
different materials.
Objectives:
The growth and metabolism of three moulds associated with indoor environment problems were
investigated on untreated and borate-treated versions of six building materials.
Methods:
Untreated and treated specimens of Southern Yellow pine, lodgepole pine, pine oriented
strandboard, aspen oriented strandboard, cellulose insulation, and gypsum board were
inoculated with spores of S. chartarum (ATCC 201212), A. versicolor (ATCC 26939), or P .
brevicompactum (ATCC 9056), and incubated at 20 - 23°C and - 100% relative humidity for 4
weeks. The visual appearance of mould growth and changes in the volatile organic compound
profile were measured each week. Carbon dioxide production and ergosterol were measured at
the end of the incubation period.
Results:
The building materials tested differed in their ability to support mould growth. S. chartarum did
not grow on untreated or treated wood or wood composites. The pattern of volatile organic
compounds produced by each mould depended on the growth substrate. Borates were effective
at preventing or reducing mould growth, although O S B may require higher levels of treatment
than currently used. A dose-response trend was observed with gypsum board. Sub-inhibitory
levels o f borates did not stimulate the production of different volatile metabolites, suggesting
the lack of stress metabolism. The use of different methods for evaluating growth revealed that
there could be mould growth on materials that did not appear to be contaminated.
Conclusions:
Mould growth and metabolism is influenced by the specific mould-substrate interactions.
Borate-based preservatives inhibit mould growth and do not appear to induce stress metabolism
at sub-inhibitory concentrations. Further studies on other aspects of mould growth, such as
mycotoxin production and the biological activity of spores, on treated and untreated building
materials are needed.
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Genre | |
Type | |
Language |
eng
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Date Available |
2009-12-10
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0091964
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2005-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.