Protecting wood from mould, decay, and termites with multi-component biocide systems

Abstract

Biocides must be developed for controlling mould establishment on cellulose-based building materials. Accordingly, biocides intended for indoor applications must be non-toxic, non-volatile, odourless, hypoallergenic, and able to provide long-term protection under conditions of high humidity. Multi-component biocide systems were tested in American Wood-Preservers' Association soil block tests for inhibition of brown-rot and white-rot decay fungi and American Society for Testing and Materials standard tests for inhibition of mould fungi and termites. Multi-component systems combining a borate base supplemented with either 0.1% azole or 0.5% thujaplicin, performed well against the two brown-rot fungi Postia placenta and Gloeophyllum trabeum; the white-rot fungus Coriolus versicolor; the three mould fungi Aspergillus niger, Penicillium chrysogenum, and Trichoderma viride; and the subterranean termite Reticulitermes flavipes (Kollar). It was concluded that for interior applications borate-based multi-component biocide systems can protect wood from decay fungi, mould fungi, and termites, and that a system containing thiabendazole provided protection at a lower retention than the other biocides in this study. Synergy was observed between the borate base and voriconazole in inhibition of mould. Published by Elsevier Ltd.

Antifungal properties of silver nanoparticles against indoor mould growth

“…Additionally, the chemistry of such agents should provide long-term protection, especially in environments that promote fungal growth (e.g. high humidity) (Clausen and Yang, 2007;Jarvis and Miller, 2005;Shoemaker and House, 2005). The presence of the fungal species leads to biological corrosion of the building materials.…”

Antifungal activity and humidity sensitivity of quaternized cellulose synthesized in NaOH/urea aqueous solution

“…Thirdly, 20 lL of 1-2 9 10 4 colonyforming unit (CFU)/mL fungal aqueous suspension was added into 1.5 mL finger tub, followed by adding Scheme 1 Chemical structure of quaternized cellulose (2012) 19:189-198 191 AFNM to reach a total volume of 1.5 mL. After inoculation, the fungal was incubated at 26.5°C for 30 h in an incubator (Valencia-Chamorro et al 2008;Clausen and Yang 2007). Inoculation of 1-2 9 10 4 CFU/mL fungal aqueous suspensions in FNM was run as blank control.…”

Characterization of pacific silver fir impregnated with extractives from western redcedar

“…Several researchers have investigated the possibility of removing extractives from durable species and impregnating them into sapwood, or non-durable heartwoods from other species (Southam and Ehrlich 1943, Anderson et al 1958, Rudman 1962, Yamamoto and Hong 1988, Hart 1989, Turner and Conradie 1995, Diouf et al 2002, Clausen and Yang 2007, Li et al 2012, Kirker et al 2013, Silviera et al 2017. This approach has met with mixed results; the durability of extractive-impregnated wood was usually equal to or lower than that of the heartwood from which the compounds were sourced.…”