Abstract
This study investigated the efficacy of lauric arginate (LAE) as a potential preservative against wood deteriorating fungi. First, the antifungal properties of LAE against two brown rot fungi, Gloeophyllum trabeum (G.t.) and Rhodonia placenta (R.p.), and two white rot fungi, Trametes versicolor (T.v.) and Irpex lacteus (I.l.) were examined using malt-agar media as substrate. Then the biological resistance of LAE-treated wood specimens (10, 20, and 25 % LAE solutions) was tested following American Wood Protection Association (AWPA) E10 soil-block test procedures. The in vitro study showed LAE actively inhibited the growth of all the fungi tested compared to growth in control plates but there were no considerable changes observed in the morphology of fungi hyphae. Wood impregnated with LAE showed increased weight percent gain as a function of treatment concentration. Characterization of LAE-treated wood on a thermogravimetric analyzer showed LAE shifted the thermal degradation temperatures to lower stages but did not significantly improve the thermal stability of the treated specimen. LAE in wood significantly suppressed fungus growth, leading to decreased mass loss but it also leached out from wood specimens during fungi exposure.
Funding source: USDA McIntire-Stennis project
Award Identifier / Grant number: Accession number NI3551
Funding source: University of Idaho Office of Undergraduate Research (OUR) Summer Undergraduate Research Fellowship
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Author contributions: CA: performed the experiments, collected, analyzed the data, and wrote the draft manuscript; JC: performed the experiments, collected the data, and assisted in data analysis; AGM: supervised and assisted in finalizing the writing of the manuscript; LC: conceptualized the project idea, acquired the funds, performed part of the experiments, supervised, and finalized the writing of the manuscript. All authors have read the manuscript and approved the final version for publication.
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Research funding: This project was supported by the USDA McIntire-Stennis project under accession number NI3551 and the University of Idaho Office of Undergraduate Research (OUR) Summer Undergraduate Research Fellowship (SURF) Program. The authors also thank A&B Ingredients Inc. (Fairfield, NJ) for donating the lauric arginate. Any opinions, findings, conclusions, or recommendations expressed in the publication are those of the authors and do not necessarily reflect the view of the U.S. Department of Agriculture.
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Conflict of interest statement: The authors declare that they have no conflicts of interest regarding this article.
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Supplementary Material
This article contains supplementary material (https://doi.org/10.1515/hf-2023-0013).
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