Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 9, Issue 7, Pages 2684-2692Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c07742
Keywords
wood preservative; lignin nanocapsule; lignin fungicide; treatability; decay resistance
Categories
Funding
- Michigan Technological University
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The need for bio-based, sustainable wood preservatives in the modern forest industry is increasing. A water-dispersible, double-shell lignin nanocapsule encapsulating the fungicide propiconazole has been proven to have significant biocidal efficacy in pressure treatment, making it a potential antifungal wood preservative.
In the modern forest industry, the need for bio-based, renewable, and environmentally-benign wood preservatives is increasing. The world harvests approximately 1700 million m(3) of wood annually for use in a variety of applications. Unfortunately, when exposed to moisture, wood products are at high risk of decay by wood degrading fungi. Preservatives are used to prevent or limit decay, and there has been an increasing interest in developing wood preservatives from renewable materials. For this work, the effectiveness of water-dispersible, double-shell, lignin nanocapsules encapsulating the fungicide propiconazole, as a sustainable wood preservative, was evaluated. The system was tested for its biocidal efficacy against brown rot decay by Gloeophyllum trabeum in southern yellow pine wood using both dip and pressure treatments. The preservative successfully penetrated the wood block during pressure treatment, and following 3 months of soil-jar incubation, only wood blocks pressure-treated with either the double-shelled-propiconazole nanocapsule system or the conventional exterior wood preservative, chromated copper arsenate (CCA), showed less weight loss (19.95 +/- 2.05 and 16.40 +/- 3.80%, respectively) compared to the control (41.58 +/- 9.51%). Additionally, the novel preservative system exhibited enhanced antifungal resistance compared to its individual constituents, as confirmed with Kirby-Bauer disk diffusion tests. The double-shell lignin nanocapsule exhibited radical quenching activity against DPPH of 75.9 +/- 4.2%, and this could have contributed to the enhanced antifungal activity of the double-shell lignin nanocapsule-propiconazole system. This novel preservative system can be considered as a potential bio-based antifungal wood preservative.
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