Natural and preservative-treated durability of Populus nigra cv Italica timber grown in Santa Cruz Province, Argentina

Diaz, B.; Murace, Mónica Adriana; Peri, Pablo Luís; Keil, Gundolf; Luna, Leticia Bravo; Otaño, Marcelo

doi:10.1016/s0964-8305(03)00034-9

Cited by 7 publications

(6 citation statements)

References 6 publications

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“…This increase in the resistance of the wood upon treatment validates the formulations for wood protection. The above discussed increase of the wood durability upon the treatment with the tebuconazole formulation is similar to that obtained for Populus nigra wood treated with chromated copper arsenate (CCA), which is considered a very effective preservative, by vacuum-pressure [61]. However, considering the current restrictions associated with the use of CCA, the obtained results offer a very interesting opportunity for substituting CCA for a more eco-sustainable formulations for wood protection [72,73].…”

Section: Evaluation Of the Protection Of Impregnated Wood Against White-and Brown-rot Decay Caused By Fungussupporting

confidence: 65%

“…[60]. For the aim of this work, the specifications of the standard were modified in terms of the size of wood samples and xylophagous strains as was proposed by several authors [61][62][63][64]. Treated and untreated Populus canadensis I-214 clone wood samples, referred to as test material (TM), with dimensions 20 × 20 × 20 mm 3 and free of defects were used for biodegradation assays.…”

Section: Efficacy Against White-and Brown-rot Fungimentioning

confidence: 99%

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Oil in Water Nanoemulsions Loaded with Tebuconazole for Populus Wood Protection against White- and Brown-Rot Fungi

Lucı́a

Murace

Sartor

et al. 2021

Forests

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Eugenol in water nanoemulsions loaded with tebuconazole appear as a very promising alternative formulations for wood protection against xylophagous fungi that are the main species responsible for different rots in wood structures. The dispersions as prepared and upon dilution (impregnation mixtures) were characterized by the apparent hydrodynamic diameter distribution of the oil droplets loaded with tebuconazole and their long-term stability. The impregnation mixtures were applied on wood of Populus canadensis I-214 clone by using a pressure-vacuum system, and the effectiveness against fungal degradation by Gloeophyllum sepiarium and Pycnoporus sanguineus fungi was determined. The retention of tebuconazole in wood was about 40% of the amount contained in the impregnation mixtures. The results showed that the impregnation process leads to a long-term antifungal protection to the wood, with the mass loss after 16 weeks being reduced more than 10 times in relation to the control (untreated poplar wood) and the reference wood (untreated beech wood).

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Section: Evaluation Of the Protection Of Impregnated Wood Against White-and Brown-rot Decay Caused By Fungussupporting

confidence: 65%

Section: Efficacy Against White-and Brown-rot Fungimentioning

confidence: 99%

Oil in Water Nanoemulsions Loaded with Tebuconazole for Populus Wood Protection against White- and Brown-Rot Fungi

Lucı́a

Murace

Sartor

et al. 2021

Forests

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“…These fast-growing species have a significant economic impact, given that their wood is used for the production of pulp, panels, and many other commercial applications [1][2][3], in addition to being very important from an environmental perspective [4]. According to EN 350:2016, poplar wood is non-durable, and some studies have shown that it is highly susceptible to Trametes versicolor [5,6]. The fungal hyphae propagate through the woody elements, vessels, and tracheids of the sapwood, feeding on the constituents of the cell wall (lignin and structural carbohydrates) through the secretion of enzymes capable of metabolizing these structures [7].…”

Section: Introductionmentioning

confidence: 99%

White-Rot Fungi Control on Populus spp. Wood by Pressure Treatments with Silver Nanoparticles, Chitosan Oligomers and Propolis

Casado-Sanz

Silva-Castro

Ponce-Herrero

et al. 2019

Forests

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There is growing interest in the development of non-toxic, natural wood preservation agents to replace conventional chemicals. In this paper, the antifungal activities of silver nanoparticles, chitosan oligomers, and propolis ethanolic extract were evaluated against white-rot fungus Trametes versicolor (L.) Lloyd, with a view to protecting Populus spp. wood. In order to create a more realistic in-service type environment, the biocidal products were assessed according to EN:113 European standard, instead of using routine in vitro antimicrobial susceptibility testing methods. Wood blocks were impregnated with the aforementioned antifungal agents by the vacuum-pressure method in an autoclave, and their biodeterioration was monitored over 16 weeks. The results showed that treatments based on silver nanoparticles, at concentrations ranging from 5 to 20 ppm, presented high antifungal activity, protecting the wood from fungal attack over time, with weight losses in the range of 8.49% to 8.94% after 16 weeks, versus 24.79% weight loss in the control (untreated) samples. This was confirmed by SEM and optical microscopy images, which showed a noticeably higher cell wall degradation in control samples than in samples treated with silver nanoparticles. On the other hand, the efficacy of the treatments based on chitosan oligomers and propolis gradually decreased over time, which would be a limiting factor for their application as wood preservatives. The nanometal-based approach is thus posed as the preferred choice for the industrial treatment of poplar wood aimed at wood-based engineering products (plywood, laminated veneer lumber, cross-laminated timber, etc.).

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“…These fast-growing trees therefore have a large economic impact worldwide, together with a significant importance from an environmental perspective [32]. According to EN 350:2016 rule, poplar wood is a non-durable species [33], and some studies have evidenced that it is highly susceptible to Trametes versicolor [34,35]. Therefore, chitosan-based composites can be applied as a potential tool to avoid the white-rot decay of Populus spp.…”

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confidence: 99%

Chitosan-Based Coatings to Prevent the Decay of Populus spp. Wood Caused by Trametes Versicolor

et al. 2018

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Chitosan and chitosan oligomers are receiving increasing attention due to their antimicrobial properties. In the present study, they were assayed as a preventive treatment against white-rot decay of Populus wood (very important in economic and environmental terms), caused by Trametes versicolor fungus. Their capacity to incorporate different chemical species into the polymer structure with a view to improving their anti-fungal activity was also assessed by mixing oligo-chitosan with propolis and silver nanoparticles. The minimum inhibitory concentration of medium-molecular weight chitosan (MMWC), chitosan oligomers (CO), propolis (P), nanosilver (nAg), and their binary and ternary composites against T. versicolor was determined in vitro. Although all products exhibited anti-fungal properties, composites showed an enhanced effect as compared to the individual products: 100% mycelial growth inhibition was attained for concentrations of 2.0 and 0.2 mg·mL −1 for the CO-P binary mixture, respectively; and 2 µg·mL −1 for nAg in the ternary mixture. Subsequently, MMWC, CO, CO-P and CO-P-nAg composites were tested on poplar wood blocks as surface protectors. Wood decay caused by the fungus was monitored by microscopy and vibrational spectroscopy, evidencing the limitations of the CO-based coatings in comparison with MMWC, which has a higher viscosity and better adhesion properties. The usage of MMWC holds promise for poplar wood protection, with potential industrial applications. Coatings 2018, 8, 415 2 of 15its main characteristics, such as its bioactivity, non-toxicity or biodegradability, its antimicrobial effect is especially relevant [4][5][6]. Its activity against different fungi, gram positive and gram negative bacteria, is ascribed to the positive charge of amino group (NH 3 + ), which interacts electrostatically with the surface of the cellular membrane, destabilizing it. As a consequence, the presence of chitosan inside the cell can lead to intracellular responses such as inactivation or blocking of enzymes activities, and of DNA transcription and translation [7,8].The antifungal activity of chitosan not only depends on the fungus species, but also on its molecular weight (MW), polymerization degree (PD) or deacetylation degree (DD). For instance, chito-oligosaccharides with low MW, PD and DD have been reported to be more effective on phytopathogenic fungi than chitosan with higher MW, PD or DD [9][10][11].Another known advantage from chitosan and its oligomers is associated with their sorption and chelating properties. The cationic nature of the polymer allows it to bind to different chemicals species, ranging from organic macromolecules to metal nanoparticles [12][13][14]. Natural oils or extracts of natural products can be incorporated into the chitosan matrix, for example, by cross-linking, producing solutions, films or beads [15][16][17]. In the particular case of propolis, its polyphenols have been reported to form hydrogen bonds and covalent bonds with the functional groups in chitosan [18]. This results...

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Natural and preservative-treated durability of Populus nigra cv Italica timber grown in Santa Cruz Province, Argentina

Cited by 7 publications

References 6 publications

Oil in Water Nanoemulsions Loaded with Tebuconazole for Populus Wood Protection against White- and Brown-Rot Fungi

Oil in Water Nanoemulsions Loaded with Tebuconazole for Populus Wood Protection against White- and Brown-Rot Fungi

White-Rot Fungi Control on Populus spp. Wood by Pressure Treatments with Silver Nanoparticles, Chitosan Oligomers and Propolis

Chitosan-Based Coatings to Prevent the Decay of Populus spp. Wood Caused by Trametes Versicolor

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