Biological resistance of nanoclay-treated plastic composites with different bamboo contents to three types of fungi

The present study investigated the effects of exposure of bamboo–plastic composites to three aggressive fungi species on mass loss values. Polyvinyl chloride was used as the synthetic matrix of the composite. Three mixing combinations were used for bamboo–polymer composites, namely 40/60, 50/50, and 60/40. The injection-molded process was employed to produce the composites. Specimens were prepared according to modified European standard specifications (EN-113) to be exposed to white-, brown-, and soft-rot fungi each month for 4 months. The results indicated that the soft-rot fungus ( Chaetomium globosum) generally caused higher mass losses in all bamboo/plastic combination ratios. Brown- and soft-rot fungi demonstrated different mass losses on different combination ratios. However, the white-rot fungus ( Trametes versicolor) caused nearly the same mass losses on all three combination ratios. Moreover, T. versicolor was highly significant with respect to mass loss and moisture content. It can therefore be concluded that the T. versicolor has a different decay metabolism when compared to the brown- and soft-rot fungus used in this study.

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Outdoor Wood Mats-Based Engineering Composite: Influence of Process Parameters on Decay Resistance against Wood-Degrading Fungi Trametes versicolor and Gloeophyllum trabeum

Polymers ◽

10.3390/polym13183173 ◽

2021 ◽

Vol 13 (18) ◽

pp. 3173

Author(s):

Minzhen Bao ◽

Neng Li ◽

Yongjie Bao ◽

Jingpeng Li ◽

Hao Zhong ◽

...

Keyword(s):

Chemical Composition ◽

Mass Loss ◽

Process Parameters ◽

Trametes Versicolor ◽

Decay Resistance ◽

Resin Content ◽

White Rot ◽

White Rot Fungus ◽

Gloeophyllum Trabeum ◽

Influence Of Process Parameters

The process parameters significantly influence the preparation and final properties of outdoor wood mats-based engineering composite (OWMEC). During outdoor use, wood composites are susceptible to destruction by rot fungi. Herein, the role of process parameters such as density and resin content on OWMEC resistance to fungal decay was investigated. The poplar OWMEC samples were exposed to white-rot fungus Trametes versicolor and brown-rot fungus Gloeophyllum trabeum for a period of 12 weeks. The chemical composition, crystallinity, and morphology were evaluated to investigate the effect of process parameters on the chemical composition and microstructure of the decayed OWMEC. With an increase in the density and resin content, the mass loss of the decayed OWMEC decreased. The highest antifungal effect against T. versicolor (12.34% mass loss) and G. trabeum (19.43% mass loss) were observed at a density of 1.15 g/m3 and resin content of 13%. As results of the chemical composition and microstructure measurements, the resistance of OWMEC against T. versicolor and G. trabeum fungi was improved remarkably by increasing the density and resin content. The results of this study will provide a technical basis to improve the decay resistance of OWMEC in outdoor environments.

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Investigation of fungal decay of poplar wood treated with pistachio resin

BioResources ◽

10.15376/biores.16.1.779-788 ◽

2020 ◽

Vol 16 (1) ◽

pp. 779-788

Author(s):

Maede Ahadnezhad ◽

Soheila Izadyar ◽

Davood Efhamisisi

Keyword(s):

Mass Loss ◽

Trametes Versicolor ◽

Populus Deltoides ◽

Treated Wood ◽

Brown Rot ◽

White Rot ◽

White Rot Fungus ◽

Poplar Wood ◽

Fungal Decay ◽

Brown Rot Fungus

The density, swelling, and fungal decay of poplar (Populus deltoides) wood treated with pistachio resin (PR) obtained from Pistacia atlantica were investigated. The white-rot fungus Trametes versicolor and the brown-rot fungus Coniophora puteana were used. Methanolic solutions of PR with different concentrations of 1%, 6%, 12%, and 15% were used as the preservative solution. Wood samples were saturated by two different vacuum/pressure (V/P) and dipping methods. The density, volumetric swelling of treated wood, and their mass loss (ML) caused by fungal decay were determined. The density of treated species increased to 15.4% and 5.8% for V/P and dipping methods, respectively, at 15% PR concentration. The volumetric swelling of the treated samples was reduced to 24.5% and 16.8% for V/P and dipping procedure, respectively, at 15% PR concentration. The mass loss of treated samples after exposure to T. versicolor was less than the untreated one (17.4% for V/P and 22.6% for dipping methods at 15% PR concentration). The results showed the better performance of V/P treatment in promotion of wood durability against fungal decay than the dipping method.

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Transformation of Textile Dyes by White-Rot Fungus Trametes versicolor

Applied Biochemistry and Biotechnology ◽

10.1385/abab:102-103:1-6:099 ◽

2002 ◽

Vol 102-103 (1-6) ◽

pp. 099-108 ◽

Cited By ~ 9

Author(s):

Haresh Keharia ◽

Datta Madamwar

Keyword(s):

Trametes Versicolor ◽

Textile Dyes ◽

White Rot ◽

White Rot Fungus

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Biotransformation of PAHs by the White Rot Fungus Trametes versicolor

Bioremediation of Contaminated Soils ◽

10.1201/9781482270235-29 ◽

2000 ◽

pp. 379-386

Keyword(s):

Trametes Versicolor ◽

White Rot ◽

White Rot Fungus

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Evaluation and identification of walnut heartwood extractives for protection of poplar wood

BioResources ◽

10.15376/biores.6.1.59-69 ◽

2010 ◽

Vol 6 (1) ◽

pp. 59-69

Author(s):

Seyyed Khalil Hosseini Hashemi ◽

Ahmad Jahan Latibari

Keyword(s):

Weight Loss ◽

Trametes Versicolor ◽

Juglans Regia ◽

White Rot ◽

White Rot Fungus ◽

Poplar Wood ◽

Vacuum Desiccator ◽

Highest Weight ◽

Complete Saturation ◽

Heartwood Extractives

Walnut (Juglans regia L.) heartwood extractives were identified and their potential for protection of poplar wood was evaluated. Test specimens were prepared from poplar wood (Populus nigra L.) to meet BS 838:1961 requirements. Samples were impregnated with heartwood extractive solution (1.5, 2.5, and 3.5% w/w in ethanol-toluene), followed by 5 hours vacuum desiccator technique to reach complete saturation. Impregnated specimens were exposed to white-rot fungus (Trametes versicolor) for 14 weeks according to BS 838:1961 applying the kolle-flask method. The weight loss of samples was determined after exposure to white-rot fungus. The highest weight loss (36.96%) was observed for untreated control samples and the lowest weight loss (30.40%) was measured in samples treated with 1.5% extractives solution. The analyses of the extracts using GC/MS indicated that major constituents are benzoic acid,3,4,5-tri(hydroxyl) and gallic acid (44.57 %). The two toxic components in the heartwood are juglone (5.15 %) and 2,7-dimethylphenantheren (5.81 %).

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