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Essential oils from Thymus spp. as natural biocide against common brown- and white-rot fungi in degradation of wood products: antifungal activity evaluation by in vitro and FTIR analysis

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European Journal of Wood and Wood Products Aims and scope Submit manuscript

Abstract

Use of wood products in bio-building is increasing because of the raw material’s sustainability and renewability. Degradation of wood by fungi is one of the most significant threats in the use of wooden structures. In the past, degradation was prevented by the application of wood preservatives or the use of durable tropical species. Therefore, wood preservation by fossil-based compounds and heavy metals is one of the major issues. This study evaluated the antifungal activity of four essential oils of thyme species (Thymus capitatus, Coridothymus capitatus, T. vulgaris, and T. vulgaris Demeter, collected from organic and biodynamic farms, respectively) against two white-rot fungi (Trametes versicolor and Pleurotus ostreatus) and two brown-rot fungi (Poria monticola and Gloeophyllum trabeum). The thyme varieties’ essential oils differed in their chemical composition, with either carvacrol, thymol or p-cymene as major components. All four essential oils showed good antifungal activities, in which T. capitatus was the most toxic when applied against P. monticola (MIC of 0.05) and the most efficient inhibiting the growth of the other fungal strains. Fourier transform infrared (FTIR) spectroscopy was applied to investigate fungal cell wall structure under control and stress conditions. The results are a further step towards more eco-friendly solutions for preserving less durable wood products more frequently used in bio-building.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The work wassupported by PORFESR 2014-2020 “BIOEDILCARBON: Protezione della bioedilizia in legno: IOT e nanomateriali per lo stoccaggio di carbonio” PROGETTO GRUPPI DI RICERCA REGIONE LAZIO (scientific responsible Manuela Romagnoli). The work was also partially supported by the “Departments of Excellence-2018” Program (Dipartimenti di Eccellenza) of the Italian Ministry of Education, University and Research, DIBAF-Department of University of Tuscia, Viterbo, Project “Landscape 4.0 – food, wellbeing and environment”. This study was carried out also in the frame of Rome Technopole Innovation Ecosystem (D.M. 1051 23.06.2022) and received funding from the European Union NextGenerationEU (Piano Nazionale di Ripresa e Resilienza—PNRR), DIBAF-Department of University of Tuscia. All authors declare no conflict of interest.

Funding

Regione Lazio, PORFESR 2014-2020 “BIOEDILCARBON: Protezione della bioedilizia in legno: IOT e nanomateriali per lo stoccaggio di carbonio”, Italian Ministry of Education, University and Research: “Departments of Excellence-2018” Program (Dipartimenti di Eccellenza) DIBAF-Department of University of Tuscia, Viterbo, Project “Landscape 4.0—food, wellbeing and environment”, European Union NextGenerationEU (Piano Nazionale di Ripresa e Resilienza): Rome Technopole Innovation Ecosystem.

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Conceptualization. A.M.V., F.Z. M.R., analysis M.B., A.M., F.Z., S.B., writing the first draft M.R. F.Z. A.M.V , M.B. and F.Z. prepared the figures and tables, Reviewing the manuscript A.M.V., F.Z., M.R.

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Correspondence to Florian Zikeli or Manuela Romagnoli.

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Vettraino, A.M., Zikeli, F., Humar, M. et al. Essential oils from Thymus spp. as natural biocide against common brown- and white-rot fungi in degradation of wood products: antifungal activity evaluation by in vitro and FTIR analysis. Eur. J. Wood Prod. 81, 747–763 (2023). https://doi.org/10.1007/s00107-022-01914-3

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  • DOI: https://doi.org/10.1007/s00107-022-01914-3

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