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  • Evaluation of Oak bark extracts as bio-based preservative agents in wood protection [Elektronski vir]
    Herrera Diaz, Rene Alexander ...
    Bark represents a major by-product of the forestry sector and is often referred to low value uses such as combustion for energy, soil mulching or animal bedding. Nevertheless, bark contains a wide ... array of bioactive constituents, offering considerable potential for transformation into value- added wood protection agents. Developing sustainable wood treatments based on these natural compounds aligns with circular economy principles and reduces dependence on synthetic biocides. In this study, selected bark extracts were explored for their antifungal activity against common wood-degrading fungi to assess their suitability for eco-friendly wood preservation strategies. Residual wet outer oak bark (Quercus robur) was dried, milled and subjected to three extractions methods: aqueous, organic solvent, and alkaline. A rotary evaporator was used for aqueous extraction, ultrasonic-assisted extraction (UAE) for the organic solvent, and a pressure reactor for the alkaline process. The extracts were physicochemical characterised and formulated into water- based treatment solutions, which were applied to wood specimens via vacuum-pressure impregnation. Scots pine (Pinus sylvestris) and beech (Fagus sylvatica) samples were treated and evaluated for leachability and resistance against white and brown rot fungi. Results showed differences in extract concentration and composition, depending on the extraction method. Alkaline extraction yielded the highest concentrations, while aqueous and solvent extractions were lower. Regarding the wood impregnation, treatments containing alkaline-based extracts exhibited higher leachability than the other two extracts. which showed similar performance. Fungal decay resistance varied by wood species. In P. sylvestris, solvent extracts treatments were particularly effective, with no visible degradation by Rhodonia placenta or Trametes versicolor. In F. sylvatica, all treatments reduced decay from R. placenta or T. versicolor compared to controls, with complete inhibition of R. placenta by the solvent extracts and reduced decay from both fungal strains with alkaline extracts. This research highlights the potential of bark waste as a valuable bioresource for sustainable wood protection. However, further optimisation of extract concentration and impregnation parameters is needed to enhance stability and long-term antifungal efficacy.
    Vir: IRG documents database and compendium [Elektronski vir] (1 spletni vir (1 datoteka PDF (6 str.)))
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2025
    Jezik - angleški
    COBISS.SI-ID - 260812803

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