Abstract
Opaque water-based coatings are prone to show discoloration when they are applied on knotted pine wood. This is seen as a yellow–brown spot, caused by the high concentration of specific wood extractives in the knots. Temperature and relative humidity cause the migration of these extractives through the coating while UV radiation may cause the discoloration of some of them. This work studied some of the extractives found in knots of Pinus cembra. Knotwood samples were subjected to Soxhlet extraction with hexane, ethanol, and acetone:water (95:5 v/v) and analyzed by high-pressure liquid chromatography and mass spectroscopy. Wood boards of P. cembra were painted with a commercial white water-based coating and subjected to accelerated ageing. The yellowed coating was scraped off and analyzed by infrared spectroscopy and high-pressure liquid chromatography and mass spectroscopy. Two stilbenes, five lignans and two flavonoids were detected in the polar knot extracts and their presence was confirmed in the discolored coating over the knots.
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The data that support the findings of this study are available from the corresponding author, RC, upon reasonable request.
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Acknowledgements
The authors would like to thank BASF, Germany, for financing this project, and the National Research and Innovation Agency of Uruguay (ANII) for the financial support of the first author’s studies.
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Conceptualization: RC, WG, AD; methodology: RC, WG, AD; formal analysis and investigation: RC, WG; writing-original draft preparation: RC, AD; writing-review and editing: RC, WG, AD; funding acquisition: WG; supervision: WG, AD.
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Coniglio, R., Gaschler, W. & Dieste, A. Knot extractives responsible for the yellowing of white-coated pine wood. Eur. J. Wood Prod. 81, 1109–1117 (2023). https://doi.org/10.1007/s00107-023-01938-3
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DOI: https://doi.org/10.1007/s00107-023-01938-3