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European Journal of Wood and Wood Products

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03.02.2023 | Original Article

Knot extractives responsible for the yellowing of white-coated pine wood

verfasst von: R. Coniglio, W. Gaschler, A. Dieste

Erschienen in: European Journal of Wood and Wood Products | Ausgabe 5/2023

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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.

Vorheriger Artikel Extractives in Douglas firs (Pseudotsuga menziesii (Mirb.) Franco) from three sites in south-west Germany and potential opportunities for valorization

Nächster Artikel Preliminary study of colorimetry as an auxiliary tool for Manilkara spp. wood discrimination

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Titel: Knot extractives responsible for the yellowing of white-coated pine wood
verfasst von: R. Coniglio
W. Gaschler
A. Dieste
Publikationsdatum: 03.02.2023
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Wood and Wood Products / Ausgabe 5/2023
Print ISSN: 0018-3768
Elektronische ISSN: 1436-736X
DOI: https://doi.org/10.1007/s00107-023-01938-3

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