UV light impact on ellagitannins and wood surface colour of European oak (Quercus petraea and Quercus robur) |
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Authors: | S. Zahri C. Belloncle P. Pardon B. Charrier |
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Affiliation: | a Sylvadour, IUT des Pays de l’Adour, 371 rue du ruisseau, Mont de Marsan, France b Ecole Supérieure du Bois, Nantes, France c Institut du Pin, Talence, France d Université Bordeaux 1, Laboratoire de Chimie Organique et Organométallique, France |
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Abstract: | Two European oak species (Q. petraea and Q. robur) have a high content of phenols which may participate in the alteration of colour upon UV irradiation. To study the photodegradation process of oak surfaces, the two oak species extractives, vescalagin, castalagin, ellagic acid and gallic acid were analysed quantitatively by HPLC before and after UV irradiation. Irradiation time was altered between 3, 24, 72, 96, 120, 144, 192 and 216 h. In parallel, any colour changes of Oak wood surface was followed after 120 h of UV-irradiation by measuring CIELAB parameters (DL*, Da*, Db* and DE*). We observed that 60% of total phenol content of extractives decreased after the maximal exposure time. Our findings also showed that castalagin and gallic acid were destroyed after 216 h and vescalagin and ellagic acid after 72 h. This study proves the photosenibility of oakwood extractives which, supplementary to lignin degradation, would strongly result in the discolouration of oak heartwood. |
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Keywords: | Castalagin Ellagic acid Ellagitannins Gallic acid European oak Photodegradation Vescalagin Wood colour |
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