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UV light impact on ellagitannins and wood surface colour of European oak (Quercus petraea and Quercus robur)

机译:紫外线对欧洲橡木(栎栎和栎栎)的鞣花单宁和木质表面颜色的影响

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摘要

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.
机译:两种欧洲橡木树种(Q. petraea和Q. robur)具有高含量的酚,这些酚可能参与紫外线辐射下的颜色变化。为了研究橡木表面的光降解过程,在紫外线照射之前和之后,通过HPLC定量分析了两种橡木树种的提取物维斯卡林,维他命C,鞣花酸和没食子酸。照射时间在3、24、72、96、120、144、192和216 h之间更改。同时,通过测量CIELAB参数(DL〜*,Da〜*,Db〜*和DE〜*),在120小时的紫外线照射后,观察橡木表面的颜色变化。我们观察到,在最大暴露时间后,萃取物中总酚含量的60%下降。我们的研究结果还表明,卡斯塔拉金和没食子酸在216小时后被破坏,维斯卡林和鞣花酸在72小时后被破坏。这项研究证明了橡木提取物的光敏性,这是对木质素降解的补充,会强烈导致橡木心材变色。

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