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Investigation of Photo-Induced Discoloration on Wood Treated with the Polyphenols from Acacia Confusa Heartwood
Journal of Wood Chemistry and Technology ( IF 2 ) Pub Date : 2019-03-07 , DOI: 10.1080/02773813.2019.1578376
Tzu-Cheng Chang, Ting-Feng Yeh, Shang-Tzen Chang

Previous studies have clearly demonstrated that the polyphenols of the ethyl acetate (EtOAc) fraction in the heartwood extract from Acacia confusa (AcHWE) had good photostabilities to prevent photodegradation of wood. The wood photostabilizing actions of condensed tannins and flavonoids from the EtOAc fraction in AcHWE have been individually established, but the effects of these polyphenols on photo-induced discoloration are unknown and merit investigation. The results of this study showed that the six sub-fractions (EA1–EA6), which were fractionated from the EtOAc fraction in AcHWE and contained various condensed tannins and flavonoids, caused different photo-induced discoloration of treated wood. Treating the wood with abundant condensed tannins with little or no flavones and flavonols gave a dramatic dark reddish discoloration after irradiation. Treating the wood with abundant flavones and flavonols with/without condensed tannins produced a moderate dark reddish discoloration with faded yellow tone after irradiation. However, if there are abundant flavanones in the treated wood, their flavanones could transform to chalcones, which increased the yellow tone of treated wood surfaces after initial irradiation. These results illustrated explicit discoloration tendencies for polyphenols in the photodegradation processes for wood and can be the references for further applications.

中文翻译:

相思心材多酚处理木材光致变色的研究

先前的研究已经清楚地表明,来自相思木 (AcHWE) 的心材提取物中的乙酸乙酯 (EtOAc) 部分的多酚具有良好的光稳定性,可以防止木材的光降解。AcHWE 中 EtOAc 部分的缩合单宁和黄酮类化合物的木材光稳定作用已被单独确定,但这些多酚对光致变色的影响尚不清楚,值得研究。这项研究的结果表明,从 AcHWE 中的 EtOAc 馏分中分离出来的六个亚馏分 (EA1-EA6) 会导致处理过的木材发生不同的光致变色。用含有少量或不含黄酮类和黄酮醇的丰富的缩合单宁处理木材,在辐照后呈现出戏剧性的深红色变色。用含有/不含缩合单宁的丰富黄酮和黄酮醇处理木材,在辐照后会产生中度的暗红色变色和褪色的黄色调。然而,如果处理过的木材中含有丰富的黄烷酮,它们的黄烷酮会转化为查耳酮,这增加了初始照射后处理过的木材表面的黄色调。这些结果说明了木材光降解过程中多酚的明显变色趋势,可以作为进一步应用的参考。这增加了初始照射后处理过的木材表面的黄色调。这些结果说明了木材光降解过程中多酚的明显变色趋势,可以作为进一步应用的参考。这增加了初始照射后处理过的木材表面的黄色调。这些结果说明了木材光降解过程中多酚的明显变色趋势,可以作为进一步应用的参考。
更新日期:2019-03-07
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