刺槐在预处理条件下抽出物对诱发变色的影响

Preliminary Study on the Effect of Extractives in Induced Discoloration of Silver Chain under Pretreatment

[目的]研究刺槐木材丙酮抽出物在诱发变色过程中所起的作用。[方法]通过对刺槐木材变色前后丙酮抽出物的定性分析,得出变色前后丙酮抽出物的主要成分,进行对比分析,初步得出抽出物对诱发变色的作用。[结果]刺槐在预处理条件下,丙酮抽出物成分发生了变化,羟基、羧基等助色基团在预处理条件下氧化成羰基、酯基等发色基团,且丙酮抽出物的主要成分中含有大量发色基团和助色基团。[结论]羟基、羧基等助色基团在预处理条件下氧化成羰基、酯基等发色基团,使木材的颜色加深;刺槐木材丙酮抽出物的主要成分中含有大量发色基团和助色基团,这些基团间的相互作用使木材颜色加深。

[Objective]The research aimed to study the effect of the acetone extractives of silver chain wood during inducing discoloration under the pretreatment conditions.[Method]The qualitative analysis to the acetone extractives of silver chain wood before and after discoloring was carried on showing the main components of the acetone extractives and then taking comparison.[Result]Under the pretreatment conditions,the content of acetone extractives transformed.The hydroxyl and carboxyl,belonging to auxochromic groups,were oxidized into the carbonyl and ester groups.Also,there were plenty of auxochromic groups and chromophoric groups in the acetone extractives of silver chain.[Conclusion]The hydroxyl and carboxyl,belonging to auxochromic groups,were oxidized into the carbonyl and ester groups,belonging to chromophoric groups,during inducing discoloration under the pretreatment conditions,which makes the wood color deeper.There were plenty of auxochromic groups and chromophoric groups in the acetone extractives of silver chain.The interaction between the auxochromic groups and the chromophoric groups made the wood color deeper.