...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Wood Chemistry and Technology >Evaluation of Chemical Composition of Eucalyptus Wood Extracts after Different Storage Times Using Principal Component Analysis
【24h】

Evaluation of Chemical Composition of Eucalyptus Wood Extracts after Different Storage Times Using Principal Component Analysis

机译：主成分分析法评价不同贮藏时间后桉木提取物的化学成分

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Deposits of wood extractives, commonly referred to as pitch, cause significant problems for the pulp and paper industries. The reduction of these extractives is an important strategy aspect used to minimize problems. The present work studied the effects of wood storage time on the amount and variation of chemical composition of extracts, before and after alkaline hydrolysis. Fatty acids, sterols, long-chain aliphatic alcohols, and aromatic compounds were the main chemical classes of substances found in all analyzed extractives, before and after hydrolysis. Hierarchical cluster analysis (HCA) and principal component analysis (PCA) were used to confirm the similarity of wood samples using groups directly correlated with the chemical composition. PCI explains approximately 99% of the total variance, and β-sitosterol was the major compound responsible for the groupings. The exploratory analysis of the extract samples after 20,40, 60,100,140, and 180 days of storage, before and after alkaline hydrolysis, showed that they were affected by the strong influence of β-sitosterol, which is derived from glucosteroids degradation by water present in the wood was the compound present in the largest amount in the extracts, before and after hydrolysis, as well as octadec-9-enoic acid can be oxidized at the double bond becoming more soluble in water and 3,4,5-trihydroxybenzoic acid, derived from lignin degradation by water present in the wood or microorganism attack, which were responsible for differentiating and clustering the storage time. These studies demonstrate that the best period of storage of the wood in the field is 60 days, because the reduction of the main compounds present in extracts (mainly β-sitosterol and octadec-9-enoic acid) was more significant.
机译：木材提取物的沉积物（通常称为沥青）对制浆和造纸行业造成重大问题。减少这些提取物是用于最小化问题的重要策略方面。本工作研究了碱水解前后木材储存时间对提取物的数量和化学成分变化的影响。脂肪酸，固醇，长链脂族醇和芳香族化合物是水解前后所有萃取物中发现的主要化学物质。层次聚类分析（HCA）和主成分分析（PCA）用于使用与化学成分直接相关的基团来确认木材样品的相似性。 PCI解释了约99％的总方差，而β-谷固醇是负责这些分组的主要化合物。在碱性水解前后，分别在20、40、60、100、140和180天后对提取物样品进行的探索性分析表明，它们受到β-谷甾醇的强烈影响，β-谷甾醇源自糖类固醇因水中的糖类固醇降解而产生。木材是水解前后萃取物中含量最大的化合物，而且十八碳九烯酸可被双键氧化，更易溶于水和3,4,5-三羟基苯甲酸，源自木材中木质素被水降解或微生物侵袭而降解的结果，这些因素可区分和聚集储存时间。这些研究表明，木材在田间的最佳保存期为60天，因为提取物中存在的主要化合物（主要是β-谷甾醇和十八碳9-烯酸）的减少更为显着。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号