首页> 外文期刊>Journal of Wood Chemistry and Technology >Chemical Groups and Structural Characterization of Lignin via Thiol-Mediated Demethylation
【24h】

Chemical Groups and Structural Characterization of Lignin via Thiol-Mediated Demethylation

机译:硫醇介导的脱甲基木质素的化学基团和结构表征

获取原文
获取原文并翻译 | 示例
           

摘要

A new approach to increase the reactivity of lignin by thiol-mediated demethylation was investigated in this study. Demethylated lignin was characterized by the changes in its hydroxyl and methoxyl groups, molecular weight, and other properties using titration and spectroscopy methods including FT-IR, 'H NMR, UV, and GPC. The total, phenolic, and aliphatic hydroxyl contents in lignin increased while the methoxyl content decreased after demethylation reaction, which indicated the occurrence of demethylation reaction. The results from FT-IR and UV analysis also indicated that the kraft lignin in this study contains mainly guaiacyl moiety and demethylated lignin has a higher guaiacyl content than original lignin. The average molecular weight of lignin decreased after demethylation reaction due to the cleavage of ether linkages in lignin macromolecules. No severe degradation of lignin was observed during the demethylation reaction.
机译:在这项研究中,研究了一种通过硫醇介导的去甲基化提高木质素反应性的新方法。脱甲基木质素的特征在于其羟基和甲氧基,分子量和其他性质的变化,使用的是滴定和光谱学方法,包括FT-IR,1H NMR,UV和GPC。脱甲基反应后,木质素中的总,酚和脂肪族羟基含量增加,而甲氧基含量降低,这表明发生了脱甲基反应。 FT-IR和UV分析的结果还表明,该研究中的牛皮纸木质素主要包含愈创木脂基部分,并且去甲基化的木质素具有比原始木质素更高的愈创木脂含量。木质素的平均分子量在脱甲基反应后由于木质素大分子中醚键的裂解而降低。在脱甲基反应过程中,未观察到木质素的严重降解。

著录项

  • 来源
    《Journal of Wood Chemistry and Technology》 |2014年第2期|122-134|共13页
  • 作者单位

    Institute of Chemical Industry of Forestry Products, Research Institute of New Technology, CAF, Nanjing, China,Calhoun Research Station, Louisiana State University Agricultural Center, Calhoun, Louisiana, USA;

    Calhoun Research Station, Louisiana State University Agricultural Center, Calhoun, Louisiana, USA,School of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China;

    Institute of Chemical Industry of Forestry Products, Research Institute of New Technology, CAF, Nanjing, China;

    USDA Forest Service,Southern Research Station, Pineville, Louisiand,USA;

    Institute of Chemical Industry of Forestry Products, Research Institute of New Technology, CAF, Nanjing, China;

    Polymer Science Department, University of Akron, Akron, Ohio, USA;

    Institute of Chemical Industry of Forestry Products, Research Institute of New Technology, CAF, Nanjing, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biomaterials; demethylation; odorless thiol; nucleophilic substitution; lignin reactivity;

    机译:生物材料;脱甲基无味硫醇亲核取代;木质素反应性;

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