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A possible explanation for the structural inhomogeneity of lignin in LCC networks

机译:LCC网络中木质素结构不均匀的可能解释

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摘要

Lignin has a very complex structure, and this is partly due to the monomers being connected by many different types of covalent bonds. Furthermore, there are multiple covalent bonds between lignin and polysaccharides in wood, and it is known that the structure of lignin covalently bound to the hemicellulose xylan is different to lignin bound to the hemicellulose glucomannan. Here, synthetic lignin (DHP) is synthesized at different pH and it is shown that lignin made at lower pH has a structure more similar to the lignin bound to xylan, i.e., having higher relative content of beta-O-4 ethers. It is hypothesized that xylan due to its carboxylic acids forms a locally lower pH and thus "direct" the lignin structure to have more beta-O-4 ethers. The biological significance of these results is discussed.
机译:木质素具有非常复杂的结构,部分原因是由于单体通过许多不同类型的共价键连接。此外,木质素和木材中的多糖之间存在多个共价键,并且已知与半纤维素木聚糖共价结合的木质素的结构与与半纤维素葡甘露聚糖结合的木质素不同。此处,合成木质素(DHP)是在不同pH下合成的,并且显示出在较低pH下制得的木质素具有与木聚糖结合的木质素更相似的结构,即,具有较高的β-O-4醚相对含量。据推测,木聚糖由于其羧酸而形成局部较低的pH,因此“指导”木质素结构以具有更多的β-O-4醚。讨论了这些结果的生物学意义。

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  • 来源
    《Wood Science and Technology》 |2017年第6期|1365-1376|共12页
  • 作者单位

    KTH Royal Inst Technol, WWSC, Chem & Chem Engn Sch, Teknikringen 56-58, S-10044 Stockholm, Sweden;

    Guangxi Univ, Light Ind & Food Engn Coll, 100 Daxue Rd, Nanning, Guangxi, Peoples R China;

    KTH Royal Inst Technol, WWSC, Chem & Chem Engn Sch, Teknikringen 56-58, S-10044 Stockholm, Sweden;

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