树皮中的木质素：化学结构和价值。,ChemSusChem

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树皮中的木质素：化学结构和价值。
ChemSusChem ( IF 7.5 ) Pub Date : 2020-05-12 , DOI: 10.1002/cssc.202000431
Duarte M Neiva _{1,

2} , Jorge Rencoret ₁ , Gisela Marques ₁ , Ana Gutiérrez ₁ , Jorge Gominho ₂ , Helena Pereira ₂ , José C Del Río ₁

Affiliation

来自不同树皮的木质素，包括挪威云杉（Picea abies）、桉树（Eucalyptus globulus）、含羞草（Acacia dealbata）和黑木金合欢（A. melanoxylon），均得到了彻底的表征。研究发现，蓝桉树皮中的木质素富含紫丁香基 (S) 单元，而愈创木基 (G) 和对羟基苯基 (H) 单元含量较低（H/G/S 比例为 1:26:73），它产生的木质素富含 β-醚键 (83%)，而来自两种金合欢树皮的木质素具有相似的成分（H/G/S 比例约为 5:50:45），其中 β- 醚键占主导地位。醚（73-75%）和较低量的稠合碳-碳键；来自A. dealbata树皮的木质素还包含一些与间苯二酚相关的化合物，这些化合物似乎与聚合物结合或密切相关。冷杉树皮中的木质素富含 G 单元，H 单元含量较低（H/G 比例为 14:86）；因此，这种木质素的 β-O-4' 烷基芳基醚键 (44%) 被耗尽，而缩合键则丰富。有趣的是，这种木质素含有大量的羟基二苯乙烯葡萄糖苷，它们似乎完整地融入木质素结构中。这项研究表明，树皮中的木质素可以被视为有价值的酚类化合物的有趣来源。此外，这项研究对于定制树皮解构和增值的转换技术很有用。

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Lignin from Tree Barks: Chemical Structure and Valorization.

Lignins from different tree barks, including Norway spruce (Picea abies), eucalyptus (Eucalyptus globulus), mimosa (Acacia dealbata) and blackwood acacia (A. melanoxylon), are thoroughly characterized. The lignin from E. globulus bark is found to be enriched in syringyl (S) units, with lower amounts of guaiacyl (G) and p‐hydroxyphenyl (H) units (H/G/S ratio of 1:26:73), which produces a lignin that is highly enriched in β‐ether linkages (83 %), whereas those from the two Acacia barks have similar compositions (H/G/S ratio of ≈5:50:45), with a predominance of β‐ethers (73–75 %) and lower amounts of condensed carbon–carbon linkages; the lignin from A. dealbata bark also includes some resorcinol‐related compounds, that appear to be incorporated or intimately associated to the polymer. The lignin from P. abies bark is enriched in G units, with lower amounts of H units (H/G ratio of 14:86); this lignin is thus depleted in β‐O‐4′ alkyl–aryl ether linkages (44 %) and enriched in condensed linkages. Interestingly, this lignin contains large amounts of hydroxystilbene glucosides that seem to be integrally incorporated into the lignin structure. This study indicates that lignins from tree barks can be seen as an interesting source of valuable phenolic compounds. Moreover, this study is useful for tailoring conversion technologies for bark deconstruction and valorization.

更新日期：2020-05-12

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