Catechyl Lignin Extracted from Castor Seed Coats Using Deep Eutectic Solvents: Characterization and Depolymerization,ACS Sustainable Chemistry & Engineering

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Catechyl Lignin Extracted from Castor Seed Coats Using Deep Eutectic Solvents: Characterization and Depolymerization
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-04-23 , DOI: 10.1021/acssuschemeng.0c00462
Shuizhong Wang ₁ , Shihao Su ₁ , Ling-Ping Xiao ₂ , Bo Wang ₁ , Run-Cang Sun ₂ , Guoyong Song ₁

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Catechyl lignin (C-lignin), a homobiopolymer usually existing in the seed coats of Vanilla and Cactaceae plants, was recognized as an “ideal lignin” archetype leading to well-defined aromatic compounds. Herein, we report that deep eutectic solvents (DESs) can serve as green and recyclable solvents to extract C-lignin from cheap and abundant castor seed coats for the first time, which led to C-lignin biopolymer in good yields with high purity. High abundance of benzodioxane structures in DES-extracted C-lignin samples was corroborated by HSQC NMR experiments. Catalytic depolymerization of ChCl/LA DES C-lignin with Pd/C resulted in monomeric catechol derivatives in 29.6 wt % (or 81 mol %) yields with 86% selectivity toward catechylpropanol. This study provided a green and cost-effective C-lignin extraction procedure from bulk sustainable feedstock, thus paving the way for C-lignin valorization into unique catechol compounds.

中文翻译：

深共晶溶剂从蓖麻籽皮中提取的儿茶素木质素：表征和解聚

儿茶素木质素（C-木质素），通常存在于香草和仙人掌科植物的种皮中的一种同质生物聚合物，被认为是“理想的木质素”原型，可产生定义明确的芳香族化合物。本文中，我们报道深共熔溶剂（DESs）可以作为绿色和可回收溶剂，首次从廉价且丰富的蓖麻种皮中提取C-木质素，这导致C-木质素生物聚合物的收率高，纯度高。通过HSQC NMR实验证实了DES提取的C-木质素样品中苯并二恶烷结构的丰度很高。ChCl / LA DES C-木质素与Pd / C的催化解聚反应产生29.6 wt％（或81 mol％）产率的单体邻苯二酚衍生物，对儿茶酚基丙醇的选择性为86％。这项研究提供了从批量可持续原料中提取绿色且经济高效的C-木质素的程序，

更新日期：2020-04-23

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