Study on Extracting Lignin from Oil-Tea Camellia Fruit Shells with Deep Eutectic Solvent and Its Structural Characteristics

MENG Meng; WU Minghui; ZHOU Haiyang; LYU Shihao; GAO Zhenzhong; SUN Jin

doi:10.12326/j.2096-9694.2024006

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Study on Extracting Lignin from Oil-Tea Camellia Fruit Shells with Deep Eutectic Solvent and Its Structural Characteristics
1.College of Materials and Energy of South China Agricultural University，Guangzhou 510642，Guangdong，China
2.Key Laboratory for Biobased Materials and Energy of Ministry of Education，Guangzhou 510642，Guangdong，China
Vol. 38, Issue 3, Pages: 64-71(2024)
DOI： 10.12326/j.2096-9694.2024006
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孟蒙,巫明惠,周海洋等.低共熔溶剂提取油茶果壳木质素及其结构特性研究[J].木材科学与技术,2024,38(03):64-71. DOI： 10.12326/j.2096-9694.2024006.

MENG Meng,WU Minghui,ZHOU Haiyang,et al.Study on Extracting Lignin from Oil-Tea Camellia Fruit Shells with Deep Eutectic Solvent and Its Structural Characteristics[J].Chinese Journal of Wood Science and Technology,2024,38(03):64-71. DOI： 10.12326/j.2096-9694.2024006.

摘要

为提高油茶果壳中木质素的利用价值，实现油茶加工废弃物的高值化利用，在优化工艺：油浴温度160 ℃、处理时间6 h、油茶果壳与低共熔溶剂（deep eutectic solvent，DES）固液质量比为1∶10、DES与H

O的质量比为10∶1的条件下，使用氯化胆碱-尿素（ChCl-U）、氯化胆碱-尿素-H

O（ChCl-U-H）、氯化胆碱-尿素-乙二胺（ChCl-U-E）、氯化胆碱-无水草酸（ChCl-OA）四种DES对废弃油茶果壳进行处理，研究不同DES对油茶果壳中木质素的提取效果，并对提取木质素的结构进行分析。结果显示：ChCl-U-E处理油茶果壳后木质素的提取率最高，达到84.40%；DES中氢键供体解离的质子（H

）能够促进木质素苯丙烷单元间不稳定醚键断裂

，形成小分子物质，引入酚羟基、甲氧基和羟甲基等；提取得到的木质素的分子量较小，空间位阻减小，活性增强；提取木质素主要是愈创木基苯丙烷单元，含有少量的对-羟苯基苯丙烷单元，且基本单元结构较为完整。本研究为木质素基酚醛树脂和其他芳香族化合物等的制备提供了理论依据。

Abstract

In order to enhance the value of lignin in oil-tea camellia fruit shells and achieve the high-value utilization of waste resources from Camellia processing. Under the conditions of optimizing the process: oil bath temperature of 160 ℃

treatment time of 6 hours

solid-liquid mass ratio of Camellia oleifera shell to deep eutectic solvent (DES) of 1∶10

and mass ratio of DES to H

O of 10∶1

four types of DES were used to treat abandoned Camellia oleifera shell

including choline chloride urea (ChCl-U)

choline chloride urea H

O (ChCl-U-H)

choline chloride urea ethylenediamine (ChCl-U-E)

and choline chloride anhydrous oxalic acid (ChCl-OA). The effects of DES on lignin in oil-tea camellia fruit shells were investigated. The extracted lignin structures were analyzed. The results showed that the extraction rate of lignin was the highest after ChCl-U-E treatment

reaching 84.40%. The proton (H

) dissociation from the hydrogen bond donor in DES promoted the cleavage of unstable ether bonds between lignin phenylpropane units

forming small molecular substances and introducing phenolic hydroxyl groups

methoxy groups

and hydroxymethyl groups. The extracted lignin has a lower molecular weight

reduced steric hindrance

and increased activity. The extracted lignin is mainly composed of guaiacyl propane units

with a small amount of p-hydroxyphenyl propane units. The basic unit structure is relatively intact. This study provides a theoretical basis for preparing lignin-based phenol-formaldehyde resins and other aromatic compounds.

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references

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