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首页> 外文期刊>RSC Advances >Efficient recovery and structural characterization of lignin from cotton stalk based on a biorefinery process using a gamma-valerolactone/water system
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Efficient recovery and structural characterization of lignin from cotton stalk based on a biorefinery process using a gamma-valerolactone/water system

机译：基于γ-戊酮/水系统，基于生物料理过程的棉花秸秆中木质素的高效回收和结构表征

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摘要

In order to understand the integrated reaction behavior for biomass pretreatment using the gamma-valerolactone (GVL)/water system, the recovery and structural changes of the lignin components from cotton stalk obtained under different ratios of GVL to water were investigated. Structural elucidation of these lignin samples was performed by Fourier transform infrared spectroscopy (FT-IR), high-performance anionexchange chromatography (HPAEC), gel permeation chromatography (GPC), 2D heteronuclear single quantum coherence spectroscopy nuclear magnetic resonance (2D HSQC NMR), and derivatization followed by reductive cleavage (DFRC). The results showed that the separated lignin fractions possessed higher yields and purities than milled wood lignin (MWL). From the results of molecular weight, DFRC and 2D NMR analysis, it was also found that the lignin component from cotton stalk was a G-S type unit analogous to hardwood, and remarkable degradation and repolymerization occurred on lignin in this acid system, which led to more condensed and lower molecular weight lignin than MWL. Particularly, under the condition of GVL/H2O 80/20, the cleavages of aryl-ether bonds dramatically happened, resulting in the least amount of beta-O-4' linkages. Considering the concept of biorefinery, the one-pot acid GVL/H2O system with 80/20 GVL/H2O could be an attractive method for the simple and efficient recovery of lignin and sugars simultaneously from agricultural wastes.
机译：为了了解使用γ-戊酰胺（GV1）/水系统的生物量预处理的综合反应行为，研究了从GV1与水的不同比例下获得的棉花秸秆的木质素组分的回收和结构变化。通过傅里叶变换红外光谱（FT-IR）进行这些木质素样品的结构阐明，高性能HONONEXCHANGE色谱（HPAEC），凝胶渗透色谱（GPC），2D异核单量子相干光谱核磁共振（2D HSQC NMR），和衍生化，然后进行减少裂解（DFRC）。结果表明，分离的木质素级分具有比磨木木质素（MWL）更高的产率和纯度。从分子量，DFRC和2D NMR分析的结果中，也发现，来自棉茎的木质素组分是与硬木类似的GS型单位，并且在该酸系统中的木质素中发生了显着的降解和重新聚合，这导致了更多冷凝和低分子量木质素比mwl。特别地，在GV1 / H 2 80/20的条件下，芳基醚键的切割显着发生，导致β-O-4'键的含量最少。考虑到生物遗物的概念，具有80/20GVL / H2O的一锅酸GVL / H2O系统可以是从农业废物中同时简单有效地恢复木质素和糖的吸引力。

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  • 来源
    《RSC Advances》 |2016年第8期|共9页
  • 作者

    Wu Miao; Liu Jia-Kun; Yan Zhong-Ya; Wang Bo; Zhang Xue-Ming; Xu Feng; Sun Run-Cang;

  • 作者单位

    Beijing Forestry Univ Beijing Key Lab Lignocellulos Chem Beijing 100083 Peoples R China;

    Beijing Forestry Univ Beijing Key Lab Lignocellulos Chem Beijing 100083 Peoples R China;

    Beijing Forestry Univ Beijing Key Lab Lignocellulos Chem Beijing 100083 Peoples R China;

    Beijing Forestry Univ Beijing Key Lab Lignocellulos Chem Beijing 100083 Peoples R China;

    Beijing Forestry Univ Beijing Key Lab Lignocellulos Chem Beijing 100083 Peoples R China;

    Beijing Forestry Univ Beijing Key Lab Lignocellulos Chem Beijing 100083 Peoples R China;

    Beijing Forestry Univ Beijing Key Lab Lignocellulos Chem Beijing 100083 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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