Efficient recovery and structural characterization of lignin from cotton stalk based on a biorefinery process using a γ-valerolactone/water system
| Autor: | Jia-Kun Liu, Run-Cang Sun, Miao Wu, Zhong-Ya Yan, Bo Wang, Xueming Zhang, Feng Xu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010405 organic chemistry
General Chemical Engineering 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Biorefinery 01 natural sciences 0104 chemical sciences Gel permeation chromatography chemistry.chemical_compound chemistry Stalk Lignin Organic chemistry Fourier transform infrared spectroscopy 0210 nano-technology Derivatization Two-dimensional nuclear magnetic resonance spectroscopy Heteronuclear single quantum coherence spectroscopy |
| Zdroj: | RSC Advances. 6:6196-6204 |
| ISSN: | 2046-2069 |
| Popis: | In order to understand the integrated reaction behavior for biomass pretreatment using the γ-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 anion-exchange 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 β-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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|