Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 18, Issue 11, Pages -Publisher
MDPI AG
DOI: 10.3390/ijms18112266
Keywords
deep eutectic solvents; DES-lignin; choline chloride; lactic acid
Funding
- National Key Research and Development Program of China [2017YFB0307900]
- National Natural Science Foundation of China [31400517, 31770626, 31770630]
- Taishan Scholars Program of Shandong Province
- Natural Science Foundation of Shaanxi Province [2016JM5008]
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Deep eutectic solvents (DESs) are a potentially high-value lignin extraction methodology. DESs prepared from choline chloride (ChCl) and three hydrogen-bond donors (HBD)lactic acid (Lac), glycerol, and ureawere evaluated for isolation of willow (Salix matsudana cv. Zhuliu) lignin. DESs types, mole ratio of ChCl to HBD, extraction temperature, and time on the fractionated DES-lignin yield demonstrated that the optimal DES-lignin yield (91.8 wt % based on the initial lignin in willow) with high purity of 94.5% can be reached at a ChCl-to-Lac molar ratio of 1:10, extraction temperature of 120 degrees C, and time of 12 h. Fourier transform infrared spectroscopy (FT-IR) , C-13-NMR, and P-31-NMR showed that willow lignin extracted by ChCl-Lac was mainly composed of syringyl and guaiacyl units. Serendipitously, a majority of the glucan in willow was preserved after ChCl-Lac treatment.
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