Deep Eutectic Solvents (DESs) for the Isolation of Willow Lignin (Salix matsudana cv. Zhuliu)

International Journal of Molecular Sciences

Rui Lou¹  Guihua Yang²  Haroon A. M. Saeed²  Jiachuan Chen²  Tengfei Li²  Lucian A. Lucia²  Yu Liu²  Gaojin Lyu² 

[1] College of Mechanical and Electronic Engineering, Shaanxi University of Science and Technology, Xi’an 710021, Shaanxi, China;Key Lab of Pulp and Paper Science and Technology of the Ministry of Education, Qilu University of Technology, Jinan 250353, Shandong, China;

关键词: deep eutectic solvents;    DES-lignin;    choline chloride;    lactic acid;   

DOI  :  10.3390/ijms18112266

来源: DOAJ

【 摘 要 】

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 urea—were 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 °C, and time of 12 h. Fourier transform infrared spectroscopy (FT-IR) , 13C-NMR, and 31P-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.

【 授权许可】

Unknown