Journal
CHEMSUSCHEM
Volume 15, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202200553
Keywords
biomass; deep eutectic solvents; lignin; pretreatment; structural changes
Funding
- National Natural Science Foundation of China [31971613, 32071717]
- Beijing Forestry University Outstanding Young Talent Cultivation Project [2019JQ03005]
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This study reveals the migration and transformation mechanism of lignin during deep eutectic solvents (DESs) pretreatment. DES can penetrate from the cell lumen to the cell wall, and lignin in the secondary wall is more easily dissolved. The study also finds that DES has different stabilizing effects on different units of lignin.
Deep eutectic solvents (DESs) have unique advantages in biomass conversion. However, the migration and transformation mechanism of lignin in the cell wall during the DES pretreatment is still elusive. In this work, Eucalyptus blocks were pretreated in choline chloride/lactic acid DES to reveal the lignin migration. Meanwhile, the remaining lignin in the pretreated residue, the regenerated DES lignin, and the solubilized degraded lignin in the recovered DES were investigated to decipher the lignin transformation. Results showed that the DES pretreatment resulted in the penetration of DES from the cell lumen to the cell wall, and lignin in the secondary wall was more easily dissolved than that in the cell corner middle lamella. The syringyl unit of lignin was better stabilized in the DES than the guaiacyl unit of lignin. The condensed lignin fraction mainly remained in the pretreated residue, while the solubilized degraded lignin fraction was monomeric aromatic ketone compounds. This study elucidates the fate of lignin during the DES pretreatment, which could also promote the development of a modern lignocellulosic pretreatment technique.
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