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Effects of Pretreatment with Acidic/Alkaline Deep Eutectic Solvents on Physical and Chemical Properties and Cellulose Enzymatic Hydrolysis of Balsa Wood
Received:March 21, 2024  
DOI：10.11980/j.issn.0254-508X.2024.06.001
Key Words:balsa wood  deep eutectic solvent  pretreatment  enzymatic hydrolysis  recycling
Fund Project:国家自然科学基金（32271804）。
Author NameAffiliationPostcode
TANG Yiquan Beijing Key Lab of Lignocellulosic Chemistry， Beijing Forestry University， Beijing， 100083 100083
RUI Anna Beijing Key Lab of Lignocellulosic Chemistry， Beijing Forestry University， Beijing， 100083 100083
YANG Jiyou Beijing Key Lab of Lignocellulosic Chemistry， Beijing Forestry University， Beijing， 100083 100083
SHANG Sainan Beijing Key Lab of Lignocellulosic Chemistry， Beijing Forestry University， Beijing， 100083 100083
SI Chuanling Tianjin Key Lab of Pulp and Paper， Tianjin University of Science & Technology， Tianjin， 300457 300457
BIAN Jing* Beijing Key Lab of Lignocellulosic Chemistry， Beijing Forestry University， Beijing， 100083 100083
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Abstract:Balsa wood was subjected to acidic/alkaline deep eutectic solvent （DES） pretreatment at 110 ℃ for 5 h， and the chemical composition， surface morphology， structural variation， and enzymatic hydrolysis performance of the balsa wood before and after pretreatment were analyzed. The results showed that all three types of acidic/alkaline DES pretreatments effectively deconstructed the balsa wood raw material. The acidic DES removed nearly all hemicelluloses and a portion of lignin， with the stronger acidic treatment using acidic aluminum chloride hexahydrate/propanetriol system resulting in partial cellulose degradation. The alkaline choline chloride/ethanolamine system pretreatment led to substantial removal of lignin while preserving a significant amount of carbohydrates in the residue. The pretreatment significantly enhanced cellulase hydrolysis， increasing the glucose yield from 16.5% in the raw material to 52.6%~60.7%. Even after being recycled three times， the cellulose hydrolysis rate of DES remained more than 2.5 times higher than that of the raw material.
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