A novel ternary deep eutectic solvent pretreatment for the efficient separation and conversion of high-quality gutta-percha, value-added lignin and monosaccharide from Eucommia ulmoides seed shells

• Published in: Bioresource technology 2023-02, Vol.370, p.128570-128570, Article 128570
• Main Authors: Duan, Cong-Jia, Han, Xu, Chang, Yuan-Hang, Xu, Jian, Yue, Gan-Lu, Zhang, Ying, Fu, Yu-Jie
• Format: Article
• Language: English
• Subjects: Biomass; Cellulose; Cellulose - chemistry; Deep Eutectic Solvents; Eucommia ulmoides seed shells; Eucommiaceae - chemistry; Gutta-Percha; Hydrolysis; Lignin; Lignin - chemistry; Monosaccharides; Seeds; Solvents - chemistry; Ternary deep eutectic solvent (DES)
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2022.128570

[Display omitted] •A ternary deep eutectic solvent was developed for Eucommia ulmoides seed shells.•About 79.7% hemicellulose and 65.6% lignin were quickly removed by DES pretreatment.•53.6% low-condensation lignin with valuable aryl-ether linkages was well obtained.•The yield and purity of DES-treated gutta-percha achieved 85.1 mg/g and 96.2 %.•The DES can remove 58.0% lignin and 73.9% hemicellulose after five cycles. A novel ternary deep eutectic solvent (DES), consisted of choline chloride, oxalic acid and ethylene glycol, was developed as a green, low-cost and recyclable pretreatment system for multi-stage utilization of Eucommia ulmoides seed shells. Under optimum conditions, 79.7 % hemicellulose and 65.6 % lignin were quickly removed while 84.0 % cellulose was retained. After DES pretreatment, the yield and purity of gutta-percha achieved 85.1 mg/g and 96.2 %, which increased 1.4 and 1.8 folds higher than that of un-treatment ones. Meanwhile, 69.1 % enzymatic digestibility of cellulose was obtained, that was 2.3 folds higher than that of raw substrates. Moreover, 53.6 % low-condensation lignin with aromatic structures and valuable aryl-ether linkages was well collected. Importantly, the DES that has been recycled five runs can still remove 73.9 % hemicellulose and 58.0 % lignin. Overall, the DES was determined to efficiently promote the separation and conversion of high-quality gutta-percha, value-added lignin and high-yield glucose from Eucommia ulmoides seed shells.