Article
Biochemistry & Molecular Biology
Shiyi Zeng, Qingzhi Ma, Shenchong Zhang, Conghao Shen, Jing Li, Huifang Zhao, Daliang Guo, Yan Zhang, Hui Yang
Summary: A characteristic Lignin-first strategy was developed through comprehensive investigation of the oxy-organosolv delignification processes under mild conditions. The results showed that the lignin yield could reach about 50% under the optimized process conditions. The use of oxygen induced significant lignin dissolution without affecting the carbohydrate component and lignin structure, resulting in uniform lignin degradation. Additionally, the employment of oxygen extended the lignin removal stage and increased the delignification rate compared to conventional methods.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Biotechnology & Applied Microbiology
Yulian Cao, Haifeng Liu, Junqiang Shan, Baijun Sun, Yanjun Chen, Lei Ji, Xingxiang Ji, Jian Wang, Chenjie Zhu, Hanjie Ying
Summary: In this study, wheat straw was fractionated into carbohydrates (cellulose and hemicellulose) by ammonia-mechanical pretreatment for l-lactic acid fermentation. The delignification rate was over 60% under optimal conditions. After enzymatic hydrolysis, the maximum conversions of cellulose and hemicellulose were 92.5% and 83.4% respectively, based on the pretreatment residue. The wheat straw hydrolysate was used to produce l-lactic acid with Thermoanaerobacter sp. DH-217G, achieving a yield of 88.6% and an optical purity of 99.2%. Ammonia-mechanical pretreatment is an economical method for producing fermentable monosaccharides, with potential for further downstream high-value applications.
FERMENTATION-BASEL
(2023)
Article
Agricultural Engineering
Helene Labauze, Nadja Cachet, Bouchra Benjelloun-Mlayah
Summary: Optimizing the pretreatment conditions for lignocellulosic biomass is crucial for obtaining high purity fractions, especially a lignin polymer that can be easily used for valuable applications. This study used wheat straw as a sample and pretreated it in organic acid-based organosolv medium at mild conditions. The chemical structure and kinetics of lignin were analyzed using various techniques, and the modifications during the organosolv pretreatment were quantified. The extraction kinetics of lignin were successfully assessed using a potential degree of delignification model.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Agricultural Engineering
Rui Lou, Xiao Zhang
Summary: The study showed that utilizing ChCl-LA based deep eutectic solvent for presoaking can effectively remove hemicellulose and facilitate lignin extraction. Different presoaking methods resulted in different morphological changes on fiber cell wall surface.
BIORESOURCE TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Hongzhi Ma, Penglu Fu, Jihua Zhao, Xingxing Lin, Wenyu Wu, Ziqiang Yu, Changlei Xia, Qunhui Wang, Ming Gao, Jun Zhou
Summary: In this study, a deep eutectic solvent (DES) system consisting of chlorine/lactic acid was used to pretreat wheat straw, and it was found that this pretreatment method effectively extracted lignin, retained cellulose, and removed hemicellulose. The best pretreatment condition was 150 degrees C for 6 hours, which resulted in the highest cellulose retention and an enzymatic digestibility of 89.98% for the pretreatment residue. Further characterization of lignin showed that the high yield and purity were attributed to the ether bond cleavage in lignin and the connection between hemicellulose and lignin. The study demonstrated the potential of DES pretreatment for efficient fractionation of lignocellulosic biomass into high-quality cellulose and lignin.
Article
Energy & Fuels
Muhammad Usman Khan, Birgitte Kiaer Ahring
Summary: The study found that wet explosion pretreatment can significantly increase lignin degradation and methane yield of wheat straw lignin, while untreated lignin performed poorly, further demonstrating the importance of pretreatment in enhancing anaerobic degradation of lignin.
Article
Agricultural Engineering
Wei Tang, Xinxing Wu, Caoxing Huang, Zhe Ling, Chenhuan Lai, Qiang Yong
Summary: Pretreatment with FeCl3 and AlCl3 can significantly increase enzymatic hydrolysis efficiency of waste wheat straw, mainly by increasing xylan removal. Additionally, metallic chlorides pretreatment can also reduce the surface charge, hydrophobicity, and protein adsorption capacity of lignin from waste wheat straw.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
P. Tsafrakidou, A. Moutsoglou, P. Prodromidis, T. Moschakis, A. Goula, C. G. Biliaderis, A. -M. Michaelidou
Summary: This study investigated the pretreatment of spent coffee grounds (SCG) with aqueous ammonia soaking (AAS) to enhance their enzymatic hydrolysis. The effects of treatment time, SCG solids loading, and temperature were examined. The pretreated SCG were then hydrolyzed with cellulases and hemicellulases, and the resulting hydrolysate was used as a carbon source for bacterial cellulose production. Compositional and morphological changes of the biomass materials were evaluated using spectroscopy and microscopy.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Article
Polymer Science
Aleksandr S. Kazachenko, Feride Akman, Natalya Yu Vasilieva, Yuriy N. Malyar, Olga Yu Fetisova, Maxim A. Lutoshkin, Yaroslava D. Berezhnaya, Angelina Miroshnikova, Noureddine Issaoui, Zhouyang Xiang
Summary: A method for modifying soda lignin with solid catalysts and sulfamic acid has been proposed and studied. The research showed that solid catalysts could cause hydrolysis reactions and reduce the molecular weight and polydispersity of lignin. The sulfated lignin exhibited thermal stability at high temperatures. These findings are important for the industrial processing of soda lignin.
Article
Agricultural Engineering
Na Pan, Baiheng Jiang, Jinguang Hu, Mei Huang, Jinsong He, Qin Jiang, Li Zhao, Fei Shen, Dong Tian
Summary: Mild hydrothermal pretreatment coupled with solvent extraction shows promise for enhancing lignin and carbohydrate output during lignocellulose fractionation. This study compared the coupling effect of mild hydrothermal pretreatment with acidic choline chloride-natural acid or alkaline choline hydroxide based deep eutectic solvents (DES) for wheat straw fractionation. The results showed that the alkaline DES achieved better lignin removal and swelling of lignocellulose, resulting in a cellulose-rich fraction with higher potential for further processing.
BIORESOURCE TECHNOLOGY
(2023)
Article
Materials Science, Paper & Wood
Florentyna Akus-Szylberg, Andrzej Antczak, Janusz Zawadzki
Summary: The effects of soaking aqueous ammonia pretreatment on fast-growing poplar wood for bioethanol production were studied. Results showed that higher temperature and ammonia concentration during pretreatment led to increased glucose content and reduced lignin content in the biomass, ultimately impacting sugar yield. Additionally, changes in polymerization degree and pore volume were investigated to further understand the impact of pretreatment conditions.
Article
Biochemistry & Molecular Biology
Shao-Fei Sun, Hai-Yan Yang, Jing Yang, Zheng-Jun Shi
Summary: The study proposed a method combining microwave-assisted hydrothermal pretreatment and alkaline post-treatment for separating lignin from poplar wood and revealing its structural characteristics. The integration increased the yield of lignins and decreased the sugar content, while promoting the cracking of beta-O-4 ethers in lignin macromolecules. This work is beneficial for improving lignin fractionation and efficient utilization in the biorefinery industry.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Agricultural Engineering
Liming Zhang, Anette Larsson, Annelie Moldin, Ulrica Edlund
Summary: Agricultural fiber sources like wheat straw show promise as renewable substitutes for synthetic materials. Interest in lignin utilization has increased, with a specific focus on lignin from wheat straw. However, the understanding of wheat lignin structure and composition is still limited. A comprehensive review of wheat lignin is essential for further utilization of wheat straw as a resource for bio-based materials.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Green & Sustainable Science & Technology
Asad Ayub Rajput, Zeshan, Muhammad Hassan
Summary: This research found that co-digestion and thermal pretreatment of wheat straw and sunflower meal can significantly increase biogas production. The optimal co-digestion mixture, when thermally treated at 180 degrees C, increased biogas yield by 94.3% compared to control.
Article
Green & Sustainable Science & Technology
Yuan Zhu, Benkun Qi, Xinquan Liang, Jianquan Luo, Yinhua Wan
Summary: This study investigated the efficient pretreatment of sugarcane bagasse using Lewis acid-mediated glycerol, leading to high glucan recovery, xylan removal, and delignification rates. Enzymatic saccharification of the pretreated bagasse resulted in a significant glucose yield, while the extracted lignin samples demonstrated contrasting effects on enzymatic hydrolysis, showing potential for valorization into high-value products.
