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Article
Chemistry, Physical
Jiubin Zhu et al.
Summary: Different pretreatment methods, including lyophilization, hydrothermal pretreatment, and ultrasound combined with dilute alkali post-cooking, were investigated to enhance the efficiency of enzymatic saccharification and biohydrogen production of wheat straw. All methods effectively removed lignin and hemicellulose while retaining cellulose, improving biomass accessibility. Ultrasound combined with dilute alkali cooking produced a reducing sugar concentration of 13.18 g/L and a sequential fermentative hydrogen yield of 133.6 mL/g total solids.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Ran Zhang et al.
Summary: In this study, less recalcitrant cellulose nanofibril substrates were generated by site-specific mutations and knockouts of three essential OsCESA4,7,9 isoforms in rice. The genetically modified cellulose nanofibrils showed improved enzymatic hydrolysis for biofuel production and induced increased enzyme secretion from fungi. These findings demonstrate a novel and efficient strategy for high-quality bioproduction by genetically modifying lignocellulosic substrates.
Article
Agricultural Engineering
Dan Huo et al.
Summary: Optimization of deep eutectic solvents (DESs) with different acidity and alkalinity for biomass pretreatment was conducted. The combination of lactic acid/betaine hydrochloride showed the highest pretreatment efficiency, with removal rates of hemicellulose and lignin reaching 89% and 73% respectively, and enzymolysis efficiency as high as 92%. The introduction of chloride salts of different valence states into the DESs improved the pretreatment efficiency, particularly with AlCl3 showing superior performance and enzymolysis efficiency reaching 96% due to destruction of the crystalline region and esterification of partial cellulose. Thus, it is suggested that adding highly valent metal salts to acidic DESs enhances pretreatment and enzymatic efficiency.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Quanguo Zhang et al.
Summary: Ultrasonication assisted ionic liquid pretreatment was applied to enhance photo-fermentative biohydrogen production from Arundo donax L. biomass. The optimal conditions were found to be 16 g/L of 1-Butyl-3-methylimidazolium Hydrogen Sulfate ([Bmim]HSO4) combined with ultrasonication at a solid to liquid ratio (SLR) of 1:10 for 1.5 h under 60 °C. The maximum delignification achieved was 22.9%, and the hydrogen yield and energy conversion efficiency were increased by 1.5-fold and 46.4% (p < 0.05), respectively, compared to untreated biomass. Heat map analysis indicated that pretreatment temperature had the strongest correlation with hydrogen yield.
BIORESOURCE TECHNOLOGY
(2023)
Review
Engineering, Environmental
Monika Sharma et al.
Summary: Availability of biomass makes biofuel from bioresources more feasible. Recently, algal biomass and lignocellulosic biomass have been widely used in bioelectrochemical systems for bioelectricity and biohydrogen production. However, there is a lack of comprehensive reviews on this topic. This review provides an in-depth understanding of biomass-specific bioelectrochemical systems, including biomass selection, pretreatment approaches, dominating microbes, economic feasibility, and pilot-scale up.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Biotechnology & Applied Microbiology
Yunzi Hu et al.
Summary: Lignocellulosic biorefinery, as a potential strategy for sustainable production, faces challenges of low degradation efficiency and high enzyme dosage. This article provides a comprehensive review on this subject by discussing recent advances in substrate modification techniques, enzyme synergism mechanisms, and structure-activity interaction. Newly developed modeling and multi-omic analysis techniques for commercial enzyme preparations are introduced, offering possible avenues for achieving economic viability of lignocellulose bioconversion.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2023)
Review
Polymer Science
Jun Rao et al.
Summary: This review comprehensively elaborates the preparation of hemicellulose-based functional polymeric materials, such as nanoparticles, films and coatings, hydrogels and aerogels, carbon quantum dots, porous carbons, and catalysts. The review also provides an update on the latest progress in the application of hemicellulose-based functional materials in controlled-release, adsorption, biosensing, packaging, catalytic conversion, and electrode applications.
PROGRESS IN POLYMER SCIENCE
(2023)
Article
Multidisciplinary Sciences
Ran Zhang et al.
Summary: This study reveals the key characteristics of lignocellulose and proposes an engineering target to increase its saccharification ability. By investigating the assembly and conversion processes of cellulose nanofibers, it uncovers the digestibility and convertibility of plant cellulose substrates, providing a strategy for the development of cost-effective biofuels and high-quality bioproducts.
NATURE COMMUNICATIONS
(2023)
Article
Agricultural Engineering
Gunda Mohanakrishna et al.
Summary: Bioenergy production from lignocellulosic biomass (LCB) is an important topic for meeting energy demand, addressing climate change and waste management. Hydrothermal pretreatment is gaining popularity for organics recovery from LCB and can lead to the production of biohydrogen and biomethane. Integration approaches and utilization of solid residue obtained from LCB pretreatment were also discussed. The importance of hydrothermal pretreatment as a suitable strategy for LCB utilization and its future potential in large-scale energy recovery were emphasized.
BIORESOURCE TECHNOLOGY
(2023)
Review
Agricultural Engineering
Ran Zhang et al.
Summary: This study classified and evaluated all major types of biomass pretreatments recently conducted, exploring their different roles in wall polymer extraction and destruction for cost-effective biomass enzymatic saccharification and maximum biofuel production. Moreover, it proposed the conversion of undigestible lignocellulose residues into valuable bioproducts, such as nanomaterials, through desired pretreatments. As a result, this article presents a novel strategy for efficient lignocellulose utilization and zero-biomass-waste liberation, integrating cost-effective and green-like pretreatments with desirable lignocellulose substrates.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Laxmi Sharma et al.
Summary: Optimizing alkaline pretreatment and saccharification conditions can enhance saccharification yield of jute biomass. The highest delignification and saccharification were achieved with specific NaOH concentrations, temperature, and enzyme concentrations.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Jiyou Yang et al.
Summary: In this study, a mild fractionation method using polyol-based Bronsted acidic DESs (BDESs) was proposed to extract lignin and enhance fermentable sugar yields. More than 53% of lignin was obtained with excellent carbohydrate digestibility after pretreatment. The polyol was shown to stabilize reactive intermediates and prevent undesired reactions, contributing to enhanced enzymatic hydrolysis and lignin valorization. The resulting lignin fractions rich in ss-O-4 linkages were suitable for natural sunscreen applications. Overall, this work presents a sustainable and economically practical lignin-first biorefinery approach for lignocellulose valorization.
BIORESOURCE TECHNOLOGY
(2023)
Article
Energy & Fuels
Wenlu Song et al.
Summary: This study developed a choline chloride/1,4-butanediol deep eutectic solvent (DES) pretreatment aided with AlCl3/NaOH to dissociate the lignin macromolecular structure of corn straw and promote biohydrogen production. The alkali-catalyzed DES pretreatment achieved a higher yield of biohydrogen production compared to acid-catalyzed DES pretreatment. The enhanced biohydrogen production was attributed to the higher lignin removal rate of the alkali-catalyzed DES pretreatment, which facilitated enzymatic saccharification and dark fermentation of carbohydrate. The recovered lignin from this pretreatment exhibited well-preserved beta-O-4 ' linkages and regular spherical particles.
Article
Agricultural Engineering
Lu Liu et al.
Summary: The effect of mannitol was studied on the separation of poplar using mannitol-assisted oxalic acid pretreatment. The optimized conditions for separation efficiency were identified. Hemicellulose separation was achieved at 79.08%, while the separation of cellulose and lignin decreased. Smooth fiber surfaces and changes in lignin structure were observed, indicating lignin prevention. The environmentally friendly separation of hemicellulose provides a practical approach for resolving lignin problems during organic acid pretreatment.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Agricultural Engineering
Yayue Zheng et al.
Summary: This study investigated the effect of sulfuric acid-based phenoxyethanol pretreatment on the enzymatic digestibility of bamboo by examining the changes in lignin/xylan content and intercellular structures. The highest removal of lignin and xylan, achieved by pretreatment with a phenoxyethanol-acid ratio of 4:1 at 120 degrees C, resulted in pretreated bamboo with an enzymatic digestibility of 79.25%. Micro-computed tomography revealed that the macrostructure of bamboo cell wall was destroyed, exposing the macrofibers. Fluorescence microscopy showed the removal of lignin from the intercellular complex layer and a more severe destruction of the hemicellulose main chain during pretreatment. The structures of dissolved lignin in the pretreatment hydrolysate varied with the phenoxyethanol-acid ratio used.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Multidisciplinary Sciences
Guangxu Yang et al.
Summary: A method for preparing lignin-based wood adhesives from biomass has been developed, which can replace traditional synthetic adhesives. Plywood with superior performances can be produced using these adhesives, making them promising alternatives in various industries.
Article
Green & Sustainable Science & Technology
Shao-Chao Sun et al.
Summary: In this study, a green, efficient, and profitable pretreatment strategy using hydrothermal combined with alkaline deep eutectic solvents (HT-ADESs) was developed for the fractionation and valorization of bamboo biomass. The results showed that the strategy could selectively valorize hemicellulose into functional xylooligosaccharides (XOS) and facilitate subsequent delignification to achieve high glucose and xylose yields.
Review
Agricultural Engineering
Lei Zhao et al.
Summary: Bioenergy, as a clean and renewable energy source, shows great promise for replacing fossil fuels. Lignocellulose, with its potential for bioenergy production, can be effectively utilized through pretreatment technologies to enhance production efficiency.
BIORESOURCE TECHNOLOGY
(2022)
Review
Agricultural Engineering
Sumitha Banu Jamaldheen et al.
Summary: This review summarizes various physicochemical pretreatment methods for delignification and evaluates the advantages and disadvantages of each method. The article also discusses methods for overcoming lignin recalcitrance and recovering lignin, providing insights for sustainable lignocellulosic biorefinery.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Hong Chen et al.
Summary: The study found that biohydrogen production was higher in the thermophilic dark fermentation (TDF) compared to the mesophilic dark fermentation (MDF), with the highest yield at TS = 6%. The fermentation liquids in TDF had higher pH, NH4+-N, and total volatile fatty acids than those in MDF, indicating differences in microbial activity. Lactic acid-producing bacteria were found to be abundant at low TS content, while the highest biohydrogen production was associated with the highest abundance of hydrolytic bacteria at TS = 6%.
Article
Chemistry, Physical
Oznur Yildirim et al.
Summary: This study investigated the optimal pretreatment conditions for olive tree biomass (OTB) to produce bio-hydrogen. The results showed that high reducing sugar content and hydrogen yield can be achieved in OTB through pretreatment with sulfuric acid and oxalic acid, indicating its potential for bioenergy production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Biotechnology & Applied Microbiology
Shiva Zargar et al.
Summary: This study evaluates the environmental impacts of producing LCNCs from TMP with DES pretreatment, showing that varying the input volume and reuse frequency of DES solutions can reduce environmental impact, with the greatest reduction achieved by reducing the input volume to 20% of its default value.
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2022)
Article
Agricultural Engineering
Yameng Li et al.
Summary: The study found that torrefaction pretreatment could significantly enhance the enzymatic saccharification and hydrogen production efficiency of corn stover, with the best effects observed at 200 degrees Celsius.
BIORESOURCE TECHNOLOGY
(2022)
Review
Agricultural Engineering
Prangan Duarah et al.
Summary: This article focuses on the analysis of bioenergy policy measures undertaken by various federal agencies of different countries, aiming to shed light on the obstacles impeding the growth of biofuel as a sustainable and alternative fuel. It thoroughly reviews feedstock utilization, blending targets, and policy assistance schemes, and highlights the potential of commercial firms in bioenergy production. The article concludes with the authors' viewpoints to address the standing issues of global bioenergy generation.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Xiaoyan Yin et al.
Summary: In this study, an environmentally friendly co-solvent pretreatment method for the full utilization of moso bamboo was reported. It efficiently converted lignocellulosic biomass into platform chemicals, providing a sustainable approach for bio-refinery.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Biochemistry & Molecular Biology
Baojie Liu et al.
Summary: Organic acid pretreatment, as a clean and efficient method for lignocellulosic biomass separation, selectively isolates hemicellulose or lignin while preserving the cellulose structure. This study summarizes the separation characteristics of hemicellulose or lignin using different organic acids and analyzes the challenges and prospects of organic acid pretreatment.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Review
Agricultural Engineering
Dongle Cheng et al.
Summary: This review discusses advanced technologies that have shown positive outcomes in improving photo-fermentative biohydrogen production, including genetic engineering, immobilization technology, nanotechnology, and integration of dark and photo fermentation technology.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Ali Mohammad Rahmani et al.
Summary: Agro-waste, particularly wheat straw, is an effective material for energy recovery through anaerobic digestion. However, the complex lignocellulosic structure hinders their conversion and is a limiting factor in the AD process. Physical and chemical pretreatments can overcome these barriers, with ionic liquids emerging as a renewable and efficient option. Bacterial pretreatment is superior to fungal and algal pretreatments for biological pretreatment.
Article
Agricultural Engineering
Marco Buffi et al.
Summary: The paper highlights the importance of hydrogen as a key component of the European decarbonisation strategy and emphasizes the potential of hydrogen from biomass sources in the integration of renewable hydrogen supply. It reviews several production pathways and evaluates the most promising technologies for commercialization. While some pathways are still at a low technology readiness level, others are ready for immediate market uptake.
BIOMASS & BIOENERGY
(2022)
Article
Agricultural Engineering
Xue Chen et al.
Summary: By pretreating corn straw with Lewis acid enhanced deep eutectic solvent (DES) using choline chloride/glycerol, both the enzymatic hydrolysis efficiency and biohydrogen production were significantly improved. This enhancement can be attributed to the effective removal of lignin and hemicellulose, which increased the bio-accessibility of the straw.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Guilong Yan et al.
Summary: This study investigates the pretreatment of corncob using a deep eutectic solvent (DES) and evaluates three different recycling procedures. The results show that adding oxalic acid and removing lignin are key factors affecting the efficiency of DES reuse. After ten cycles of recycling, the pretreatment efficiency of the recycled DES does not significantly decrease compared to the original DES pretreatment, and the content of fermentation inhibitors in the enzymatic hydrolysates is not significantly increased.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Engineering, Environmental
Cheng-Ye Ma et al.
Summary: In this study, a tailored one-pot lignocellulose fractionation method was developed using ultrafast and recyclable microwave-assisted ternary deep eutectic solvent (DES) pretreatment. This method significantly reduced the recalcitrance of natural biomass, promoted the enzymatic saccharification of cellulose, and produced lignin nanoparticles. The delignification process during DES pretreatment was visually monitored. The glucose yield of the pretreated poplar reached 95.4%, which was 5.8 times higher than the control. The regenerated DES lignin exhibited nanosized lignin with controllable size and excellent antioxidant activity.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Chemistry, Physical
Yang Chen et al.
Summary: Dark fermentative hydrogen production is an effective and feasible technology, but not commercially applied yet due to inhibitory factors limiting hydrogen production potential. This review systematically analyzed various inhibitory factors, including inorganic, organic, and bio-inhibitors, discussing strategies for mitigation and suggesting future research directions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Agricultural Engineering
Jungang Jiang et al.
Summary: This study demonstrated the high-yield production of lignin-containing cellulose nanocrystals from thermomechanical pulp using recyclable oxalic acid dihydrate. The use of this method showed potential for reducing global warming potential and energy use through recycling of the reactant.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Green & Sustainable Science & Technology
Youmei Wang et al.
Summary: This review introduces a novel approach to address biomass recalcitrance issues: generating cellulose nanofibers with reduced recalcitrance through site-specific gene editing, achieving complete enzymatic saccharification by engineering fungal strains, utilizing engineered yeast strains for efficient co-fermentation to produce bioethanol, and finally generating biomaterials and biochemicals through green processing technology.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Engineering, Environmental
Jinghua Wang et al.
Summary: The study systematically investigated the conversion of glucose to HMF and LA in LiCl·3H2O without additional catalysts. High temperature favors LA formation, while low temperature facilitates Humin formation. The addition of Lewis acids can increase the yield of LA.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Hao-Lin Wei et al.
Summary: This study developed a promising biorefinery technology for herb residues using IL and TsOH pretreatment, achieving high cellulose recovery yield, lignin removal rate, and saccharification yield under optimal conditions. The recycled IL maintained high saccharification yields and lignin recovery, with hemicellulose-derived saccharides being the main impurities detected.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Jie Bu et al.
Summary: The study explored the benefits of biochar in dark fermentative hydrogen production, which increased biohydrogen production by stimulating bacterial growth, improving enzymatic activities, manipulating NADH/NAD+ ratio, and enhancing electron transfer efficiency. Biochar enrichment of cellulolytic Lachnospiraceae and electroactive bacteria formation on its surface suggested a synergistic effect between functional bacteria and extracellular electron transfer for enhanced performance in biohydrogen production.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2014)
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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Jae-Won Lee et al.
BIORESOURCE TECHNOLOGY
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