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Ran X, Gao Y, He X, Wang Z, Mo Y, Li Y. Enhanced glucose-1-phosphate production from corn stover using cellulases with reduced β-glucosidase activity via Trbgl1 gene knockout in Trichoderma reesei Rut C30. Enzyme Microb Technol 2024; 180:110503. [PMID: 39208708 DOI: 10.1016/j.enzmictec.2024.110503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 07/30/2024] [Accepted: 08/20/2024] [Indexed: 09/04/2024]
Abstract
The scarcity of cellulases with low β-glucosidase activity poses a significant technological challenge in precisely controlling the partial hydrolysis of lignocellulose to cellobiose, crucial for producing high-value chemicals such as starch, inositol, and NMN. Trichoderma reesei is a primary strain in cellulase production. Therefore, this study targeted the critical β-glucosidase gene, Trbgl1, resulting in over an 86 % reduction in β-glucosidase activity. However, cellulase production decreased by 19.2 % and 20.3 % with lactose or cellulose inducers, respectively. Notably, transcript levels of cellulase genes and overall yield remained unaffected with an inducer containing sophorose. This indicates that β-glucosidase BGL1 converts lactose or cellulose to sophorose through transglycosylation activity, inducing cellulase gene transcription. The resulting enzyme cocktail, comprising recombinant cellulase and cellobiose phosphorylase, was applied for corn stover hydrolysis, resulting in a 24.3 % increase in glucose-1-phosphate yield. These findings provide valuable insights into obtaining enzymes suitable for the high-value utilization of lignocellulose.
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Affiliation(s)
- Xiaoqin Ran
- School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
| | - Yushan Gao
- School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
| | - Xiao He
- School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
| | - Zancheng Wang
- School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
| | - Yi Mo
- School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
| | - Yonghao Li
- School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
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2
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Vega-Hernández MÁ, Munguía-Quintero MF, Rosas-Aburto A, Alcaraz-Cienfuegos J, Valdivia-López MDLÁ, Hernández-Luna MG, Vivaldo-Lima E. Effect of teak wood lignocellulose pretreatment on the performance of cellulose-graft-(net-poly(acrylamide-co-acrylic acid)) for water absorption and dye removal. Int J Biol Macromol 2024; 274:133482. [PMID: 38942409 DOI: 10.1016/j.ijbiomac.2024.133482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Revised: 06/05/2024] [Accepted: 06/25/2024] [Indexed: 06/30/2024]
Abstract
Cellulose modified hydrogels can be produced directly from raw biopolymers in novel cellulose solvents such as NaOH/urea aqueous solution. The effect of cellulose characteristics on the synthesis of a cellulose-graft-(net-poly(acrylamide-co-acrylic acid)) and its performance as water absorbent/methylene blue dye removal material is analyzed. Three cellulose samples, one analytical grade and two obtained from teak wood sawdust with different pretreatments (one alkaline and the other, a novel one known as (gas phase) acid pretreatment) were compared. The starting raw celluloses were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and viscosity in cupri ethylenediamine hydroxide (CED) solution, whereas the chemically modified materials were characterized by SEM, FTIR, and TGA. The pretreatment used influences composition, crystallinity index and degree of polymerization (DP) of the cellulose obtained. The modified material produced with cellulose from alkaline pretreatment showed the highest swelling ratio in water absorption tests at room temperature (12,714 %); in contrast, the one with cellulose from acid pretreatment showed the lowest swelling ratio (7,470 %). However, this difference is not so significative in dye removal tests, where absorption capacity is 139 and 140 mg/g, respectively. The results indicate that cellulose composition, particularly structures with significant hemicellulose and lignin remaining content, has a major effect on the performance of modified materials for water absorption, and degree of polymerization has a major effect on adsorption capacity of methylene blue.
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Affiliation(s)
- Miguel Ángel Vega-Hernández
- Facultad de Química (FQ), Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Ciudad de México 04510, Mexico
| | - María Fernanda Munguía-Quintero
- Facultad de Química (FQ), Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Ciudad de México 04510, Mexico
| | - Alberto Rosas-Aburto
- Facultad de Química (FQ), Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Ciudad de México 04510, Mexico
| | - Jorge Alcaraz-Cienfuegos
- Facultad de Química (FQ), Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Ciudad de México 04510, Mexico
| | - María de Los Ángeles Valdivia-López
- Facultad de Química, Departamento de Alimentos y Biotecnología, Universidad Nacional Autónoma de México (UNAM), Ciudad de México 04510, Mexico
| | - Martín G Hernández-Luna
- Facultad de Química (FQ), Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Ciudad de México 04510, Mexico
| | - Eduardo Vivaldo-Lima
- Facultad de Química (FQ), Departamento de Ingeniería Química, Universidad Nacional Autónoma de México (UNAM), Ciudad de México 04510, Mexico.
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Wang Y, Cai D, Jiang Y, Mei X, Ren W, Sun M, Su C, Cao H, Zhang C, Qin P. Rapid fractionation of corn stover by microwave-assisted protic ionic liquid [TEA][HSO 4] for fermentative acetone-butanol-ethanol production. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2024; 17:62. [PMID: 38715100 PMCID: PMC11077788 DOI: 10.1186/s13068-024-02499-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Accepted: 04/02/2024] [Indexed: 05/12/2024]
Abstract
BACKGROUND The use of ionic liquids (ILs) to fractionate lignocelluloses for various bio-based chemicals productions is in the ascendant. On this basis, the protic ILs consisting of triethylammonium hydrogen sulfate ([TEA][HSO4]) possessed great promise due to the low price, low pollution, and high efficiency. In this study, the microwave-assistant [TEA][HSO4] fractionation process was established for corn stover fractionation, so as to facilitate the monomeric sugars production and supported the downstream acetone-butanol-ethanol (ABE) fermentation. RESULTS The assistance of microwave irradiation could obviously shorten the fractionation period of corn stover. Under the optimized condition (190 W for 3 min), high xylan removal (93.17 ± 0.63%) and delignification rate (72.90 ± 0.81%) were realized. The mechanisms for the promotion effect of the microwave to the protic ILs fractionation process were ascribed to the synergistic effect of the IL and microwaves to the depolymerization of lignocellulose through the ionic conduction, which can be clarified by the characterization of the pulps and the isolated lignin specimens. Downstream valorization of the fractionated pulps into ABE productions was also investigated. The [TEA][HSO4] free corn stover hydrolysate was capable of producing 12.58 g L-1 of ABE from overall 38.20 g L-1 of monomeric sugars without detoxification and additional nutrients supplementation. CONCLUSIONS The assistance of microwave irradiation could significantly promote the corn stover fractionation by [TEA][HSO4]. Mass balance indicated that 8.1 g of ABE and 16.61 g of technical lignin can be generated from 100 g of raw corn stover based on the novel fractionation strategy.
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Affiliation(s)
- Yankun Wang
- National Energy R&D Center for Biorefinery, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Di Cai
- National Energy R&D Center for Biorefinery, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Yongjie Jiang
- National Energy R&D Center for Biorefinery, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Xueying Mei
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Wenqiang Ren
- Research Center for Eco-Environmental Sciences, Chinese Academy of Science, Beijing, 100085, China
| | - Mingyuan Sun
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Changsheng Su
- National Energy R&D Center for Biorefinery, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Hui Cao
- National Energy R&D Center for Biorefinery, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China
| | - Changwei Zhang
- National Energy R&D Center for Biorefinery, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China.
| | - Peiyong Qin
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China.
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Tan R, Sun Q, Yan Y, Chen T, Wang Y, Li J, Guo X, Fan Z, Zhang Y, Chen L, Wu G, Wu N. Co-production of pigment and high value-added bacterial nanocellulose from Suaeda salsa biomass with improved efficiency of enzymatic saccharification and fermentation. Front Bioeng Biotechnol 2023; 11:1307674. [PMID: 38098970 PMCID: PMC10720727 DOI: 10.3389/fbioe.2023.1307674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 11/21/2023] [Indexed: 12/17/2023] Open
Abstract
This study evaluated the co-production of pigment and bacterial nanocellulose (BNC) from S. salsa biomass. The extraction of the beet red pigment reduced the salts and flavonoids contents by 82.7%-100%, promoting the efficiencies of enzymatic saccharification of the biomass and the fermentation of BNC from the hydrolysate. SEM analysis revealed that the extraction process disrupted the lignocellulosic fiber structure, and the chemical analysis revealed the lessened cellulase inhibitors, consequently facilitating enzymatic saccharification for 10.4 times. BNC producing strains were found to be hyper-sensitive to NaCl stress, produced up to 400.4% more BNC from the hydrolysate after the extraction. The fermentation results of BNC indicated that the LDU-A strain yielded 2.116 g/L and 0.539 g/L in ES-M and NES-M, respectively. In comparison to the control, the yield in ES-M increased by approximately 20.0%, while the enhancement in NES-M was more significant, reaching 292.6%. After conducting a comprehensive characterization of BNC derived from S. salsa through Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Thermogravimetric Analysis (TGA), the average fiber diameter distribution of these four BNC materials ranges from 22.23 to 33.03 nanometers, with a crystallinity range of 77%-90%. Additionally, they exhibit a consistent trend during the thermal degradation process, further emphasizing their stability in high-temperature environments and similar thermal properties. Our study found an efficient co-production approach of pigment and BNC from S. salsa biomass. Pigment extraction made biomass more physically and chemically digestible to cellulase, and significantly improved BNC productivity and quality.
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Affiliation(s)
- Ran Tan
- Shandong Key Laboratory of Edible Mushroom Technology, School of Agriculture, Ludong University, Yantai, China
| | - Qiwei Sun
- Shandong Key Laboratory of Edible Mushroom Technology, School of Agriculture, Ludong University, Yantai, China
| | - Yiran Yan
- Shandong Key Laboratory of Edible Mushroom Technology, School of Agriculture, Ludong University, Yantai, China
| | - Tao Chen
- Shandong Key Laboratory of Edible Mushroom Technology, School of Agriculture, Ludong University, Yantai, China
| | - Yifei Wang
- Shandong Key Laboratory of Edible Mushroom Technology, School of Agriculture, Ludong University, Yantai, China
| | - Jiakun Li
- Shandong Key Laboratory of Edible Mushroom Technology, School of Agriculture, Ludong University, Yantai, China
| | - Xiaohong Guo
- School of Resources and Environmental Engineering, Ludong University, Yantai, China
| | - Zuoqing Fan
- Shandong Institute of Sericulture, Yantai, China
| | - Yao Zhang
- School of Chemistry and Materials Science, Ludong University, Yantai, China
| | - Linxu Chen
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Guochao Wu
- Shandong Key Laboratory of Edible Mushroom Technology, School of Agriculture, Ludong University, Yantai, China
- Key Laboratory of Molecular Module-Based Breeding of High Yield and Abiotic Resistant Plants in Universities of Shandong, School of Agriculture, Ludong University, Yantai, China
| | - Nan Wu
- School of Resources and Environmental Engineering, Ludong University, Yantai, China
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Two-Stage Pretreatment of Jerusalem Artichoke Stalks with Wastewater Recycling and Lignin Recovery for the Biorefinery of Lignocellulosic Biomass. Processes (Basel) 2023. [DOI: 10.3390/pr11010127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Jerusalem artichoke (Helianthus tuberosus L.) is emerging as one of the energy plants considered for biofuel production. Alkali and alkali-involved pretreatment methods have been widely used for the bioconversion of cellulosic materials due to their high sugar yield and low inhibitor release. However, the recovery and treatment of wastewater (black liquor) have been poorly studied. Here, we present a novel two-stage pretreatment process design for recycling black liquor. Jerusalem artichoke stalk (JAS) was first treated with 2% (w/v) NaOH, after which lignin was recovered by H2SO4 at pH 2.0 from the black liquor. The recycled solutions were subsequently used to treat the NaOH-pretreated JAS for the second time to dissolve hemicellulose. CO-pretreated JAS, hydrolysates, and acid-insoluble lignin were obtained after the above-mentioned two-stage pretreatment. A reducing sugar yield of 809.98 mg/g Co-pretreated JAS was achieved after 48 h at 5% substrate concentration using a cellulase dosage of 25 FPU/g substrate. In addition, hydrolysates containing xylose and acid-insoluble lignin were obtained as byproducts. The pretreatment strategy described here using alkali and acid combined with wastewater recycling provides an alternative approach for cellulosic biorefinery.
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Capetti CCDM, Pellegrini VOA, Espirito Santo MC, Cortez AA, Falvo M, Curvelo AADS, Campos E, Filgueiras JG, Guimaraes FEG, de Azevedo ER, Polikarpov I. Enzymatic production of xylooligosaccharides from corn cobs: Assessment of two different pretreatment strategies. Carbohydr Polym 2023; 299:120174. [PMID: 36876789 DOI: 10.1016/j.carbpol.2022.120174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Revised: 09/23/2022] [Accepted: 09/26/2022] [Indexed: 10/14/2022]
Abstract
Corn cobs (CCs) are abundant xylan-rich agricultural wastes. Here, we compared CCs XOS yields obtained via two different pretreatment routs, alkali and hydrothermal, using a set of recombinant endo- and exo-acting enzymes from GH10 and GH11 families, which have different restrictions for xylan substitutions. Furthermore, impacts of the pretreatments on chemical composition and physical structure of the CCs samples were evaluated. We demonstrated that alkali pretreatment route rendered 59 mg of XOS per gram of initial biomass, while an overall XOS yield of 115 mg/g was achieved via hydrothermal pretreatment using a combination of GH10 and GH11 enzymes. These results hold a promise of ecologically sustainable enzymatic valorization of CCs via "green" and sustainable XOS production.
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Affiliation(s)
- Caio Cesar de Mello Capetti
- Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, 13566-590 São Carlos, SP, Brazil
| | | | - Melissa Cristina Espirito Santo
- Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, 13566-590 São Carlos, SP, Brazil
| | - Anelyse Abreu Cortez
- Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, 13566-590 São Carlos, SP, Brazil
| | - Maurício Falvo
- Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, 13566-590 São Carlos, SP, Brazil
| | - Antonio Aprigio da Silva Curvelo
- Instituto de Química de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, 13566-590 São Carlos, SP, Brazil
| | - Eleonora Campos
- Instituto de Biotecnología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Los Reseros y N. Repetto, Hurlingham B1686, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina
| | - Jefferson Gonçalves Filgueiras
- Instituto de Química, Universidade Federal Fluminense, Outeiro de São João Batista, 24020-007, Niterói, RJ, Brazil; Instituto de Física, Universidade Federal do Rio de Janeiro, CP68528, 21941-972, Rio de Janeiro, RJ, Brazil
| | | | - Eduardo Ribeiro de Azevedo
- Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, 13566-590 São Carlos, SP, Brazil
| | - Igor Polikarpov
- Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São-carlense 400, 13566-590 São Carlos, SP, Brazil.
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Naitam MG, Tomar GS, Kaushik R. Optimization and production of holocellulosic enzyme cocktail from fungi Aspergillus nidulans under solid-state fermentation for the production of poly(3-hydroxybutyrate). Fungal Biol Biotechnol 2022; 9:17. [PMID: 36527155 PMCID: PMC9758824 DOI: 10.1186/s40694-022-00147-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 11/19/2022] [Indexed: 12/23/2022] Open
Abstract
The production of petroleum-based plastics increased dramatically following industrialization. Because of multifaceted properties such as durability, thermostability, water resistance, and many others, these plastics have become an indispensable part of daily life. However, while improving people's quality of life, indiscriminate use of plastics has caused pollution and raised environmental concerns. To address this situation and reduce environmental risks, microbially produced biopolymers such as poly-3-hydroxyalkanoates can be used to make bioplastics that are completely biodegradable under normal environmental conditions. At the moment, the cost of bioplastic production is high when compared to petroleum-based plastics, so alternate strategies for making the bioplastic process economical are urgently needed. Agricultural waste is abundant around the world and can be efficiently used as a low-cost renewable feedstock after pretreatment and enzymatic hydrolysis. Fungi are well known as primary degraders of lignocellulosic waste, and this property was used in the current study to enzymatically hydrolyze the pretreated paddy straw for the production of reducing sugars, which were then used in the microbial fermentation for the production of PHB. In this study, Aspergillus nidulans was used to advance a low-cost and efficient enzyme hydrolysis system for the generation of reducing sugars from lignocellulosic biomass. For the production of the holocellulosic enzyme complex, the fungus was grown on wheat straw with Reese mineral medium as a wetting agent. After 216 h of solid-state fermentation at 30 °C, pH 6.0, the enzyme extract from A. nidulans demonstrated the highest activity, CMCase 68.58 (± 0.55), FPase 12.0 (± 0.06), Xylanase 27.17 (± 0.83), and β-glucosidase 1.89 (± 0.037). The initial pH, incubation temperature, and time all had a significant impact on final enzyme activity. Enzymatic hydrolysis of pretreated paddy straw produced reducing sugars (8.484 to 30.91 gL-1) that were then used to produce poly(3-hydroxybutyrate) using halophilic bacterial isolates. Burkholderia gladioli 2S4R1 and Bacillus cereus LB7 accumulated 26.80% and 20.47% PHB of the cell dry weight, respectively. This suggests that the holocellulosic enzyme cocktail could play a role in the enzymatic hydrolysis of lignocellulosic materials and the production of PHA from less expensive feedstocks such as agricultural waste.
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Affiliation(s)
- Mayur G. Naitam
- grid.418196.30000 0001 2172 0814Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Govind Singh Tomar
- grid.418196.30000 0001 2172 0814Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Rajeev Kaushik
- grid.418196.30000 0001 2172 0814Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012 India
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Qiao J, Cui H, Wang M, Fu X, Wang X, Li X, Huang H. Integrated biorefinery approaches for the industrialization of cellulosic ethanol fuel. BIORESOURCE TECHNOLOGY 2022; 360:127516. [PMID: 35764282 DOI: 10.1016/j.biortech.2022.127516] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/20/2022] [Accepted: 06/22/2022] [Indexed: 06/15/2023]
Abstract
Lignocellulosic biomass is an abundant and sustainable raw material, but its conversion into ethanol fuel has not yet achieved large-scale industrialization and economic benefits. Integrated biorefineries have been widely identified as the key to achieving this goal. Here, four promising routes were summarized to assemble the new industrial plants for cellulose-based fuels and chemicals, including 1) integration of cellulase production systems into current cellulosic ethanol processes; 2) combination of processes and facilities between cellulosic ethanol and first-generation ethanol; 3) application of enzyme-free saccharification processes and computational approaches to increase the bioethanol yield and optimize the integration process; 4) production of multiple products to maximize the value derived from the lignocellulosic biomass. Finally, the remaining challenges and perspectives of this field are also discussed.
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Affiliation(s)
- Jie Qiao
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, No. 2 Xuelin Road, Nanjing 210097, China
| | - Haiyang Cui
- Institute of Biotechnology, RWTH Aachen University, Worringerweg 3, 52074 Aachen, Germany
| | - Minghui Wang
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, No. 2 Xuelin Road, Nanjing 210097, China
| | - Xianshen Fu
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, No. 2 Xuelin Road, Nanjing 210097, China
| | - Xinyue Wang
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, No. 2 Xuelin Road, Nanjing 210097, China
| | - Xiujuan Li
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, No. 2 Xuelin Road, Nanjing 210097, China.
| | - He Huang
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, No. 2 Xuelin Road, Nanjing 210097, China; School of Pharmaceutical Sciences, Nanjing Tech University, No. 30 South Puzhu Road, Nanjing 211816, China
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9
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Shinda CA, Nthakanio PN, Gitari JN, Runo S, Mukono S, Maina S. Nutrient content of sorghum hybrid lines between Gadam and hard coat tannin sorghum cultivars. Food Sci Nutr 2022; 10:2202-2212. [PMID: 35844921 PMCID: PMC9281938 DOI: 10.1002/fsn3.2830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 02/28/2022] [Accepted: 02/28/2022] [Indexed: 11/09/2022] Open
Abstract
Sorghum is an important food crop in the world that exhibits a predominant role in fulfilling the nutritional requirements, particularly in low-income group populations of marginal areas in Kenya. It is a principal source of proteins, carbohydrates, fats, and crude fibers (CFs), which are important nutrients necessary for human development and health. Reduced tannin in sorghum grains is desirable since it affects the availability of nutrients. This study aimed at assessing the nutrient content in filial generation one (F1) developed between Gadam (sorghum), which is low in tannin and hard coat tannin (sorghum) cultivars. The nutrient content analyses were carried out from samples collected in a completely randomized design experiment. Crude protein (CP) and tannin content were analyzed using the modified Kjeldahl method and vanillin-HCl methanol method, respectively, whereas moisture, fat, CF, ash, and carbohydrate contents were determined using Association of Official Analytical Chemists methods. Data collected were subjected to analysis of variance using R statistical software. Among the F1s, Kari/Mtama-1 x Gadam recorded the highest CP value of 10.390%. This differed significantly from Gadam x Kari/Mtama-1 which recorded CP content of 9.770%. Kari/Mtama-1 x Gadam recorded the highest fat and moisture contents of 2.299% and 8.600%, respectively. The highest CF content of 3.433% was recorded in Gadam x Serena. Gadam x Kari/Mtama-1 recorded the highest ash content of 1.619%, whereas the highest carbohydrate (84.503%) and tannin content (0.771 mg/g) means were recorded in Seredo x Gadam. Results demonstrated that the choice of maternal and paternal parent influence CP, CF, and carbohydrate contents. Among the F1s, tannin content ranged from 0.106 to 0.771 mg/g compared to 0.953 to 1.763 mg/g recorded in Serena and Seredo (hard coat seeded cultivars). This is an indication that tannin can be downregulated through hybridization.
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Affiliation(s)
- Cecilia A. Shinda
- Department of Water and Agricultural Resource ManagementUniversity of EmbuEmbuKenya
| | - Paul N. Nthakanio
- Department of Water and Agricultural Resource ManagementUniversity of EmbuEmbuKenya
| | - Josiah N. Gitari
- Department of Water and Agricultural Resource ManagementUniversity of EmbuEmbuKenya
| | - Steven Runo
- Department of Biochemistry, Microbiology and BiotechnologyKenyatta UniversityNairobiKenya
| | - Simon Mukono
- Department of Physical SciencesUniversity of EmbuEmbuKenya
| | - Samuel Maina
- Department of Biological SciencesUniversity of EmbuEmbuKenya
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Jing X, Chai X, Long S, Liu T, Si M, Zheng X, Cai X. Urea/sodium hydroxide pretreatments enhance decomposition of maize straw in soils and sorption of straw residues toward herbicides. JOURNAL OF HAZARDOUS MATERIALS 2022; 431:128467. [PMID: 35220122 DOI: 10.1016/j.jhazmat.2022.128467] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 01/27/2022] [Accepted: 02/08/2022] [Indexed: 06/14/2023]
Abstract
Because of the rigid crystalline structure and recalcitrant components, maize straw returned is slowly decomposed in soils. Straw residues are substantially accumulated in soils and pose detrimental impacts to crop plantation. Here we report the pretreatments of urea and NaOH (USH) to enhance maize straw decomposition in the field. The USH reagents interacted synergistically to destruct straw, mainly through breaking the rigid hydrogen bonding network and chemically hydrolyzing recalcitrant lignin. The synergy was evident for the USH reagents containing 6-8% urea and 0.1-1% NaOH under various temperature conditions (-20 °C to 25 °C). The USH (7%/0.1%) pretreatment resulted in notable enhancement (37%) of straw decomposition in the field within 6 months, superior to current biological-based treatments (6-28%). Moreover, this pretreatment posed no influence on the adsorption of straw residues collected at the early stage of decomposition (27 days) toward five commonly used herbicides. Those straw residues collected on 67 days and later exhibited high adsorption capacity, indicated by 0.5- to 4-folded increases in Kd values. Additionally, the impacts to soil pH and bacterial/fungal community were negligible. The USH pretreatments thus have practical interests in mitigating accumulation of straw residues in straw-returned soils.
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Affiliation(s)
- Xudong Jing
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Xuhui Chai
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Shiqin Long
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Tian Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Mingrui Si
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Xuemei Zheng
- Dalian Institute of Administration, Dalian 116013, China
| | - Xiyun Cai
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
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11
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Dhakal N, Acharya B. Syngas Fermentation for the Production of Bio-Based Polymers: A Review. Polymers (Basel) 2021; 13:polym13223917. [PMID: 34833218 PMCID: PMC8618084 DOI: 10.3390/polym13223917] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Revised: 11/04/2021] [Accepted: 11/09/2021] [Indexed: 11/21/2022] Open
Abstract
Increasing environmental awareness among the general public and legislators has driven this modern era to seek alternatives to fossil-derived products such as fuel and plastics. Addressing environmental issues through bio-based products driven from microbial fermentation of synthetic gas (syngas) could be a future endeavor, as this could result in both fuel and plastic in the form of bioethanol and polyhydroxyalkanoates (PHA). Abundant availability in the form of cellulosic, lignocellulosic, and other organic and inorganic wastes presents syngas catalysis as an interesting topic for commercialization. Fascination with syngas fermentation is trending, as it addresses the limitations of conventional technologies like direct biochemical conversion and Fischer–Tropsch’s method for the utilization of lignocellulosic biomass. A plethora of microbial strains is available for syngas fermentation and PHA production, which could be exploited either in an axenic form or in a mixed culture. These microbes constitute diverse biochemical pathways supported by the activity of hydrogenase and carbon monoxide dehydrogenase (CODH), thus resulting in product diversity. There are always possibilities of enzymatic regulation and/or gene tailoring to enhance the process’s effectiveness. PHA productivity drags the techno-economical perspective of syngas fermentation, and this is further influenced by syngas impurities, gas–liquid mass transfer (GLMT), substrate or product inhibition, downstream processing, etc. Product variation and valorization could improve the economical perspective and positively impact commercial sustainability. Moreover, choices of single-stage or multi-stage fermentation processes upon product specification followed by microbial selection could be perceptively optimized.
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12
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Wu M, Gong L, Ma C, He YC. Enhanced enzymatic saccharification of sorghum straw by effective delignification via combined pretreatment with alkali extraction and deep eutectic solvent soaking. BIORESOURCE TECHNOLOGY 2021; 340:125695. [PMID: 34364087 DOI: 10.1016/j.biortech.2021.125695] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 07/26/2021] [Accepted: 07/27/2021] [Indexed: 06/13/2023]
Abstract
Hydrogen bond donor (HBD) in ChCl-based deep eutectic solvent (DESs) had significant influence on the Sorghum straw (SS) pretreatment. Lactic acid (LAC) was chosen as the appropriate HBD for preparing ChCl-based DES to pretreat Sorghum straw (SS). Furthermore, sequential pretreatment with dilute sodium hydroxide (0.75 wt%) for 1 h at 121 °C and ChCl:LAC soaking at 140 °C for 40 min was applied to pretreat SS for removing lignin (78.4%) and xylan (67.6%). Hydrolysis for 72 h, the reducing sugar yield reached 94.9%. Moreover, relationships of delignification and xylan removal with saccharification were explored after pretreatment. Finally, the fermentability of SS-hydrolysates was verified by bioethanol fermentation by S. cerevissiae with the yield of 0.45 g ethanol/g glucose. No significant inhibition was observed on ethanol fermentation. Obviously, establishment of high-efficient combination pretreatment with alkali extraction and ChCl:LAC soaking was successfully demonstrated for enhancing enzymatic saccharification of SS.
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Affiliation(s)
- Mengjia Wu
- National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Pharmacy, Changzhou University, Changzhou, Jiangsu Province 213164, PR China
| | - Lei Gong
- National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Pharmacy, Changzhou University, Changzhou, Jiangsu Province 213164, PR China
| | - Cuiluan Ma
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, Hubei Province 430062, PR China
| | - Yu-Cai He
- National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Pharmacy, Changzhou University, Changzhou, Jiangsu Province 213164, PR China; State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, Hubei Province 430062, PR China.
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13
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Paulraj Gundupalli M, Cheng YS, Chuetor S, Bhattacharyya D, Sriariyanun M. Effect of dewaxing on saccharification and ethanol production from different lignocellulosic biomass. BIORESOURCE TECHNOLOGY 2021; 339:125596. [PMID: 34298246 DOI: 10.1016/j.biortech.2021.125596] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 07/12/2021] [Accepted: 07/14/2021] [Indexed: 06/13/2023]
Abstract
Dewaxing effects on the pretreatment, saccharification and fermentation are rarely reported due to the low abundance of wax in lignocellulose. This study aimed to investigate the effect of wax removal on saccharification and ethanol yield from lignocellulose by using Rice straw (RS), Napier grass (NG), and sugarcane bagasse (SB). The wax contents of 0.56%, 1.7%, and 0.6% were obtained from RS, NG and SB after the wax extraction, respectively. The alkaline pretreatment was applied in combination with dewaxing to decipher the synergistic effect of these treatments. Dewaxing and alkaline pretreatment of lignocellulosic biomass showed changes in the plant compositions. Removal of wax from RS, NG and SB showed significant changes in the surface morphology and functional groups. A higher yield of sugars and ethanol was observed in dewaxed and alkaline pretreated samples. The ethanol yields of 75.4%, 89.85%, and 74% from RS, NG, and SB were obtained after fermentation, respectively.
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Affiliation(s)
- Marttin Paulraj Gundupalli
- Chemical and Process Engineering (CPE), The Sirindhorn International Thai-German Graduate School of Engineering, King Mongkut's University of Technology North Bangkok (KMUTNB), Bangkok, Thailand; Biorefinery and Process Automation Engineering Center (BPAEC), King Mongkut's University of Technology North Bangkok, Bangkok, Thailand
| | - Yu-Shen Cheng
- Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Douliu, Yunlin, Taiwan
| | - Santi Chuetor
- Biorefinery and Process Automation Engineering Center (BPAEC), King Mongkut's University of Technology North Bangkok, Bangkok, Thailand; Department of Chemical Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok, Bangkok, Thailand
| | | | - Malinee Sriariyanun
- Chemical and Process Engineering (CPE), The Sirindhorn International Thai-German Graduate School of Engineering, King Mongkut's University of Technology North Bangkok (KMUTNB), Bangkok, Thailand; Biorefinery and Process Automation Engineering Center (BPAEC), King Mongkut's University of Technology North Bangkok, Bangkok, Thailand.
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14
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Wu P, Kang X, Wang W, Yang G, He L, Fan Y, Cheng X, Sun Y, Li L. Assessment of Coproduction of Ethanol and Methane from Pennisetum purpureum: Effects of Pretreatment, Process Performance, and Mass Balance. ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2021; 9:10771-10784. [PMID: 35141053 PMCID: PMC8815079 DOI: 10.1021/acssuschemeng.1c02010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 07/24/2021] [Indexed: 06/14/2023]
Abstract
To overcome the structural complexity and improve the bioconversion efficiency of Pennisetum purpureum into bioethanol or/and biomethane, the effects of ensiling pretreatment, NaOH pretreatment, and their combination on digestion performance and mass flow were comparatively investigated. The coproduction of bioethanol and biomethane showed that 65.2 g of ethanol and 102.6 g of methane could be obtained from 1 kg of untreated Pennisetum purpureum, and pretreatment had significant impacts on the production; however, there is no significant difference between the results of NaOH pretreatment and ensiling-NaOH pretreatment in terms of production improvement. Among them, 1 kg of ensiling-NaOH treated Pennisetum purpureum could yield 269.4 g of ethanol and 144.5 g of methane, with a respective increase of 313.2% and 40.8% compared to that from the untreated sample; this corresponded to the final energy production of 14.5 MJ, with the energy conversion efficiency of 46.8%. In addition, for the ensiling-NaOH treated Pennisetum purpureum, the energy recovery from coproduction (process III) was 98.9% higher than that from enzymatic hydrolysis and fermentation only (process I) and 53.6% higher than that from anaerobic digestion only (process II). This indicated that coproduction of bioethanol and biomethane from Pennisetum purpureum after ensiling and NaOH pretreatment is an effective method to improve its conversion efficiency and energy output.
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Affiliation(s)
- Peiwen Wu
- Guangzhou
Institute of Energy Conversion, Chinese
Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, China
- Key
Laboratory of Ministry of Education for Water Quality Security and
Protection in Pearl River Delta, Guangdong Provincial Key Laboratory
of Radionuclides Pollution Control and Resources, School of Environmental
Science and Engineering, Guangzhou University, No. 230, Wai Huan Xi Road, Guangzhou 510006, China
| | - Xihui Kang
- MaREI
Centre, Environmental Research Institute, University College Cork, 4 Lee Road, Sunday’s Well, Cork, Ireland
| | - Wen Wang
- Guangzhou
Institute of Energy Conversion, Chinese
Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, China
- Guangzhou
Institute of Energy Conversion, CAS Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
- Guangdong
Key Laboratory of New and Renewable Energy Research and Development, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
| | - Gaixiu Yang
- Guangzhou
Institute of Energy Conversion, Chinese
Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, China
- Guangzhou
Institute of Energy Conversion, CAS Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
- Guangdong
Key Laboratory of New and Renewable Energy Research and Development, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
| | - Linsong He
- Guangzhou
Institute of Energy Conversion, Chinese
Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, China
- Guangzhou
Institute of Energy Conversion, CAS Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
- Guangdong
Key Laboratory of New and Renewable Energy Research and Development, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
| | - Yafeng Fan
- Guangzhou
Institute of Energy Conversion, Chinese
Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, China
- Guangzhou
Institute of Energy Conversion, CAS Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
- Guangdong
Key Laboratory of New and Renewable Energy Research and Development, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
| | - Xingyu Cheng
- Guangzhou
Institute of Energy Conversion, Chinese
Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, China
- Guangzhou
Institute of Energy Conversion, CAS Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
- Guangdong
Key Laboratory of New and Renewable Energy Research and Development, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
| | - Yongming Sun
- Guangzhou
Institute of Energy Conversion, Chinese
Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, China
- Guangzhou
Institute of Energy Conversion, CAS Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
- Guangdong
Key Laboratory of New and Renewable Energy Research and Development, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
| | - Lianhua Li
- Guangzhou
Institute of Energy Conversion, Chinese
Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, China
- Guangzhou
Institute of Energy Conversion, CAS Key Laboratory of Renewable Energy, Chinese Academy of Sciences, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
- Guangdong
Key Laboratory of New and Renewable Energy Research and Development, No. 2, Nengyuan Road, Guangzhou 510640, P.R. China
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15
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Sun SC, Sun D, Cao XF. Effect of integrated treatment on enhancing the enzymatic hydrolysis of cocksfoot grass and the structural characteristics of co-produced hemicelluloses. BIOTECHNOLOGY FOR BIOFUELS 2021; 14:88. [PMID: 33827662 PMCID: PMC8028065 DOI: 10.1186/s13068-021-01944-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 03/30/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Cocksfoot grass (Dactylis glomerata L.) with high biomass yield and rich cellulose can be used to produce bioethanol as fuel additive. In view of this, ultrasonic and hydrothermal pretreatments followed by successive alkali extractions were assembled into an integrated biorefinery process applied on cocksfoot grass to improve its enzymatic hydrolysis. In this work, the effects of ultrasonic and hydrothermal pretreatments followed by sequential alkali extractions on the enzymatic hydrolysis of cocksfoot grass were investigated. In addition, since large amount of hemicelluloses were released during the hydrothermal pretreatment and alkali extraction process, the yields, structural characteristics and differentials of water- and alkali-soluble hemicellulosic fractions isolated from different treatments were also comparatively explored. RESULTS The integrated treatment significantly removed amorphous hemicelluloses and lignin, resulting in increased crystallinity of the treated residues. A maximum saccharification rate of 95.1% was obtained from the cellulose-rich substrate after the integrated treatment. In addition, the considerable hemicelluloses (31.4% water-soluble hemicelluloses and 53.4% alkali-soluble hemicelluloses) were isolated during the integrated treatment. The released water-soluble hemicellulosic fractions were found to be more branched as compared with the alkali-soluble hemicellulosic fractions and all hemicellulosic fractions were mixed polysaccharides mainly composed of branched xylans and β-glucans. CONCLUSION The combination of ultrasonic and hydrothermal pretreatments followed by successive alkali extractions can dramatically increase the enzymatic saccharification rate of the substrates and produce considerable amounts of hemicelluloses. Detailed information about the enzymatic hydrolysis rates of the treated substrates and the structural characteristics of the co-produced hemicelluloses will help the synergistic utilization of cellulose and hemicellulose in cocksfoot grass.
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Affiliation(s)
- Shao-Chao Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083 China
| | - Dan Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083 China
| | - Xue-Fei Cao
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083 China
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16
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Jin C, Bao J. Lysine Production by Dry Biorefining of Wheat Straw and Cofermentation of Corynebacterium glutamicum. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:1900-1906. [PMID: 33539090 DOI: 10.1021/acs.jafc.0c07902] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A preliminary study shows that lysine production from lignocellulose feedstock is feasible, but the conversion of xylose in lignocellulose to lysine remains unsolved. Two technical barriers are responsible for the remaining xylose conversion: one is the xylose loss into the wastewater stream of the biorefinery processing chain, and the other is the lack of efficient lysine-producing strain with xylose utilization. Here, we conducted a new biorefinery approach of consequent dry acid pretreatment and biodetoxification, resulting in zero wastewater generation and then well-preserved xylose. To provide the lysine-producing strain with xylose utilization, we modified the Corynebacterium glutamicum by establishing the xylose assimilation pathway and improving the NADPH cofactor regeneration. The combinational modification of biorefinery processing and strain development led to 31.3 g/L of lysine production with a yield of 0.23 g lysine per gram of wheat straw derived sugars. This study provides a practical method for upgraded lysine production from lignocellulose for future industrial applications.
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Affiliation(s)
- Ci Jin
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Jie Bao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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17
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Chen C, Deng X, Kong W, Qaseem MF, Zhao S, Li Y, Wu AM. Rice Straws With Different Cell Wall Components Differ on Abilities of Saccharification. Front Bioeng Biotechnol 2021; 8:624314. [PMID: 33553128 PMCID: PMC7855461 DOI: 10.3389/fbioe.2020.624314] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Accepted: 12/21/2020] [Indexed: 11/13/2022] Open
Abstract
Rice straw has an enormous amount of biomass for energy use, but the complexity of the cell wall component hinders technical processes. Although belonging to rice straws, the straws from different varieties should be with different treatment strategies to obtain best energy efficiency. To confirm this hypothesis, 7 different rice varieties (RPY GENG, RIL269, RIL272, RIL31, RIL57, RIL06, LUOHUI 9) with different cell wall traits from RIL population were evaluated for their response toward different pretreatments. For japonica RPY GENG, 2% of H2SO4 acid was best pre-treatment while high acid (5% of H2SO4) pretreatment caused undue loss. For Indica LUOHUI 9 rice, high acid pretreatment was suitable, while RIL57 had maximum of glucose yield with high alkali (10% NaOH) pretreatment. High-concentration alkali pretreatment is the most convenient and effective pretreatment method for the treatment of unknown varieties of rice straws, because the lignin has been removed and has the lowest negative effects on the glucose yield under the high alkali condition. As the RILs used in this study vary considerably in their wall structure, an understanding of their response to different pre-treatments confirms our hypothesis and help us to understand the influence of different wall compositions on the final output.
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Affiliation(s)
- Chen Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory of Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China.,Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architectures, South China Agricultural University, Guangzhou, China
| | - Xiaoxiao Deng
- State Key Laboratory for Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, China
| | - Weilong Kong
- State Key Laboratory for Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, China
| | - Mirza Faisal Qaseem
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory of Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China.,Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architectures, South China Agricultural University, Guangzhou, China
| | - Shuai Zhao
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Research Center for Microbial and Enzyme Engineering Technology, College of Life Science and Technology, Guangxi University, Nanning, China
| | - Yangsheng Li
- State Key Laboratory for Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, China
| | - Ai-Min Wu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, China.,Guangdong Laboratory of Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China.,Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architectures, South China Agricultural University, Guangzhou, China
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18
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Prakesh A, Dave V, Sur S, Sharma P. Vivid techniques of pretreatment showing promising results in biofuel production and food processing. J FOOD PROCESS ENG 2021. [DOI: 10.1111/jfpe.13580] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Anand Prakesh
- Department of Bio‐science and Biotechnology Banasthali Vidyapith Banasthali India
| | - Vivek Dave
- Department of Pharmacy, School of Health Science Central University of South Bihar Gaya India
| | - Srija Sur
- Department of Pharmacy Banasthali Vidyapith Banasthali India
| | - Prashansa Sharma
- Department of Clothing & Textile, Faculty of Home Science Banasthali Vidyapith Banasthali India
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19
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Infanzón-Rodríguez MI, Ragazzo-Sánchez JA, Del Moral S, Calderón-Santoyo M, Aguilar-Uscanga MG. Enzymatic hydrolysis of lignocellulosic biomass using native cellulase produced by Aspergillus niger ITV02 under liquid state fermentation. Biotechnol Appl Biochem 2021; 69:198-208. [PMID: 33459401 DOI: 10.1002/bab.2097] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 12/13/2020] [Indexed: 11/11/2022]
Abstract
The objective of this work was to evaluate the biochemical characteristics of an enzymatic extract obtained from autochthonous fungus Aspergillus niger ITV02 and its application in the enzymatic hydrolysis of wheat straw and corn stubble pretreated by steam explosion. The enzymatic extract was obtained by submerged fermentation using delignified sweet sorghum bagasse as a carbon source. The results obtained showed that the enzymatic extract had β-glucosidase and endoglucanase activities. The effects of pH and temperature on cellulase activity were evaluated and its thermostability was determined. The optimal parameters of the β-glucosidase and endoglucanase activities obtained were pH 5 and 70 °C. The enzymatic extract of A. niger ITV02 was used to hydrolyze wheat straw and corn stubble, and the hydrolysis yields were compared with those obtained by a commercial cellulase (Celluclast 1.5L NS 50013) and CellicCTec3. The results showed that with the use the mixture of Celluclast 1.5L-A. niger ITV02 and CellicCTec3-A. niger ITV02 in the hydrolysis, conversions of 86.36% and 67.8% were obtained, respectively. Glucose production for the mixture extract increased 2.15 times more than when the enzyme was used independently alone. The present work shows that A. niger ITV02 has a potential as an enzyme producer for lignocellulosic hydrolysis.
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Affiliation(s)
| | - Juan Arturo Ragazzo-Sánchez
- Tecnológico Nacional de México/I. T. de Tepic, Laboratorio Integral de Investigación en Alimentos, Tepic, México
| | - Sandra Del Moral
- Cátedra-CONACYT, Tecnológico Nacional de México/I. T. de Veracruz-UNIDA, Veracruz, México
| | - Montserrat Calderón-Santoyo
- Tecnológico Nacional de México/I. T. de Tepic, Laboratorio Integral de Investigación en Alimentos, Tepic, México
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20
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Feng F, Zeng B, Ouyang S, Zhong Y, Chen J. Optimization of alkali-treated poplar fiber saccharification using metal ions and surfactants. Bioengineered 2020; 12:138-150. [PMID: 33350341 PMCID: PMC8806347 DOI: 10.1080/21655979.2020.1857576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
In this study, contrary to untreated poplar fiber, processing of alkali-treated poplar fiber was optimized for the enzymatic saccharification. Considering reducing sugar content as the evaluation index, pH, temperature, time, amount of enzyme, and rotational speed of shaker were standardized to optimize the sugar production by enzymatic hydrolysis. Using response surface methodology, the optimum technological condition of enzymatic hydrolysis was found to be utilizing 43 mg cellulase at 46 °C for 50 h. At this, the sugar conversion amount of NaOH or H2O2-NaOH pretreated poplar was 164.62 mg/g and 218.82 mg/g respectively. It was a corresponding increase of 446.73% or 626.75% than that of poplar fiber without a pretreatment. At a low concentration, metal ions and surfactants promoted the conversion of reducing sugar. Especially, 0.01 g/L Mn2+ and 0.50 g/L hexadecyl trimethyl ammonium bromide (CTAB) produced the best effect and increased the conversion rate of reducing sugar by 23.62% and 21.44% respectively. Also, the effect of the combination of metal ions and surfactants was better than that of a single accelerator. By improving the enzymatic process, these findings could enhance the utilization of poplar fiber for the production of reducing sugar.
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Affiliation(s)
- Fan Feng
- College of Life Science and Technology, Central South University of Forestry & Technology , Changsha, China
| | - Baiquan Zeng
- College of Life Science and Technology, Central South University of Forestry & Technology , Changsha, China
| | - Shilin Ouyang
- College of Life Science and Technology, Central South University of Forestry & Technology , Changsha, China
| | - Yanan Zhong
- College of Life Science and Technology, Central South University of Forestry & Technology , Changsha, China
| | - Jienan Chen
- Ministry of Forestry Bioethanol Research Center , Changsha, China.,Hunan Engineering Research Center for Woody Biomass Conversion , Changsha, China
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21
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Vu HP, Nguyen LN, Vu MT, Johir MAH, McLaughlan R, Nghiem LD. A comprehensive review on the framework to valorise lignocellulosic biomass as biorefinery feedstocks. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 743:140630. [PMID: 32679491 DOI: 10.1016/j.scitotenv.2020.140630] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 06/22/2020] [Accepted: 06/28/2020] [Indexed: 05/26/2023]
Abstract
An effective pretreatment is the first step to enhance the digestibility of lignocellulosic biomass - a source of renewable, eco-friendly and energy-dense materials - for biofuel and biochemical productions. This review aims to provide a comprehensive assessment on the advantages and disadvantages of lignocellulosic pretreatment techniques, which have been studied at the lab-, pilot- and full-scale levels. Biological pretreatment is environmentally friendly but time consuming (i.e. 15-40 days). Chemical pretreatment is effective in breaking down lignocellulose and increasing sugar yield (e.g. 4 to 10-fold improvement) but entails chemical cost and expensive reactors. Whereas the combination of physical and chemical (i.e. physicochemical) pretreatment is energy intensive (e.g. energy production can only compensate 80% of the input energy) despite offering good process efficiency (i.e. > 100% increase in product yield). Demonstrations of pretreatment techniques (e.g. acid, alkaline, and hydrothermal) in pilot-scale have reported 50-80% hemicellulose solubilisation and enhanced sugar yields. The feasibility of these pilot and full-scale plants has been supported by government subsidies to encourage biofuel consumption (e.g. tax credits and mandates). Due to the variability in their mechanisms and characteristics, no superior pretreatment has been identified. The main challenge lies in the capability to achieve a positive energy balance and great economic viability with minimal environmental impacts i.e. the energy or product output significantly surpasses the energy and monetary input. Enhancement of the current pretreatment techno-economic efficiency (e.g. higher product yield, chemical recycling, and by-products conversion to increase environmental sustainability) and the integration of pretreatment methods to effectively treat a range of biomass will be the steppingstone for commercial lignocellulosic biorefineries.
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Affiliation(s)
- Hang P Vu
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2220, Australia
| | - Luong N Nguyen
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2220, Australia.
| | - Minh T Vu
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2220, Australia
| | - Md Abu Hasan Johir
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2220, Australia
| | - Robert McLaughlan
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2220, Australia
| | - Long D Nghiem
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW 2220, Australia; NTT Institute of Hi-Technology, Nguyen Tat Thanh University, Ho Chi Minh City, Viet Nam
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22
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Ma Y, Shen Y, Liu Y. State of the art of straw treatment technology: Challenges and solutions forward. BIORESOURCE TECHNOLOGY 2020; 313:123656. [PMID: 32561106 DOI: 10.1016/j.biortech.2020.123656] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 06/05/2020] [Accepted: 06/06/2020] [Indexed: 05/28/2023]
Abstract
Straw as an agricultural byproduct has been recognized as a potential resource. However, open-field straw burning is still the main mean in many regions of the world, which causes the wasting of resource and air pollution. Recently, many technologies have been developed for energy and resource recovery from straw, of which the biological approach has attracted growing interests because of its economically viable and eco-friendly nature. However, pretreatment of straw prior to biological processes is essential, and largely determines the process feasibility, economic viability and environmental sustainability. Thus, this review attempts to offer a critical and holistic analysis of current straw pretreatment technologies and management practices. Specifically, an integrated biological processes coupled with microbial degradation and enzymatic hydrolysis was proposed, and its potential benefits, limitations and challenges associated with future large-scale straw treatment were also elaborated, together with the perspectives and directions forward.
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Affiliation(s)
- Yingqun Ma
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Yanqing Shen
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Yu Liu
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
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23
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Bioethanol production from cereal crops and lignocelluloses rich agro-residues: prospects and challenges. SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-020-03471-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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24
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Suhag M, Kumar A, Singh J. Saccharification and fermentation of pretreated banana leaf waste for ethanol production. SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-020-03215-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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25
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Barcelos MCS, Ramos CL, Kuddus M, Rodriguez-Couto S, Srivastava N, Ramteke PW, Mishra PK, Molina G. Enzymatic potential for the valorization of agro-industrial by-products. Biotechnol Lett 2020; 42:1799-1827. [DOI: 10.1007/s10529-020-02957-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 06/30/2020] [Indexed: 12/13/2022]
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26
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Nedumaran M, Singh S, Jamaldheen SB, Nath P, Moholkar VS, Goyal A. Assessment of combination of pretreatment of Sorghum durra stalk and production of chimeric enzyme (β-glucosidase and endo β-1,4 glucanase, CtGH1-L1- CtGH5-F194A) and cellobiohydrolase ( CtCBH5A) for saccharification to produce bioethanol. Prep Biochem Biotechnol 2020; 50:883-896. [PMID: 32425106 DOI: 10.1080/10826068.2020.1762214] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Optimization of pretreatment and saccharification of Sorghum durra stalk (Sds) was carried out. The chimeric enzyme (CtGH1-L1-CtGH5-F194A) having β-glucosidase (CtGH1) and endo β-1,4 glucanase activity (CtGH5-F194A) and cellobiohydrolase (CtCBH5A) from Clostridium thermocellum were used for saccharification. Chimeric enzyme will save production cost of two enzymes, individually. Stage 2 pretreatment by 1% (w/v) NaOH assisted autoclaving + 1.5% (v/v) dilute H2SO4 assisted oven heating gave lower total sugar yield (366.6 mg/g of pretreated Sds) and total glucose yield (195 mg/g of pretreated Sds) in pretreated hydrolysate with highest crystallinity index 55.6% than the other stage 2 pretreatments. Optimized parameters for saccharification of above stage 2 pretreated biomass were 3% (w/v) biomass concentration, enzyme (chimera: cellobiohydrolase) ratio, 2:3 (U/g) of biomass, total enzyme loading (350 U/g of pretreated biomass), 24 h and 30 °C. Best stage 2 pretreated Sds under optimized enzyme saccharification conditions gave maximum total reducing sugar yield 417 mg/g and glucose yield 285 mg/g pretreated biomass in hydrolysate. Best stage 2 pretreated Sds showed significantly higher cellulose, 71.3% and lower lignin, 2.0% and hemicellulose, 12.2% (w/w) content suggesting the effectiveness of method. This hydrolysate upon SHF using Saccharomyces cerevisiae under unoptimized conditions produced ethanol yield, 0.12 g/g of glucose. Abbreviation: Ct-Clostridium thermocellum, Sds-Sorghum durra stalk, TRS-Total reducing sugar, HPLC-High performance liquid chromatography, RI-Refractive index, ADL-acid insoluble lignin, GYE-Glucose yeast extract, MGYP-Malt glucose yeast extract peptone, SHF-separate hydrolysis and fermentation, OD-Optical density, PVDF-Poly vinylidene fluoride, TS-total sugar, FESEM-Field emission scanning electron microscopy, XRD-X-ray diffraction, FTIR-Fourier transform infra-red spectroscopy and CrI-Crystallinity index.
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Affiliation(s)
- Mohanapriya Nedumaran
- Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, India
| | - Shweta Singh
- Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, India.,DBT PAN-IIT Centre for Bioenergy, Indian Institute of Technology Guwahati, Guwahati, India
| | - Sumitha Banu Jamaldheen
- DBT PAN-IIT Centre for Bioenergy, Indian Institute of Technology Guwahati, Guwahati, India.,Centre for Energy, Indian Institute of Technology Guwahati, Guwahati, India
| | - Priyanka Nath
- Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, India.,DBT PAN-IIT Centre for Bioenergy, Indian Institute of Technology Guwahati, Guwahati, India
| | - Vijayanand Suryakant Moholkar
- Centre for Energy, Indian Institute of Technology Guwahati, Guwahati, India.,Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, India
| | - Arun Goyal
- Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, India.,DBT PAN-IIT Centre for Bioenergy, Indian Institute of Technology Guwahati, Guwahati, India.,Centre for Energy, Indian Institute of Technology Guwahati, Guwahati, India
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27
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Application of enzyme cocktails from Indonesian isolates to corncob (Zea mays) waste saccharification. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2020.101537] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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28
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Sun D, Sun SC, Wang B, Sun SF, Shi Q, Zheng L, Wang SF, Liu SJ, Li MF, Cao XF, Sun SN, Sun RC. Effect of various pretreatments on improving cellulose enzymatic digestibility of tobacco stalk and the structural features of co-produced hemicelluloses. BIORESOURCE TECHNOLOGY 2020; 297:122471. [PMID: 31787511 DOI: 10.1016/j.biortech.2019.122471] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Revised: 11/15/2019] [Accepted: 11/16/2019] [Indexed: 06/10/2023]
Abstract
Hereon, tobacco stalk was deconstructed by lyophilization, ball-milling, ultrasound-assisted alkali extraction, hydrothermal pretreatment (HTP), and alkali presoaking, respectively, followed by dilute alkali cooking to both improve its enzymatic digestibility and isolate the hemicellulosic streams. It was found that a maximum cellulose saccharification rate of 93.5% was achieved from the integrated substrate by ball-milling and dilute alkali cooking, which was 4.4-fold higher than that from the raw material. Interestingly, in this case, 76.9% of hemicelluloses were simultaneously recovered during the integrated treatment. Structural determination indicated that the hemicelluloses released from tobacco stalk by dilute alkali cooking were mixed polysaccharides, and the (1 → 4)-linked β-D-Xylp backbone branched with L-Araf units at O-2/O-3 and 4-O-Me-α-D-GlcpA units at O-2 of the xylose residues was the main structure. In comparison, ultrasound-assisted alkali extraction, ball-milling, and HTP favored the extraction of hemicelluloses with less branched structure and lower molecular weights in the following alkali cooking.
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Affiliation(s)
- Dan Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Shao-Chao Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Bin Wang
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Shao-Fei Sun
- Key Laboratory for Forest Resources Conservation and Utilisation in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming 650224, PR China
| | - Quentin Shi
- Shanghai Dssun New Material Co., Ltd., Shanghai 200233, China
| | - Lu Zheng
- Shanghai Dssun New Material Co., Ltd., Shanghai 200233, China
| | - Shuang-Fei Wang
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530000, China
| | - Shi-Jie Liu
- College of Light Science and Engineer, South China University of Technology, Guangzhou 510641, China
| | - Ming-Fei Li
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Xue-Fei Cao
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Shao-Ni Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
| | - Run-Cang Sun
- Center for Lignocellulose Science and Engineering, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
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29
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Study on the Sequential Combination of Bioethanol and Biogas Production from Corn Straw. Molecules 2019; 24:molecules24244558. [PMID: 31842493 PMCID: PMC6943537 DOI: 10.3390/molecules24244558] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 12/09/2019] [Accepted: 12/12/2019] [Indexed: 11/16/2022] Open
Abstract
The objective of this study was to obtain two types of fuels, i.e., bioethanol and biogas, in a sequential combination of biochemical processes from lignocellulosic biomass (corn straw). Waste from the agricultural sector containing lignocellulose structures was used to obtain bioethanol, while the post-fermentation (cellulose stillage) residue obtained from ethanol fermentation was a raw material for the production of high-power biogas in the methane fermentation process. The studies on obtaining ethanol from lignocellulosic substrate were based on the simultaneous saccharification and fermentation (SSF) method, which is a simultaneous hydrolysis of enzymatic cellulose and fermentation of the obtained sugars. Saccharomyces cerevisiae (D-2) in the form of yeast cream was used for bioethanol production. The yeast strain D-2 originated from the collection of the Institute of Agricultural and Food Biotechnology. Volatile compounds identified in the distillates were measured using gas chromatography with flame ionization detector (GC-FID). CH4 and CO2 contained in the biogas were analyzed using a gas chromatograph in isothermal conditions, equipped with thermal conductivity detector (katharometer) with incandescent fiber. Our results show that simultaneous saccharification and fermentation enables production of bioethanol from agricultural residues with management of cellulose stillage in the methane fermentation process.
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30
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Dong M, Wang S, Xiao G, Xu F, Hu W, Li Q, Chen J, Li W. Cellulase production by Aspergillus fumigatus MS13.1 mutant generated by heavy ion mutagenesis and its efficient saccharification of pretreated sweet sorghum straw. Process Biochem 2019. [DOI: 10.1016/j.procbio.2019.06.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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31
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Ding D, Li P, Zhang X, Ramaswamy S, Xu F. Synergy of hemicelluloses removal and bovine serum albumin blocking of lignin for enhanced enzymatic hydrolysis. BIORESOURCE TECHNOLOGY 2019; 273:231-236. [PMID: 30447624 DOI: 10.1016/j.biortech.2018.11.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/06/2018] [Accepted: 11/07/2018] [Indexed: 06/09/2023]
Abstract
A cost efficient synergistic strategy combining mild alkaline pretreatment (0.5-5% NaOH at 70 °C for 60 min) and bovine serum albumin (BSA) blocking of lignin was evaluated for effective conversion of poplar. The highest glucose yield of 69.2% was obtained for 5% alkaline pretreated sample, which was 4.4 times that of untreated sample. The enhanced enzymatic hydrolysis was attributed to significant hemicelluloses removal with limited delignification. Delignification mainly occurred in secondary wall, leading to more open cell wall structure, thus facilitating better transport of enzyme. Hemicelluloses removal helped split adjacent microfibrils, thus increased the specific sites for cellulase binding. After BSA addition in enzymatic hydrolysis, cellulose conversion further improved to 78.4% with 33% reduction of cellulase dosage due to decreased non-specific adsorption of cellulase on residual lignin. The utilization of synergistic alkaline pretreatment - BSA strategy may improve the overall economics of biomass conversion and successful commercial implementation of biorefineries.
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Affiliation(s)
- Dayong Ding
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Pengyun Li
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Xueming Zhang
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Shri Ramaswamy
- Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA
| | - Feng Xu
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
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32
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Fan M, Zhang S, Ye G, Zhang H, Xie J. Integrating sugarcane molasses into sequential cellulosic biofuel production based on SSF process of high solid loading. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:329. [PMID: 30568729 PMCID: PMC6297951 DOI: 10.1186/s13068-018-1328-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 12/01/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND Sugarcane bagasse (SCB) is one of the most promising lignocellulosic biomasses for use in the production of biofuels. However, bioethanol production from pure SCB fermentation is still limited by its high process cost and low fermentation efficiency. Sugarcane molasses, as a carbohydrate-rich biomass, can provide fermentable sugars for ethanol production. Herein, to reduce high processing costs, molasses was integrated into lignocellulosic ethanol production in batch modes to improve the fermentation system and to boost the final ethanol concentration and yield. RESULTS The co-fermentation of pretreated SCB and molasses at ratios of 3:1 (mixture A) and 1:1 (mixture B) were conducted at solid loadings of 12% to 32%, and the fermentation of pretreated SCB alone at the same solid loading was also compared. At a solid loading of 32%, the ethanol concentrations of 64.10 g/L, 74.69 g/L, and 75.64 g/L were obtained from pure SCB, mixture A, and mixture B, respectively. To further boost the ethanol concentration, the fermentation of mixture B (1:1), with higher solid loading from 36 to 48%, was also implemented. The highest ethanol concentration of 94.20 g/L was generated at a high solid loading of 44%, with an ethanol yield of 72.37%. In addition, after evaporation, the wastewater could be converted to biogas by anaerobic digestion. The final methane production of 312.14 mL/g volatile solids (VS) was obtained, and the final chemical oxygen demand removal and VS degradation efficiency was 85.9% and 95.9%, respectively. CONCLUSIONS Molasses could provide a good environment for the growth of yeast and inoculum. Integrating sugarcane molasses into sequential cellulosic biofuel production could improve the utilization of biomass resources.
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Affiliation(s)
- Meishan Fan
- College of Forestry and Landscape Architecture, Guangdong Engineering Technology Research Center of Agricultural and Forestry Biomass, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture, South China Agricultural University, Guangzhou, 510642 People’s Republic of China
| | - Shuaishuai Zhang
- College of Forestry and Landscape Architecture, Guangdong Engineering Technology Research Center of Agricultural and Forestry Biomass, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture, South China Agricultural University, Guangzhou, 510642 People’s Republic of China
| | - Guangying Ye
- College of Forestry and Landscape Architecture, Guangdong Engineering Technology Research Center of Agricultural and Forestry Biomass, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture, South China Agricultural University, Guangzhou, 510642 People’s Republic of China
| | - Hongdan Zhang
- College of Forestry and Landscape Architecture, Guangdong Engineering Technology Research Center of Agricultural and Forestry Biomass, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture, South China Agricultural University, Guangzhou, 510642 People’s Republic of China
| | - Jun Xie
- College of Forestry and Landscape Architecture, Guangdong Engineering Technology Research Center of Agricultural and Forestry Biomass, Key Laboratory of Energy Plants Resource and Utilization, Ministry of Agriculture, South China Agricultural University, Guangzhou, 510642 People’s Republic of China
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33
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Kucharska K, Łukajtis R, Słupek E, Cieśliński H, Rybarczyk P, Kamiński M. Hydrogen Production from Energy Poplar Preceded by MEA Pre-Treatment and Enzymatic Hydrolysis. Molecules 2018; 23:molecules23113029. [PMID: 30463326 PMCID: PMC6278490 DOI: 10.3390/molecules23113029] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 11/12/2018] [Accepted: 11/13/2018] [Indexed: 01/11/2023] Open
Abstract
The need to pre-treat lignocellulosic biomass prior to dark fermentation results primarily from the composition of lignocellulose because lignin hinders the processing of hard wood towards useful products. Hence, in this work a two-step approach for the pre-treatment of energy poplar, including alkaline pre-treatment and enzymatic saccharification followed by fermentation has been studied. Monoethanolamine (MEA) was used as the alkaline catalyst and diatomite immobilized bed enzymes were used during saccharification. The response surface methodology (RSM) method was used to determine the optimal alkaline pre-treatment conditions resulting in the highest values of both total released sugars (TRS) yield and degree of lignin removal. Three variable parameters (temperature, MEA concentration, time) were selected to optimize the alkaline pre-treatment conditions. The research was carried out using the Box-Behnken design. Additionally, the possibility of the re-use of both alkaline as well as enzymatic reagents was investigated. Obtained hydrolysates were subjected to dark fermentation in batch reactors performed by Enterobacter aerogenes ATCC 13048 with a final result of 22.99 mL H₂/g energy poplar (0.6 mol H₂/mol TRS).
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Affiliation(s)
- Karolina Kucharska
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 Street, 80-233 Gdańsk, Poland.
| | - Rafał Łukajtis
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 Street, 80-233 Gdańsk, Poland.
| | - Edyta Słupek
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 Street, 80-233 Gdańsk, Poland.
| | - Hubert Cieśliński
- Department of Molecular Biotechnology and Microbiology, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 Street, 80-233 Gdańsk, Poland.
| | - Piotr Rybarczyk
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 Street, 80-233 Gdańsk, Poland.
| | - Marian Kamiński
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, Narutowicza 11/12 Street, 80-233 Gdańsk, Poland.
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34
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Kucharska K, Rybarczyk P, Hołowacz I, Łukajtis R, Glinka M, Kamiński M. Pretreatment of Lignocellulosic Materials as Substrates for Fermentation Processes. Molecules 2018; 23:E2937. [PMID: 30423814 PMCID: PMC6278514 DOI: 10.3390/molecules23112937] [Citation(s) in RCA: 146] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 11/01/2018] [Accepted: 11/08/2018] [Indexed: 11/17/2022] Open
Abstract
Lignocellulosic biomass is an abundant and renewable resource that potentially contains large amounts of energy. It is an interesting alternative for fossil fuels, allowing the production of biofuels and other organic compounds. In this paper, a review devoted to the processing of lignocellulosic materials as substrates for fermentation processes is presented. The review focuses on physical, chemical, physicochemical, enzymatic, and microbiologic methods of biomass pretreatment. In addition to the evaluation of the mentioned methods, the aim of the paper is to understand the possibilities of the biomass pretreatment and their influence on the efficiency of biofuels and organic compounds production. The effects of different pretreatment methods on the lignocellulosic biomass structure are described along with a discussion of the benefits and drawbacks of each method, including the potential generation of inhibitory compounds for enzymatic hydrolysis, the effect on cellulose digestibility, the generation of compounds that are toxic for the environment, and energy and economic demand. The results of the investigations imply that only the stepwise pretreatment procedure may ensure effective fermentation of the lignocellulosic biomass. Pretreatment step is still a challenge for obtaining cost-effective and competitive technology for large-scale conversion of lignocellulosic biomass into fermentable sugars with low inhibitory concentration.
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Affiliation(s)
- Karolina Kucharska
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
| | - Piotr Rybarczyk
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
| | - Iwona Hołowacz
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
| | - Rafał Łukajtis
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
| | - Marta Glinka
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
- Department of Analytical Chemistry, Faculty of Chemistry, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
| | - Marian Kamiński
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, 80-233 Gdańsk, Poland.
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35
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Nitric Acid Pretreatment of Jerusalem Artichoke Stalks for Enzymatic Saccharification and Bioethanol Production. ENERGIES 2018. [DOI: 10.3390/en11082153] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
This paper evaluated the effectiveness of nitric acid pretreatment on the hydrolysis and subsequent fermentation of Jerusalem artichoke stalks (JAS). Jerusalem artichoke is considered a potential candidate for producing bioethanol due to its low soil and climate requirements, and high biomass yield. However, its stalks have a complexed lignocellulosic structure, so appropriate pretreatment is necessary prior to enzymatic hydrolysis, to enhance the amount of sugar that can be obtained. Nitric acid is a promising catalyst for the pretreatment of lignocellulosic biomass due to the high efficiency with which it removes hemicelluloses. Nitric acid was found to be the most effective catalyst of JAS biomass. A higher concentration of glucose and ethanol was achieved after hydrolysis and fermentation of 5% (w/v) HNO3-pretreated JAS, leading to 38.5 g/L of glucose after saccharification, which corresponds to 89% of theoretical enzymatic hydrolysis yield, and 9.5 g/L of ethanol. However, after fermentation there was still a significant amount of glucose in the medium. In comparison to more commonly used acids (H2SO4 and HCl) and alkalis (NaOH and KOH), glucose yield (% of theoretical yield) was approximately 47–74% higher with HNO3. The fermentation of 5% nitric-acid pretreated hydrolysates with the absence of solid residues, led to an increase in ethanol yield by almost 30%, reaching 77–82% of theoretical yield.
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Jamaldheen SB, Sharma K, Rani A, Moholkar VS, Goyal A. Comparative analysis of pretreatment methods on sorghum (Sorghum durra) stalk agrowaste for holocellulose content. Prep Biochem Biotechnol 2018; 48:457-464. [DOI: 10.1080/10826068.2018.1466148] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Sumitha Banu Jamaldheen
- Centre for Energy, Indian Institute of Technology Guwahati, Guwahati, India
- DBT PAN-IIT Center for Bioenergy, Indian Institute of Technology Guwahati, Guwahati, India
| | - Kedar Sharma
- DBT PAN-IIT Center for Bioenergy, Indian Institute of Technology Guwahati, Guwahati, India
- Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, India
| | - Aruna Rani
- DBT PAN-IIT Center for Bioenergy, Indian Institute of Technology Guwahati, Guwahati, India
- Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, India
| | - Vijayanand S. Moholkar
- Centre for Energy, Indian Institute of Technology Guwahati, Guwahati, India
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, India
| | - Arun Goyal
- Centre for Energy, Indian Institute of Technology Guwahati, Guwahati, India
- DBT PAN-IIT Center for Bioenergy, Indian Institute of Technology Guwahati, Guwahati, India
- Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, India
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An Assessment of the Sustainability of Lignocellulosic Bioethanol Production from Wastes in Iceland. ENERGIES 2018. [DOI: 10.3390/en11061493] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Optimization of Saccharification Conditions of Lignocellulosic Biomass under Alkaline Pre-Treatment and Enzymatic Hydrolysis. ENERGIES 2018. [DOI: 10.3390/en11040886] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Miyamoto T, Yamamura M, Tobimatsu Y, Suzuki S, Kojima M, Takabe K, Terajima Y, Mihashi A, Kobayashi Y, Umezawa T. A comparative study of the biomass properties of Erianthus and sugarcane: lignocellulose structure, alkaline delignification rate, and enzymatic saccharification efficiency. Biosci Biotechnol Biochem 2018; 82:1143-1152. [PMID: 29558856 DOI: 10.1080/09168451.2018.1447358] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A comprehensive understanding of the structure and properties of gramineous lignocelluloses is needed to facilitate their uses in biorefinery. In this study, lignocelluloses from fractionated internode tissues of two taxonomically close species, Erianthus arundinaceus and sugarcane (Saccharum spp.), were characterized. Our analyses determined that syringyl (S) lignins were predominant over guaiacyl (G) or p-hydroxyphenyl (H) lignins in sugarcane tissues; on the other hand, S lignin levels were similar to those of G lignin in Erianthus tissues. In addition, tricin units were detected in sugarcane tissues, but not in Erianthus tissues. Distributions of lignin inter-monomeric linkage types were also different in Erianthus and sugarcane tissues. Alkaline treatment removed lignins from sugarcane tissues more efficiently than Erianthus tissues, resulting in a higher enzymatic digestibility of sugarcane tissues compared with Erianthus tissues. Our data indicate that Erianthus biomass displayed resistance to alkaline delignification and enzymatic digestion.
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Affiliation(s)
- Takuji Miyamoto
- a Research Institute for Sustainable Humanosphere, Kyoto University , Uji, Kyoto , Japan
| | - Masaomi Yamamura
- a Research Institute for Sustainable Humanosphere, Kyoto University , Uji, Kyoto , Japan
| | - Yuki Tobimatsu
- a Research Institute for Sustainable Humanosphere, Kyoto University , Uji, Kyoto , Japan
| | - Shiro Suzuki
- a Research Institute for Sustainable Humanosphere, Kyoto University , Uji, Kyoto , Japan
| | - Miho Kojima
- b Graduate School of Agriculture , Kyoto University , Kyoto , Japan
| | - Keiji Takabe
- b Graduate School of Agriculture , Kyoto University , Kyoto , Japan
| | - Yoshifumi Terajima
- c Tropical Agricultural Research Front, Japan International Research Center for Agricultural Sciences , Ishigaki , Japan
| | - Asako Mihashi
- d Tsukuba Laboratory , AIST Tsukuba Central 6, Japan Bioindustry Association , Tsukuba , Japan
| | - Yoshinori Kobayashi
- d Tsukuba Laboratory , AIST Tsukuba Central 6, Japan Bioindustry Association , Tsukuba , Japan
| | - Toshiaki Umezawa
- a Research Institute for Sustainable Humanosphere, Kyoto University , Uji, Kyoto , Japan.,e Research Unit for Development of Global Sustainability , Kyoto University , Uji, Kyoto , Japan
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Wu X, Huang C, Zhai S, Liang C, Huang C, Lai C, Yong Q. Improving enzymatic hydrolysis efficiency of wheat straw through sequential autohydrolysis and alkaline post-extraction. BIORESOURCE TECHNOLOGY 2018; 251:374-380. [PMID: 29294459 DOI: 10.1016/j.biortech.2017.12.066] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 12/19/2017] [Accepted: 12/20/2017] [Indexed: 06/07/2023]
Abstract
In this work, a two-step pretreatment process of wheat straw was established by combining autohydrolysis pretreatment and alkaline post-extraction. The results showed that employing alkaline post-extraction to autohydrolyzed wheat straw could significantly improve its enzymatic hydrolysis efficiency from 36.0% to 83.7%. Alkaline post-extraction lead to the changes of the structure characteristics of autohydrolyzed wheat straw. Associations between enzymatic hydrolysis efficiency and structure characteristics were also studied. The results showed that the factors of structure characteristics such as delignification, xylan removal yield, crystallinity, accessibility and hydrophobicity are positively related to enzymatic hydrolysis efficiency within a certain range for alkaline post-extracted wheat straw. The results demonstrated that autohydrolysis coupled with alkaline post-extraction is an effective and promising method to gain fermentable sugars from biomass.
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Affiliation(s)
- Xinxing Wu
- Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Chen Huang
- Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Shengcheng Zhai
- Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; Materials Science & Engineering College, Nanjing Forestry University, Nanjing 210037, China
| | - Chen Liang
- Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, China
| | - Caoxing Huang
- Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, China; College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Chenhuan Lai
- Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Qiang Yong
- Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
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Li YH, Zhang XY, Zhang F, Peng LC, Zhang DB, Kondo A, Bai FW, Zhao XQ. Optimization of cellulolytic enzyme components through engineering Trichoderma reesei and on-site fermentation using the soluble inducer for cellulosic ethanol production from corn stover. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:49. [PMID: 29483942 PMCID: PMC5824536 DOI: 10.1186/s13068-018-1048-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 02/12/2018] [Indexed: 05/05/2023]
Abstract
BACKGROUND Cellulolytic enzymes produced by Trichoderma reesei are widely studied for biomass bioconversion, and enzymatic components vary depending on different inducers. In our previous studies, a mixture of glucose and disaccharide (MGD) was developed and used to induce cellulase production. However, the enzymatic profile induced by MGD is still not defined, and further optimization of the enzyme cocktail is also required for efficient ethanol production from lignocellulosic biomass. RESULTS In this study, cellulolytic enzymes produced by T. reesei Rut C30 using MGD and alkali-pretreated corn stover (APCS) as inducer were compared. Cellular secretome in response to each inducer was analyzed, which revealed a similar enzyme profile. However, significant difference in the content of cellulases and xylanase was detected. Although MGD induction enhanced β-glucosidase production, its activity was still not sufficient for biomass hydrolysis. To overcome such a disadvantage, aabgl1 encoding β-glucosidase in Aspergillus aculeatus was heterologously expressed in T. reesei Rut C30 under the control of the pdc1 promoter. The recombinant T. reesei PB-3 strain showed an improved β-glucosidase activity of 310 CBU/mL in the fed-batch fermentation, 71-folds higher than that produced by the parent strain. Meanwhile, cellulase activity of 50 FPU/mL was detected. Subsequently, the crude enzyme was applied for hydrolyzing corn stover with a solid loading of 20% through separate hydrolysis and fermentation (SHF) and simultaneous saccharification and fermentation, respectively, for ethanol production. Better performance was observed in the SHF process, through which a total of 119.9 g/L glucose was released within 12 h for concomitant ethanol production of 54.2 g/L. CONCLUSIONS The similar profile of cellulolytic enzymes was detected under the induction of MGD and APCS, but higher amount of cellulases was present in the crude enzyme induced by MGD. However, β-glucosidase activity induced by MGD was not sufficient for hydrolyzing lignocellulosic biomass. High titers of cellulases and β-glucosidase were achieved simultaneously by heterologous expression of aabgl1 in T. reesei and fed-batch fermentation through feeding MGD. We demonstrated that on-site cellulase production by T. reesei PB-3 has a potential for efficient biomass saccharification and ethanol production from lignocellulosic biomass.
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Affiliation(s)
- Yong-Hao Li
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
- Present Address: School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, 401331 China
| | - Xiao-Yue Zhang
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116023 China
| | - Fei Zhang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
| | - Liang-Cai Peng
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
| | - Da-Bing Zhang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
| | - Akihiko Kondo
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Kobe, 657-8501 Japan
| | - Feng-Wu Bai
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
| | - Xin-Qing Zhao
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 China
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Wang Q, Chen L, Yu D, Lin H, Shen Q, Zhao Y. Excellent waste biomass-degrading performance of Trichoderma asperellum T-1 during submerged fermentation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 609:1329-1339. [PMID: 28793402 DOI: 10.1016/j.scitotenv.2017.07.212] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 07/23/2017] [Accepted: 07/23/2017] [Indexed: 06/07/2023]
Abstract
The random disposal and incineration of agricultural residues cause resources waste and environmental pollution. The potential of waste biomass for the production of alternative liquid fuels is increasing and the bioconversion of lignocellulose to fermentable monomeric sugars is essential for second-generation biofuel production. Here, natural and pretreated switch grass or rice straw were fermented by both Trichoderma asperellum T-1 and Trichoderma reesei QM6a, with the fermentation results highlighted the potential of T. asperellum T-1 in the degradation of natural waste lignocellulosic materials. In fermenting different substrates, the filter paper activity, β-glucosidase activity, xylanase activity and carboxymethyl cellulase activity of T-1 can respectively reach 1.88, 8.00, 7.15 and 20.52 times that of QM6a. Although acid pretreatment could improve the enzyme activities of both T-1 and QM6a, its effect on T-1 was much smaller than that on QM6a. Moreover, strain T-1 fermented the natural rice straw better than the pretreated rice straw. Therefore, T-1 is considered to be more suitable for the degradation of natural biomass, especially for the degradation of rice straw. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and scanning electron microscopy (SEM) showed that the cellulase series secreted by T. asperellum T-1 was more abundant, and its substrate deconstruction ability was stronger than T. reesei QM6a. All these results suggest the potential of T. asperellum T-1 in the degradation of natural waste lignocellulosic material, with practical benefits in terms of cost and pollution reduction.
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Affiliation(s)
- Qun Wang
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou 310058, China; Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province, Research Institute of Eco-environmental Science, Zhejiang University of Science and Technology, Hangzhou 310023, China
| | - Liang Chen
- Zhejiang Gongshang University, Hangzhou 310018, China
| | - Daobing Yu
- School of Forestry and Biotechnology, Zhejiang Agriculture and Forestry University, Lin'an 311300, China
| | - Hui Lin
- Institute of Environment Resource and Soil Fertilizer, Zhejiang Academy of Agriculture Science, Hangzhou 310021, China
| | - Qi Shen
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuhua Zhao
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou 310058, China.
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Lai C, Tang S, Yang B, Gao Z, Li X, Yong Q. Enhanced enzymatic saccharification of corn stover by in situ modification of lignin with poly (ethylene glycol) ether during low temperature alkali pretreatment. BIORESOURCE TECHNOLOGY 2017; 244:92-99. [PMID: 28779679 DOI: 10.1016/j.biortech.2017.07.074] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 07/13/2017] [Accepted: 07/14/2017] [Indexed: 06/07/2023]
Abstract
A novel pretreatment process of corn stover was established in this study by in situ modification of lignin with poly (ethylene glycol) diglycidyl ether (PEGDE) during low temperature alkali pretreatment. The addition of PEGDE obviously improved the enzymatic hydrolysis by covalently modifying the residual lignins in substrates. Under the optimized conditions (pretreated with 10% (w/w) NaOH and 10% (w/w) PEGDE at 70°C for 2.5h), the total fermentable sugar yield was increased by 46.4%, from 23.7g to 34.7g per 100g raw materials. Additionally, the remaining activities of exo-glucanase and β-glucosidase in supernatant were increased by 58.6% and 40.6% respectively, demonstrating that the enhancement of enzymatic hydrolysis was mainly due to the alleviation of enzyme non-productive binding. Although the isolated lignin modified with PEGDE enhanced the enzymatic hydrolysis of substrates as well, this in situ lignin modification provided an efficient but simple way to improve enzymatic saccharification.
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Affiliation(s)
- Chenhuan Lai
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Shuo Tang
- College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Bo Yang
- College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Ziqi Gao
- College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Xin Li
- College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China; Key Laboratory of Forest Genetics & Biotechnology of the Ministry of Education, Nanjing 210037, China
| | - Qiang Yong
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China; College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
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The utilization of sweet potato vines as carbon sources for fermenting bio-butanol. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.02.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Abstract
The global push toward an efficient and economical biobased economy has driven research to develop more cost-effective applications for the entirety of plant biomass, including lignocellulosic crops. As discussed elsewhere (Karlsson M, Atanasova L, Funck Jensen D, Zeilinger S, in Heitman J et al. [ed], Tuberculosis and the Tubercle Bacillus, 2nd ed, in press), significant progress has been made in the use of polysaccharide fractions from lignocellulose, cellulose, and various hemicellulose types. However, developing processes for use of the lignin fraction has been more challenging. In this chapter, we discuss characteristics of lignolytic enzymes and the fungi that produce them as well as potential and current uses of lignin-derived products.
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Croat JR, Karki B, Berhow M, Iten L, Muthukumarappan K, Gibbons WR. Utilizing pretreatment and fungal incubation to enhance the nutritional value of canola meal. J Appl Microbiol 2017; 123:362-371. [PMID: 28703403 DOI: 10.1111/jam.13507] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 05/12/2017] [Accepted: 06/04/2017] [Indexed: 11/26/2022]
Abstract
AIMS The objective of this study was to determine the optimal pretreatment and fungal strain to reduce glucosinolates (GLS), fibre and residual sugars while increasing the nutritional value of canola meal. METHODS AND RESULTS Submerged incubation conditions were used to evaluate four pretreatment methods (extrusion, hot water cook, dilute acid and dilute alkali) and three fungal cultures (Aureobasidium pullulans Y-2311-1, Fusarium venenatum NRRL-26139 and Trichoderma reesei NRRL-3653) in hexane-extracted (HE) and cold-pressed (CP) canola meal. CONCLUSIONS The combination of extrusion pretreatment followed by incubation with T. reesei resulted in the greatest overall improvement to HE canola meal, increasing protein to 51·5%, while reducing NDF, GLS and residual sugars to 18·6%, 17·2 μmol l-1 g-1 and 5% w/w, respectively. Extrusion pretreatment and incubation with F. venenatum performed the best with CP canola meal, resulting in 54·4% protein while reducing NDF, GLS and residual sugars to 11·6%, 6·7 μmol l-1 g-1 and 3·8% w/w respectively. SIGNIFICANCE AND IMPACT OF THE STUDY The work is significant in that it provides a method of reducing GLS (up to 98%) and neutral detergent fibre (up to 65%) while increasing the protein content (up to 45%) of canola meal. This novel pretreatment and submerged incubation process could be used to produce a canola product with higher nutritional value for livestock consumption.
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Affiliation(s)
- J R Croat
- Biology & Microbiology Department, South Dakota State University, Brookings, SD, USA
| | - B Karki
- Agricultural & Biosystems Engineering Department, South Dakota State University, Brookings, SD, USA
| | - M Berhow
- USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, Peoria, IL, USA
| | - L Iten
- USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, Peoria, IL, USA
| | - K Muthukumarappan
- Agricultural & Biosystems Engineering Department, South Dakota State University, Brookings, SD, USA
| | - W R Gibbons
- Biology & Microbiology Department, South Dakota State University, Brookings, SD, USA
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Abstract
This study investigated the effects of two soil moisture levels (SM) (30% and 70% soil available water) and three harvests (90 days, 118 days, and 151 days after seeding) on sweet (S506) and fiber (B133) sorghum genotypes under rain-sheltered conditions. Juice and bagasse-derived ethanol and their sum (EtOHBJ, EtOHB, and EtOHJ+B, respectively) were assessed. Water use efficiency (WUE) was determined for sorghum dry weight (DW) and EtOHJ+B. S506 had similar DW, but higher sugar content than B133, resulting in higher EtOHJ (+32%) and EtOHJ+B (+9%). High SM-enhanced DW, juice and sugars content, determining a strong EtOHJ+B increase (+99% vs. low SM). Late harvest enhanced DW and EtOHJ+B (+107% vs. early harvest), despite decreasing extractives and increasing structural fiber components. Water use efficiency of EtOHJ+B improved with high vs. low SM, although differences faded in late harvest. Upscale of EtOHJ+B and WUE data indicated a range of 21,000–82,000 ha of sorghum cultivation and 60–117 Mm3 of irrigation water, as amounts of resources needed to supply an 85,000 m3·yr−1 bio-ethanol plant. This large variation in land and water needs depended on specific combinations between crop factors SM and harvests.
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Kumar AK, Sharma S. Recent updates on different methods of pretreatment of lignocellulosic feedstocks: a review. BIORESOUR BIOPROCESS 2017; 4:7. [PMID: 28163994 PMCID: PMC5241333 DOI: 10.1186/s40643-017-0137-9] [Citation(s) in RCA: 338] [Impact Index Per Article: 48.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 01/10/2017] [Indexed: 11/22/2022] Open
Abstract
Lignocellulosic feedstock materials are the most abundant renewable bioresource material available on earth. It is primarily composed of cellulose, hemicellulose, and lignin, which are strongly associated with each other. Pretreatment processes are mainly involved in effective separation of these complex interlinked fractions and increase the accessibility of each individual component, thereby becoming an essential step in a broad range of applications particularly for biomass valorization. However, a major hurdle is the removal of sturdy and rugged lignin component which is highly resistant to solubilization and is also a major inhibitor for hydrolysis of cellulose and hemicellulose. Moreover, other factors such as lignin content, crystalline, and rigid nature of cellulose, production of post-pretreatment inhibitory products and size of feed stock particle limit the digestibility of lignocellulosic biomass. This has led to extensive research in the development of various pretreatment processes. The major pretreatment methods include physical, chemical, and biological approaches. The selection of pretreatment process depends exclusively on the application. As compared to the conventional single pretreatment process, integrated processes combining two or more pretreatment techniques is beneficial in reducing the number of process operational steps besides minimizing the production of undesirable inhibitors. However, an extensive research is still required for the development of new and more efficient pretreatment processes for lignocellulosic feedstocks yielding promising results.
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Affiliation(s)
- Adepu Kiran Kumar
- Bioconversion Technology Division, Sardar Patel Renewable Energy Research Institute, Vallabh Vidyanagar, Anand, 388 120 Gujarat India
| | - Shaishav Sharma
- Bioconversion Technology Division, Sardar Patel Renewable Energy Research Institute, Vallabh Vidyanagar, Anand, 388 120 Gujarat India
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Sustainable Production of Chemicals and Energy Fuel Precursors from Lignocellulosic Fractions. BIOFUELS 2017. [DOI: 10.1007/978-981-10-3791-7_2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Wang X, Guo Y, Zhou J, Sun G. Structural changes of poplar wood lignin after supercritical pretreatment using carbon dioxide and ethanol–water as co-solvents. RSC Adv 2017. [DOI: 10.1039/c6ra26122a] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
To delineate structural changes of lignin after SCEP, enzymatic hydrolysis lignin (EHL) in poplar chips, lignin in pretreated residues (SCEP-RL), lignin in liquors (SCEP-DL) were isolated and analyzed by GPC, 13C-, 31P-, 2D-HSQC-NMR and TGA.
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Affiliation(s)
- Xing Wang
- Liaoning Key Laboratory of Pulp and Papermaking Engineering
- Dalian Polytechnic University
- Dalian
- China
| | - Yanzhu Guo
- Liaoning Key Laboratory of Pulp and Papermaking Engineering
- Dalian Polytechnic University
- Dalian
- China
| | - Jinghui Zhou
- Liaoning Key Laboratory of Pulp and Papermaking Engineering
- Dalian Polytechnic University
- Dalian
- China
| | - Guangwei Sun
- Liaoning Key Laboratory of Pulp and Papermaking Engineering
- Dalian Polytechnic University
- Dalian
- China
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