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Branska B, Koppova K, Husakova M, Patakova P. Application of fed-batch strategy to fully eliminate the negative effect of lignocellulose-derived inhibitors in ABE fermentation. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2024; 17:87. [PMID: 38915101 PMCID: PMC11197323 DOI: 10.1186/s13068-024-02520-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Accepted: 05/16/2024] [Indexed: 06/26/2024]
Abstract
BACKGROUND Inhibitors that are released from lignocellulose biomass during its treatment represent one of the major bottlenecks hindering its massive utilization in the biotechnological production of chemicals. This study demonstrates that negative effect of inhibitors can be mitigated by proper feeding strategy. Both, crude undetoxified lignocellulose hydrolysate and complex medium supplemented with corresponding inhibitors were tested in acetone-butanol-ethanol (ABE) fermentation using Clostridium beijerinckii NRRL B-598 as the producer strain. RESULTS First, it was found that the sensitivity of C. beijerinckii to inhibitors varied with different growth stages, being the most significant during the early acidogenic phase and less pronounced during late acidogenesis and early solventogenesis. Thus, a fed-batch regime with three feeding schemes was tested for toxic hydrolysate (no growth in batch mode was observed). The best results were obtained when the feeding of an otherwise toxic hydrolysate was initiated close to the metabolic switch, resulting in stable and high ABE production. Complete utilization of glucose, and up to 88% of xylose, were obtained. The most abundant inhibitors present in the alkaline wheat straw hydrolysate were ferulic and coumaric acids; both phenolic acids were efficiently detoxified by the intrinsic metabolic activity of clostridia during the early stages of cultivation as well as during the feeding period, thus preventing their accumulation. Finally, the best feeding strategy was verified using a TYA culture medium supplemented with both inhibitors, resulting in 500% increase in butanol titer over control batch cultivation in which inhibitors were added prior to inoculation. CONCLUSION Properly timed sequential feeding effectively prevented acid-crash and enabled utilization of otherwise toxic substrate. This study unequivocally demonstrates that an appropriate biotechnological process control strategy can fully eliminate the negative effects of lignocellulose-derived inhibitors.
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Affiliation(s)
- Barbora Branska
- Department of Biotechnology, University of Chemistry and Technology Prague, Technická 5, 16628, Prague, Czech Republic.
| | - Kamila Koppova
- Department of Biotechnology, University of Chemistry and Technology Prague, Technická 5, 16628, Prague, Czech Republic
| | - Marketa Husakova
- Department of Biotechnology, University of Chemistry and Technology Prague, Technická 5, 16628, Prague, Czech Republic
| | - Petra Patakova
- Department of Biotechnology, University of Chemistry and Technology Prague, Technická 5, 16628, Prague, Czech Republic
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Nabila DS, Chan R, Syamsuri RRP, Nurlilasari P, Wan-Mohtar WAAQI, Ozturk AB, Rossiana N, Doni F. Biobutanol production from underutilized substrates using Clostridium: Unlocking untapped potential for sustainable energy development. CURRENT RESEARCH IN MICROBIAL SCIENCES 2024; 7:100250. [PMID: 38974669 PMCID: PMC11225672 DOI: 10.1016/j.crmicr.2024.100250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/09/2024] Open
Abstract
The increasing demand for sustainable energy has brought biobutanol as a potential substitute for fossil fuels. The Clostridium genus is deemed essential for biobutanol synthesis due to its capability to utilize various substrates. However, challenges in maintaining fermentation continuity and achieving commercialization persist due to existing barriers, including butanol toxicity to Clostridium, low substrate utilization rates, and high production costs. Proper substrate selection significantly impacts fermentation efficiency, final product quality, and economic feasibility in Clostridium biobutanol production. This review examines underutilized substrates for biobutanol production by Clostridium, which offer opportunities for environmental sustainability and a green economy. Extensive research on Clostridium, focusing on strain development and genetic engineering, is essential to enhance biobutanol production. Additionally, critical suggestions for optimizing substrate selection to enhance Clostridium biobutanol production efficiency are also provided in this review. In the future, cost reduction and advancements in biotechnology may make biobutanol a viable alternative to fossil fuels.
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Affiliation(s)
- Devina Syifa Nabila
- Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor, West Java 45363, Indonesia
| | - Rosamond Chan
- Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor, West Java 45363, Indonesia
| | | | - Puspita Nurlilasari
- Department of Agro-industrial Technology, Faculty of Agro-industrial Technology, Universitas Padjadjaran, Jatinangor, West Java 45363, Indonesia
| | - Wan Abd Al Qadr Imad Wan-Mohtar
- Functional Omics and Bioprocess Development Laboratory, Institute of Biological Sciences, Faculty of Science, Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | - Abdullah Bilal Ozturk
- Department of Chemical Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Esenler, Istanbul 34220, Türkiye
| | - Nia Rossiana
- Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor, West Java 45363, Indonesia
| | - Febri Doni
- Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jatinangor, West Java 45363, Indonesia
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Zhang X, Nijland JG, Driessen AJM. Maltose accumulation-induced cell death in Saccharomyces cerevisiae. FEMS Yeast Res 2024; 24:foae012. [PMID: 38565313 PMCID: PMC11037483 DOI: 10.1093/femsyr/foae012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 03/12/2024] [Accepted: 04/01/2024] [Indexed: 04/04/2024] Open
Abstract
Pretreatment of lignocellulose yields a complex sugar mixture that potentially can be converted into bioethanol and other chemicals by engineered yeast. One approach to overcome competition between sugars for uptake and metabolism is the use of a consortium of specialist strains capable of efficient conversion of single sugars. Here, we show that maltose inhibits cell growth of a xylose-fermenting specialist strain IMX730.1 that is unable to utilize glucose because of the deletion of all hexokinase genes. The growth inhibition cannot be attributed to a competition between maltose and xylose for uptake. The inhibition is enhanced in a strain lacking maltase enzymes (dMalX2) and completely eliminated when all maltose transporters are deleted. High-level accumulation of maltose in the dMalX2 strain is accompanied by a hypotonic-like transcriptional response, while cells are rescued from maltose-induced cell death by the inclusion of an extracellular osmolyte such as sorbitol. These data suggest that maltose-induced cell death is due to high levels of maltose uptake causing hypotonic-like stress conditions and can be prevented through engineering of the maltose transporters. Transporter engineering should be included in the development of stable microbial consortia for the efficient conversion of lignocellulosic feedstocks.
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Affiliation(s)
- Xiaohuan Zhang
- Molecular Microbiology, Groningen Biomolecular Sciences and Biotechnology, University of Groningen, Nijenborgh 7, 9747AG Groningen, the Netherlands
| | - Jeroen G Nijland
- Molecular Microbiology, Groningen Biomolecular Sciences and Biotechnology, University of Groningen, Nijenborgh 7, 9747AG Groningen, the Netherlands
| | - Arnold J M Driessen
- Molecular Microbiology, Groningen Biomolecular Sciences and Biotechnology, University of Groningen, Nijenborgh 7, 9747AG Groningen, the Netherlands
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Tigunova O, Bratishko V, Shulga S. Apple pomace as an alternative substrate for butanol production. AMB Express 2023; 13:138. [PMID: 38055129 DOI: 10.1186/s13568-023-01649-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 11/26/2023] [Indexed: 12/07/2023] Open
Abstract
Butanol-producing strains Clostridium sp. UCM B-7570 and C. acetobutylicum UCM B-7407 were used for research from "Collection of strains of microorganisms and plant lines for food and agricultural biotechnology" of the Institute of Food Biotechnology and Genomics of the National Academy of Sciences of Ukraine, glycerol (BASF, Germany) and apple pomace (total moisture 4%) after apple juice production. The aim of this work was to study the possibility of using apple pomace by domestic butanol-producing strains of Clostridium sp. UCM B-7570 and C. acetobutylicum UCM B-7407 as a substrate. Producers were cultured on medium with different concentrations of apple pomace, glycerol was used for the inoculation. The presence of ethanol, acetone, and butanol in the culture liquid was determined using a gas chromatograph. It was determined that a significant part of the macrocomponent composition of the extracts can be used in bioconversion by producing strains of the genus Clostridium. It was determined that the highest concentration of butanol (10 g/dm3) was at a concentration of 120 g/dm3 in the extracts. The obtained data showed the possibility of using apple pomace as a substrate in biobutanol technology.
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Affiliation(s)
- Olena Tigunova
- Institute of Food Biotechnology and Genomics NAS of Ukraine, Laboratory of Food and Industrial Biotechnology, 2a, Baida Vyshnevetskyi Str, Kyiv, 04123, Ukraine.
| | - Viacheslav Bratishko
- National University of Life and Environmental Science of Ukraine, 15, Heroes Oborony str, Kyiv, 03041, Ukraine
| | - Sergiy Shulga
- Institute of Food Biotechnology and Genomics NAS of Ukraine, Laboratory of Food and Industrial Biotechnology, 2a, Baida Vyshnevetskyi Str, Kyiv, 04123, Ukraine
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Xu J, Li H, Alam MA, Muhammad G, Lv Y, Zhao A, Zhang S, Xiong W. Employing Cationic Kraft Lignin as Additive to Enhance Enzymatic Hydrolysis of Corn Stalk. Polymers (Basel) 2023; 15:polym15091991. [PMID: 37177139 PMCID: PMC10180774 DOI: 10.3390/polym15091991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 04/10/2023] [Accepted: 04/18/2023] [Indexed: 05/15/2023] Open
Abstract
A water-soluble cationic kraft lignin (named JLQKL50), synthesized by combining quaternization and crosslinking reactions, was used as an additive to enhance the enzymatic hydrolysis of dilute-alkali-pretreated corn stalk. The chemical constitution of JLQKL50 was investigated by Fourier transform infrared spectroscopy, 1H nuclear magnetic resonance (NMR) and 13C NMR spectroscopy, and elemental analysis. The enzymatic hydrolysis efficiency of corn stalk at solid content of 10% (w/v) was significantly improved from 70.67% to 78.88% after 24 h when JLQKL50 was added at a concentration of 2 g/L. Meanwhile, the enzymatic hydrolysis efficiency after 72 h reached 91.11% with 10 FPU/g of cellulase and 97.92% with 15 FPU/g of cellulase. In addition, JLQKL50 was found capable of extending the pH and temperature ranges of enzymatic hydrolysis to maintain high efficiency (higher than 70%). The decrease in cellulase activity under vigorous stirring with the addition of JLQKL50 was 17.4%, which was much lower than that (29.7%) without JLQKL50. The addition of JLQKL50 reduced the nonproductive adsorption of cellulase on the lignin substrate and improved the longevity, dispersity, and stability of the cellulase by enabling electrostatic repulsion. Therefore, the enzymatic hydrolysis of the corn stalk was enhanced. This study paves the way for the design of sustainable lignin-based additives to boost the enzymatic hydrolysis of lignocellulosic biomass.
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Affiliation(s)
- Jingliang Xu
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
- Henan Center for Outstanding Overseas Scientists, Zhengzhou 450001, China
| | - Huihua Li
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Md Asraful Alam
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Gul Muhammad
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Yongkun Lv
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Anqi Zhao
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China
| | - Shen Zhang
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Wenlong Xiong
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
- Henan Center for Outstanding Overseas Scientists, Zhengzhou 450001, China
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Sartaj K, Patel A, Matsakas L, Prasad R. Unravelling Metagenomics Approach for Microbial Biofuel Production. Genes (Basel) 2022; 13:1942. [PMID: 36360179 PMCID: PMC9689425 DOI: 10.3390/genes13111942] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 10/18/2022] [Accepted: 10/21/2022] [Indexed: 09/29/2023] Open
Abstract
Renewable biofuels, such as biodiesel, bioethanol, and biobutanol, serve as long-term solutions to fossil fuel depletion. A sustainable approach feedstock for their production is plant biomass, which is degraded to sugars with the aid of microbes-derived enzymes, followed by microbial conversion of those sugars to biofuels. Considering their global demand, additional efforts have been made for their large-scale production, which is ultimately leading breakthrough research in biomass energy. Metagenomics is a powerful tool allowing for functional gene analysis and new enzyme discovery. Thus, the present article summarizes the revolutionary advances of metagenomics in the biofuel industry and enlightens the importance of unexplored habitats for novel gene or enzyme mining. Moreover, it also accentuates metagenomics potentials to explore uncultivable microbiomes as well as enzymes associated with them.
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Affiliation(s)
- Km Sartaj
- Department of Biosciences and Bioengineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
| | - Alok Patel
- Biochemical Process Engineering, Division of Chemical Engineering, Department of Civil, Environmental, and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
| | - Leonidas Matsakas
- Biochemical Process Engineering, Division of Chemical Engineering, Department of Civil, Environmental, and Natural Resources Engineering, Luleå University of Technology, SE-971 87 Luleå, Sweden
| | - Ramasare Prasad
- Department of Biosciences and Bioengineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
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