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Cho DH, Kim HJ, Oh SJ, Hwang JH, Shin N, Bhatia SK, Yoon JJ, Jeon JM, Yang YH. Strategy for efficiently utilizing Escherichia coli cells producing isobutanol by combining isobutanol and indigo production systems. J Biotechnol 2023; 367:62-70. [PMID: 37019156 DOI: 10.1016/j.jbiotec.2023.03.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 03/30/2023] [Accepted: 03/31/2023] [Indexed: 04/05/2023]
Abstract
Isobutanol is a potential biofuel, and its microbial production systems have demonstrated promising results. In a microbial system, the isobutanol produced is secreted into the media; however, the cells remaining after fermentation cannot be used efficiently during the isobutanol recovery process and are discarded as waste. To address this, we aimed to investigate the strategy of utilizing these remaining cells by combining the isobutanol production system with the indigo production system, wherein the product accumulates intracellularly. Accordingly, we constructed E. coli systems with genes, such as acetolactate synthase gene (alsS), ketol-acid reductoisomerase gene (ilvC), dihydroxyl-acid dehydratase (ilvD), and alpha-ketoisovalerate decarboxylase gene (kivD), for isobutanol production and genes, such as tryptophanase gene (tnaA) and flavin-containing monooxygenase gene (FMO), for indigo production. This system produced isobutanol and indigo simultaneously while accumulating indigo within cells. The production of isobutanol and indigo exhibited a strong linear correlation up to 72 h of production time; however, the pattern of isobutanol and indigo production varied. To our knowledge, this study is the first to simultaneously produce isobutanol and indigo and can potentially enhance the economy of biochemical production.
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Affiliation(s)
- Do Hyun Cho
- Department of Biological Engineering, College of Engineering, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Hyun Jin Kim
- Department of Biological Engineering, College of Engineering, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Suk Jin Oh
- Department of Biological Engineering, College of Engineering, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Jeong Hyeon Hwang
- Department of Biological Engineering, College of Engineering, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Nara Shin
- Department of Biological Engineering, College of Engineering, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Shashi Kant Bhatia
- Department of Biological Engineering, College of Engineering, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea; Institute for Ubiquitous Information Technology and Applications, Konkuk University, Seoul, South Korea
| | - Jeong-Jun Yoon
- Green & Sustainable Materials R&D Department, Korea Institute of Industrial Technology (KITECH), Cheonan, Republic of Korea
| | - Jong-Min Jeon
- Green & Sustainable Materials R&D Department, Korea Institute of Industrial Technology (KITECH), Cheonan, Republic of Korea.
| | - Yung-Hun Yang
- Department of Biological Engineering, College of Engineering, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea; Institute for Ubiquitous Information Technology and Applications, Konkuk University, Seoul, South Korea.
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Demirel F, Germec M, Turhan I. Fermentable sugars production from wheat bran and rye bran: response surface model optimization of dilute sulfuric acid hydrolysis. ENVIRONMENTAL TECHNOLOGY 2022; 43:3779-3800. [PMID: 34029158 DOI: 10.1080/09593330.2021.1934563] [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: 03/18/2021] [Accepted: 05/17/2021] [Indexed: 06/12/2023]
Abstract
ABSTRACTOptimization of hydrolysis conditions of lignocellulosic biomass is crucial to able to produce value-added products by fermentation. This study not only determines optimal dilute sulfuric acid (H2SO4) hydrolysis conditions of wheat bran (WB) and rye bran (RB) by using one-factor-at-a-time method and subsequently Box-Behnken design but also elucidates chemical composition of hydrolysates yielded under optimal hydrolysis conditions. Based on the results, optimal hydrolysis conditions of WB and RB were 121 and 130°C of temperature, 1/8 and 1/8 w/v of solid to liquid ratio, 2.66 and 1.58% v/v of dilute H2SO4 ratio, and 30 and 16 min of implementation time, respectively. Hydrolysates obtained from WB and RB at these conditions contained 72.7 (0.58 g sugar/g biomass) and 89.4 g/L (0.72 g sugar/g biomass) of reducing sugar concentration, respectively. Hydrolysis rates of WB and RB were 87.79 and 91.33%, respectively. Main reducing sugar in RB hydrolysate was glucose with 31.17 g/L (0.25 g glucose/g biomass) while glucose and xylose were the main monosaccharides with 20.90 (0.17 g glucose/g biomass) and 18.69 g/L (0.15 g xylose/g biomass) in WB hydrolysate, respectively. With acidic hydrolysis of WB and RB, inhibitors such as phenolics, 5-Hydroxymethylfurfural, 2-Furaldehyde (not for RB), acetic acid, and formic acid (not for WB) formed. Catalytic efficiency values of H2SO4 for WB and RB were 15.2 and 24.4 g /g, respectively, indicating that inhibitor concentration in WB hydrolysate was higher than that of RB. These results indicated that WB and RB have a high potential in production of value-added products by fermentation.
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Affiliation(s)
- Fadime Demirel
- Department of Food Engineering, Akdeniz University, Antalya, Turkey
| | - Mustafa Germec
- Department of Food Engineering, Akdeniz University, Antalya, Turkey
| | - Irfan Turhan
- Department of Food Engineering, Akdeniz University, Antalya, Turkey
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Bellido C, Lucas S, González-Benito G, García-Cubero MT, Coca M. Synergistic positive effect of organic acids on the inhibitory effect of phenolic compounds on Acetone-Butanol-Ethanol (ABE) production. FOOD AND BIOPRODUCTS PROCESSING 2018. [DOI: 10.1016/j.fbp.2018.02.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Affiliation(s)
- Tao Jin
- Iowa State University; Department of Chemical and Biological Engineering; 2114 Sweeney Hall, 618 Bissell Rd. Ames, IA 50011 USA
| | - Jieni Lian
- Iowa State University; Department of Chemical and Biological Engineering; 2114 Sweeney Hall, 618 Bissell Rd. Ames, IA 50011 USA
| | - Laura R. Jarboe
- Iowa State University; Department of Chemical and Biological Engineering; 2114 Sweeney Hall, 618 Bissell Rd. Ames, IA 50011 USA
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Increasing isobutanol yield by double-gene deletion of PDC6 and LPD1 in Saccharomyces cerevisiae. Chin J Chem Eng 2016. [DOI: 10.1016/j.cjche.2016.04.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Nichols NN, Saha BC. Production of xylitol by aConiochaeta ligniariastrain tolerant of inhibitors and defective in growth on xylose. Biotechnol Prog 2016; 32:606-12. [DOI: 10.1002/btpr.2259] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 03/03/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Nancy N. Nichols
- Bioenergy Research Unit, National Center for Agricultural Utilization Research, USDA-ARS; Peoria IL
| | - Badal C. Saha
- Bioenergy Research Unit, National Center for Agricultural Utilization Research, USDA-ARS; Peoria IL
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Germec M, Kartal FK, Bilgic M, Ilgin M, Ilhan E, Güldali H, Isci A, Turhan I. Ethanol production from rice hull usingPichia stipitisand optimization of acid pretreatment and detoxification processes. Biotechnol Prog 2016; 32:872-82. [DOI: 10.1002/btpr.2275] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 03/30/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Mustafa Germec
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
- Dept. of Food Engineering; Cankiri Karatekin University; Cankiri 18100 Turkey
| | | | - Merve Bilgic
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
| | - Merve Ilgin
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
| | - Eda Ilhan
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
| | - Hazal Güldali
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
| | - Aslı Isci
- Dept. of Food Engineering; Ankara University; Ankara 06800 Turkey
| | - Irfan Turhan
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
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Germec M, Tarhan K, Yatmaz E, Tetik N, Karhan M, Demirci A, Turhan I. Ultrasound-assisted dilute acid hydrolysis of tea processing waste for production of fermentable sugar. Biotechnol Prog 2016; 32:393-403. [DOI: 10.1002/btpr.2225] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 12/04/2015] [Indexed: 12/20/2022]
Affiliation(s)
- Mustafa Germec
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
- Dept. of Food Engineering; Cankiri Karatekin University; Cankiri 18100 Turkey
| | - Kübra Tarhan
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
| | - Ercan Yatmaz
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
| | - Nedim Tetik
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
| | - Mustafa Karhan
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
| | - Ali Demirci
- Dept. of Agricultural and Biological Engineering; The Pennsylvania State University, University Park; PA
| | - Irfan Turhan
- Dept. of Food Engineering; Akdeniz University; Antalya 07058 Turkey
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Li HG, Zhang QH, Yu XB, Wei L, Wang Q. Enhancement of butanol production in Clostridium acetobutylicum SE25 through accelerating phase shift by different phases pH regulation from cassava flour. BIORESOURCE TECHNOLOGY 2016; 201:148-155. [PMID: 26642220 DOI: 10.1016/j.biortech.2015.11.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Revised: 11/11/2015] [Accepted: 11/12/2015] [Indexed: 06/05/2023]
Abstract
A prominent delay with 12h was encountered in the phase shift from acidogenesis to solventogenesis in butanol production when the substrate-glucose was replaced by cassava flour. To solve this problem, different phase of pH regulation strategies were performed to shorten this delay time. With this effort, the phase shift occurred smoothly and the fermentation time was shortened. Under the optimal conditions, 16.24g/L butanol and 72h fermentation time were achieved, which were 25.3% higher and 14.3% shorter than those in the case of without pH regulation. Additionally, the effect of CaCO3 on "acid crash" and butanol production was also investigated. It was found that organic acids reassimilation would be of benefit to enhance butanol production. These results indicated that the simple but effective approach for acceleration of phase shift is a promising technique for shortening the fermentation time and improvement of butanol production.
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Affiliation(s)
- Han-guang Li
- College of Bioscience and Engineering, Jiangxi Agricultural University, Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources, Nanchang 330045, China; The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Qing-hua Zhang
- College of Bioscience and Engineering, Jiangxi Agricultural University, Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources, Nanchang 330045, China.
| | - Xiao-bin Yu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Luo Wei
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Qiang Wang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
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Grimaldi J, Collins CH, Belfort G. Towards cell-free isobutanol production: Development of a novel immobilized enzyme system. Biotechnol Prog 2015; 32:66-73. [DOI: 10.1002/btpr.2197] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 11/07/2015] [Indexed: 12/12/2022]
Affiliation(s)
- Joseph Grimaldi
- Dept. of Chemical and Biological Engineering; Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute; Troy NY 12180-3590
| | - Cynthia H. Collins
- Dept. of Chemical and Biological Engineering; Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute; Troy NY 12180-3590
| | - Georges Belfort
- Dept. of Chemical and Biological Engineering; Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute; Troy NY 12180-3590
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Yeast toxicogenomics: lessons from a eukaryotic cell model and cell factory. Curr Opin Biotechnol 2015; 33:183-91. [DOI: 10.1016/j.copbio.2015.03.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 02/16/2015] [Accepted: 03/05/2015] [Indexed: 12/21/2022]
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12
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Zhang S, Sun J, Zhang X, Xin J, Miao Q, Wang J. Ionic liquid-based green processes for energy production. Chem Soc Rev 2015; 43:7838-69. [PMID: 24553494 DOI: 10.1039/c3cs60409h] [Citation(s) in RCA: 339] [Impact Index Per Article: 37.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
To mitigate the growing pressure on resource depletion and environment degradation, the development of green processes for the production of renewable energy is highly required. As a class of novel and promising media, ionic liquids (ILs) have shown infusive potential applications in energy production. Aiming to offer a critical overview regarding the new challenges and opportunities of ILs for developing green processes of renewable energy, this article emphasises the role of ILs as catalysts, solvents, or electrolytes in three broadly interesting energy production processes from renewable resources, such as CO2 conversion to fuels and fuel additives, biomass pretreatment and conversion to biofuels, as well as solar energy and energy storage. It is expected that this article will stimulate a generation of new ideas and new technologies in IL-based renewable energy production.
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Affiliation(s)
- Suojiang Zhang
- Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China.
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Ngamprasertsith S, Sunphorka S, Kuchonthara P, Reubroycharoen P, Sawangkeaw R. Pretreatment of rice straw by hot-compressed water for enzymatic saccharification. KOREAN J CHEM ENG 2015. [DOI: 10.1007/s11814-014-0389-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Becerra M, Cerdán ME, González-Siso MI. Biobutanol from cheese whey. Microb Cell Fact 2015; 14:27. [PMID: 25889728 PMCID: PMC4404668 DOI: 10.1186/s12934-015-0200-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 01/26/2015] [Indexed: 11/17/2022] Open
Abstract
At present, due to environmental and economic concerns, it is urgent to evolve efficient, clean and secure systems for the production of advanced biofuels from sustainable cheap sources. Biobutanol has proved better characteristics than the more widely used bioethanol, however the main disadvantage of biobutanol is that it is produced in low yield and titer by ABE (acetone-butanol-ethanol) fermentation, this process being not competitive from the economic point of view. In this review we summarize the natural metabolic pathways for biobutanol production by Clostridia and yeasts, together with the metabolic engineering efforts performed up to date with the aim of either enhancing the yield of the natural producer Clostridia or transferring the butanol production ability to other hosts with better attributes for industrial use and facilities for genetic manipulation. Molasses and starch-based feedstocks are main sources for biobutanol production at industrial scale hitherto. We also review herewith (and for the first time up to our knowledge) the research performed for the use of whey, the subproduct of cheese making, as another sustainable source for biobutanol production. This represents a promising alternative that still needs further research. The use of an abundant waste material like cheese whey, that would otherwise be considered an environmental pollutant, for biobutanol production, makes economy of the process more profitable.
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Affiliation(s)
- Manuel Becerra
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Departamento de Bioloxía Celular e Molecular, Facultade de Ciencias, Universidade da Coruña, Campus de A Coruña, 15071, A Coruña, Spain.
| | - María Esperanza Cerdán
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Departamento de Bioloxía Celular e Molecular, Facultade de Ciencias, Universidade da Coruña, Campus de A Coruña, 15071, A Coruña, Spain.
| | - María Isabel González-Siso
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Departamento de Bioloxía Celular e Molecular, Facultade de Ciencias, Universidade da Coruña, Campus de A Coruña, 15071, A Coruña, Spain.
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Li HG, Ofosu FK, Li KT, Gu QY, Wang Q, Yu XB. Acetone, butanol, and ethanol production from gelatinized cassava flour by a new isolates with high butanol tolerance. BIORESOURCE TECHNOLOGY 2014; 172:276-282. [PMID: 25270042 DOI: 10.1016/j.biortech.2014.09.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 09/12/2014] [Accepted: 09/13/2014] [Indexed: 06/03/2023]
Abstract
To obtain native strains resistant to butanol toxicity, a new isolating method and serial enrichment was used in this study. With this effort, mutant strain SE36 was obtained, which could withstand 35g/L (compared to 20g/L of the wild-type strain) butanol challenge. Based on 16s rDNA comparison, the mutant strain was identified as Clostridium acetobutylicum. Under the optimized condition, the phase shift was smoothly triggered and fermentation performances were consequently enhanced. The maximum total solvent and butanol concentration were 23.6% and 24.3%, respectively higher than that of the wild-type strain. Furthermore, the correlation between butanol produced and the butanol tolerance was investigated, suggesting that enhancing butanol tolerance could improve butanol production. These results indicate that the simple but effective isolation method and acclimatization process are a promising technique for isolation and improvement of butanol tolerance and production.
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Affiliation(s)
- Han-Guang Li
- College of Bioscience and Engineering, Jiangxi Agricultural University, Nanchang 330045, China; The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Fred Kwame Ofosu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Kun-Tai Li
- College of Bioscience and Engineering, Jiangxi Agricultural University, Nanchang 330045, China
| | - Qiu-Ya Gu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Qiang Wang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Xiao-Bin Yu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
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Dashtban M, Gilbert A, Fatehi P. Separation of lignocelluloses from spent liquor of NSSC pulping process via adsorption. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2014; 136:62-67. [PMID: 24565877 DOI: 10.1016/j.jenvman.2014.01.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 01/26/2014] [Accepted: 01/28/2014] [Indexed: 06/03/2023]
Abstract
Hemicelluloses and lignin present in the spent liquor (SL) of neutral sulfite semichemical (NSSC) pulping process can potentially be converted into value-added products such as furfural, hydroxymethylfurfural, levulinic acid, phenols and adhesives. However, the direct conversion of hemicelluloses and lignin of SL into value-added products is uneconomical due to the dilute nature of the SL. To have a feasible downstream process for utilizing lignocelluloses of SL, the lignocelluloses should initially be separated from the SL. In this study, an adsorption process (via applying activated carbon) was considered for isolating the dissolved lignin and hemicelluloses from the SL of an NSSC pulping process. Under the optimal conditions of pH, SL/AC weight ratio, time and temperature of 5.7, 30, 360 min and 30 °C, the maximum lignin and hemicellulose adsorptions were 0.33 and 0.25 g/g on AC. The chemical oxygen demand (COD) and turbidity of the SL were decreased by 11% and 39%, respectively, as a result of lignocellulose adsorption on AC. Also, the incineration behavior of the SL-treated AC was studied with a thermo-gravimetric analysis (TGA).
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Affiliation(s)
- Mehdi Dashtban
- Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, Canada P7E 5E1
| | - Allan Gilbert
- Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, Canada P7E 5E1
| | - Pedram Fatehi
- Chemical Engineering Department, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, Canada P7E 5E1.
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Grimaldi J, Collins CH, Belfort G. Toward cell-free biofuel production: Stable immobilization of oligomeric enzymes. Biotechnol Prog 2014; 30:324-31. [DOI: 10.1002/btpr.1876] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 01/14/2014] [Indexed: 11/12/2022]
Affiliation(s)
- J. Grimaldi
- Howard P. Isermann Dept. of Chemical and Biological Engineering; Center for Biotechnology and Interdisciplinary Studies, RPI; Troy NY 12180-3590
| | - C. H. Collins
- Howard P. Isermann Dept. of Chemical and Biological Engineering; Center for Biotechnology and Interdisciplinary Studies, RPI; Troy NY 12180-3590
| | - G. Belfort
- Howard P. Isermann Dept. of Chemical and Biological Engineering; Center for Biotechnology and Interdisciplinary Studies, RPI; Troy NY 12180-3590
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Dashtban M, Gilbert A, Fatehi P. Recent advancements in the production of hydroxymethylfurfural. RSC Adv 2014. [DOI: 10.1039/c3ra45396k] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Improvement of thermostable aldehyde dehydrogenase by directed evolution for application in Synthetic Cascade Biomanufacturing. Enzyme Microb Technol 2013; 53:307-14. [PMID: 24034429 DOI: 10.1016/j.enzmictec.2013.07.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2013] [Revised: 07/06/2013] [Accepted: 07/08/2013] [Indexed: 11/22/2022]
Abstract
The aldehyde dehydrogenase from Thermoplasma acidophilum, which was previously implemented as a key enzyme in a synthetic cell-free reaction cascade for the production of alcohols, was optimized by directed evolution. Improvements have been made to enhance reaction velocity and solubility. Using a random approach followed by site-directed and saturation mutagenesis, three beneficial amino acid mutations were found after screening of ca. 20,000 variants. Mutation Y399C enhanced the protein solubility after recombinant expression in Escherichia coli 6-fold. Two further mutations, F34M and S405N, enhanced enzyme activity with the cofactor NAD(+) by a factor of eight. Impacts on enzyme stability and substrate specificity were negligible. Modeling of the enzyme structure did not reveal any direct interactions between the amino acid substitutions and residues of the active site or the enzyme's substrates. Thus, a directed evolution approach allowed for the generation of improved enzyme variants which were unlikely to be found by rational or semi-rational strategies.
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Waste valorization by biotechnological conversion into added value products. Appl Microbiol Biotechnol 2013; 97:6129-47. [DOI: 10.1007/s00253-013-5014-7] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 05/20/2013] [Accepted: 05/21/2013] [Indexed: 11/25/2022]
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