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Maharjan A, Choi W, Kim HT, Park JH. Catalytic hydrolysis of agar using magnetic nanoparticles: optimization and characterization. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2023; 16:193. [PMID: 38093358 PMCID: PMC10720145 DOI: 10.1186/s13068-023-02441-w] [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: 10/13/2023] [Accepted: 11/27/2023] [Indexed: 12/17/2023]
Abstract
BACKGROUND Agar is used as a gelling agent that possesses a variety of biological properties; it consists of the polysaccharides agarose and porphyrin. In addition, the monomeric sugars generated after agar hydrolysis can be functionalized for use in biorefineries and biofuel production. The main objective of this study was to develop a sustainable agar hydrolysis process for bioethanol production using nanotechnology. Peroxidase-mimicking Fe3O4-MNPs were applied for agar degradation to generate agar hydrolysate-soluble fractions amenable to Saccharomyces cerevisiae and Escherichia coli during fermentation. RESULTS Fe3O4-MNP-treated (Fe3O4-MNPs, 1 g/L) agar exhibited 0.903 g/L of reducing sugar, which was 21-fold higher than that of the control (without Fe3O4-MNP-treated). Approximately 0.0181% and 0.0042% of ethanol from 1% of agar was achieved using Saccharomyces cerevisiae and Escherichia coli, respectively, after process optimization. Furthermore, different analytical techniques (FTIR, SEM, TEM, EDS, XRD, and TGA) were applied to validate the efficiency of Fe3O4-MNPs in agar degradation. CONCLUSIONS To the best of our knowledge, Fe3O4-MNP-treated agar degradation for bioethanol production through process optimization is a simpler, easier, and novel method for commercialization.
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Affiliation(s)
- Anoth Maharjan
- Bio-Evaluation Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju, 28116, Republic of Korea
| | - Wonho Choi
- 4D Convergence Technology Institute (National Key Technology Institute in University), Korea National University of Transportation, Jungpyeong, 27909, Republic of Korea
| | - Hee Taek Kim
- Department of Food Science and Technology, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Jung-Ho Park
- Bio-Evaluation Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju, 28116, Republic of Korea.
- Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, Korea University of Science and Technology (UST), 217 Gajeong-Ro, Yuseong-Gu, Daejeon, Korea.
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2
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Pasotti L, De Marchi D, Casanova M, Frusteri Chiacchiera A, Cusella De Angelis MG, Calvio C, Magni P. Design of a stable ethanologenic bacterial strain without heterologous plasmids and antibiotic resistance genes for efficient ethanol production from concentrated dairy waste. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2023; 16:57. [PMID: 37005680 PMCID: PMC10067303 DOI: 10.1186/s13068-023-02298-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 03/03/2023] [Indexed: 04/04/2023]
Abstract
Engineering sustainable bioprocesses that convert abundant waste into fuels is pivotal for efficient production of renewable energy. We previously engineered an Escherichia coli strain for optimized bioethanol production from lactose-rich wastewater like concentrated whey permeate (CWP), a dairy effluent obtained from whey valorization processes. Although attractive fermentation performances were reached, significant improvements are required to eliminate recombinant plasmids, antibiotic resistances and inducible promoters, and increase ethanol tolerance. Here, we report a new strain with chromosomally integrated ethanologenic pathway under the control of a constitutive promoter, without recombinant plasmids and resistance genes. The strain showed extreme stability in 1-month subculturing, with CWP fermentation performances similar to the ethanologenic plasmid-bearing strain. We then investigated conditions enabling efficient ethanol production and sugar consumption by changing inoculum size and CWP concentration, revealing toxicity- and nutritional-related bottlenecks. The joint increase of ethanol tolerance, via adaptive evolution, and supplementation of small ammonium sulphate amounts (0.05% w/v) enabled a fermentation boost with 6.6% v/v ethanol titer, 1.2 g/L/h rate, 82.5% yield, and cell viability increased by three orders of magnitude. Our strain has attractive features for industrial settings and represents a relevant improvement in the existing ethanol production biotechnologies.
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Affiliation(s)
- Lorenzo Pasotti
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy.
- Centre for Health Technologies, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy.
| | - Davide De Marchi
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
- Centre for Health Technologies, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
| | - Michela Casanova
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
- Centre for Health Technologies, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
| | - Angelica Frusteri Chiacchiera
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
- Centre for Health Technologies, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
| | - Maria Gabriella Cusella De Angelis
- Centre for Health Technologies, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
- Department of Public Health, Experimental and Forensic Medicine, University of Pavia, Via Forlanini 8, 27100, Pavia, Italy
| | - Cinzia Calvio
- Centre for Health Technologies, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
- Department of Biology and Biotechnology, University of Pavia, Via Ferrata 9, 27100, Pavia, Italy
| | - Paolo Magni
- Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
- Centre for Health Technologies, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy
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3
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Jarboe LR, Khalid A, Ocasio ER, Fashkami KN. Extrapolation of design strategies for lignocellulosic biomass conversion to the challenge of plastic waste. J Ind Microbiol Biotechnol 2022; 49:6510821. [PMID: 35040946 PMCID: PMC9119000 DOI: 10.1093/jimb/kuac001] [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: 12/07/2021] [Accepted: 01/18/2022] [Indexed: 11/12/2022]
Abstract
The goal of cost-effective production of fuels and chemicals from biomass has been a substantial driver of the development of the field of Metabolic Engineering. The resulting design principles and procedures provide a guide for the development of cost-effective methods for degradation, and possibly even valorization, of plastic wastes. Here we highlight these parallels, using the creative work of Lonnie O'Neal (Neal) Ingram in enabling production of fuels and chemicals from lignocellulosic biomass, with a focus on ethanol production as an exemplar process.
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Affiliation(s)
- Laura R Jarboe
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
| | - Ammara Khalid
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
| | - Efrain Rodriguez Ocasio
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
| | - Kimia Noroozi Fashkami
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
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4
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Mesquita TJ, Campani G, Giordano RC, Ribeiro MP, Horta AC, Zangirolami TC, Lima FV. Operability and biomimetic control of a micro-aerated fermentation process. Comput Chem Eng 2021. [DOI: 10.1016/j.compchemeng.2021.107511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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5
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Sierra-Ibarra E, Leal-Reyes LJ, Huerta-Beristain G, Hernández-Orihuela AL, Gosset G, Martínez-Antonio A, Martinez A. Limited oxygen conditions as an approach to scale-up and improve D and L-lactic acid production in mineral media and avocado seed hydrolysates with metabolically engineered Escherichia coli. Bioprocess Biosyst Eng 2020; 44:379-389. [PMID: 33029675 DOI: 10.1007/s00449-020-02450-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 09/14/2020] [Indexed: 10/23/2022]
Abstract
The effectiveness of micro-aeration on lactate (LA) production by metabolically engineered Escherichia coli was evaluated in 1 L bioreactors containing mineral media and glucose (70 g/L). Volumetric oxygen transfer coefficients (kLa) between 12.6 and 28.7 h-1 increased the specific growth rate (µ) and volumetric productivity (QLA) by 300 and 400%, respectively, without a significant decrease in lactate yield (YLA), when compared with non-aerated fermentations. A kLa of 12.6 h-1 was successfully used as a criterion to scale-up the production of L and D-lactate from 1 to 11 and 130 L. Approximately constant QLA and YLA values were obtained throughout the fermentation scale-up process. Furthermore, a D-lactogenic fermentation was carried out in 1 L bioreactors using avocado seed hydrolysate as a culture medium under the same kLa value, displaying high QLA and YLA.
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Affiliation(s)
- Estefanía Sierra-Ibarra
- Departamento de Ingeniería Celular Y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México. Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos, 62210, México
| | - Laura J Leal-Reyes
- Departamento de Ingeniería Celular Y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México. Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos, 62210, México
| | - Gerardo Huerta-Beristain
- Departamento de Ingeniería Celular Y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México. Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos, 62210, México.,Facultad de Ciencias Quıímico Biológicas, Universidad Autónoma de Guerrero, Av. Lazaro Cardenas S/N. Cd. Universitaria, 39070, Chilpancingo, Guerrero, Mexico
| | - Ana L Hernández-Orihuela
- Departamento de Ingeniería Genética. Centro de Investigación Y de Estudios Avanzados del, Instituto Politécnico Nacional. Unidad Irapuato. Km. 9.6 Libramiento Norte Carretera Irapuato-León, Irapuato, C.P. 36821, Guanajuato, México
| | - Guillermo Gosset
- Departamento de Ingeniería Celular Y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México. Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos, 62210, México
| | - Agustino Martínez-Antonio
- Departamento de Ingeniería Genética. Centro de Investigación Y de Estudios Avanzados del, Instituto Politécnico Nacional. Unidad Irapuato. Km. 9.6 Libramiento Norte Carretera Irapuato-León, Irapuato, C.P. 36821, Guanajuato, México
| | - Alfredo Martinez
- Departamento de Ingeniería Celular Y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México. Av. Universidad 2001, Col. Chamilpa, Cuernavaca, Morelos, 62210, México.
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6
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Pasotti L, De Marchi D, Casanova M, Massaiu I, Bellato M, Cusella De Angelis MG, Calvio C, Magni P. Engineering endogenous fermentative routes in ethanologenic Escherichia coli W for bioethanol production from concentrated whey permeate. N Biotechnol 2020; 57:55-66. [DOI: 10.1016/j.nbt.2020.02.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 02/17/2020] [Accepted: 02/29/2020] [Indexed: 12/01/2022]
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7
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Rojas-Chamorro JA, Romero-García JM, Cara C, Romero I, Castro E. Improved ethanol production from the slurry of pretreated brewers' spent grain through different co-fermentation strategies. BIORESOURCE TECHNOLOGY 2020; 296:122367. [PMID: 31727558 DOI: 10.1016/j.biortech.2019.122367] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 10/31/2019] [Accepted: 11/01/2019] [Indexed: 06/10/2023]
Abstract
The aim of this work was to bioconvert all sugars in BSG into ethanol using a process scheme that includes the enzymatic hydrolysis of the whole slurry resulting from the pretreatment of BSG with phosphoric and sulfuric acid using previously optimised conditions, followed by the co-fermentation of the mixed sugars. More than 90% of the sugars in raw BSG were recovered in the pretreatment and the subsequent enzymatic hydrolysis of the whole slurry. The co-fermentation of the enzymatic hydrolysates with Escherichia coli was then compared with that the co-culture of Scheffersomyces stipitis and Saccharomyces cerevisiae, which resulted in lower ethanol production. The co-fermentation strategy with a single microorganism (E. coli) when BSG was pretreated with phosphoric acid resulted into the highest ethanol concentration, 39 g/L, which means that 222 L of ethanol can be obtained from a ton of BSG without detoxification requirements.
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Affiliation(s)
- J A Rojas-Chamorro
- Dpt. Chemical, Environmental and Materials Engineering, Universidad de Jaén, Spain
| | - J M Romero-García
- Dpt. Chemical, Environmental and Materials Engineering, Universidad de Jaén, Spain; Center for Advanced Studies in Energy and Environment, Universidad de Jaén, Campus las Lagunillas, 23071 Jaén, Spain
| | - C Cara
- Dpt. Chemical, Environmental and Materials Engineering, Universidad de Jaén, Spain; Center for Advanced Studies in Energy and Environment, Universidad de Jaén, Campus las Lagunillas, 23071 Jaén, Spain
| | - I Romero
- Dpt. Chemical, Environmental and Materials Engineering, Universidad de Jaén, Spain; Center for Advanced Studies in Energy and Environment, Universidad de Jaén, Campus las Lagunillas, 23071 Jaén, Spain.
| | - E Castro
- Dpt. Chemical, Environmental and Materials Engineering, Universidad de Jaén, Spain; Center for Advanced Studies in Energy and Environment, Universidad de Jaén, Campus las Lagunillas, 23071 Jaén, Spain
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8
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Wang L, York SW, Ingram LO, Shanmugam KT. Simultaneous fermentation of biomass-derived sugars to ethanol by a co-culture of an engineered Escherichia coli and Saccharomyces cerevisiae. BIORESOURCE TECHNOLOGY 2019; 273:269-276. [PMID: 30448678 DOI: 10.1016/j.biortech.2018.11.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/04/2018] [Accepted: 11/05/2018] [Indexed: 06/09/2023]
Abstract
Microorganisms ferment xylose at high rate only when glucose concentration in the medium falls below a critical level. Since the specific productivity of product is highest during exponential to early stationary phase of growth, a glucose utilization negative ethanologenic E. coli (strain LW419a) was constructed for high rate of xylose fermentation in combination with Turbo yeast. This co-culture fermented all the released sugars in an acid/enzyme-treated sugar cane bagasse slurry (10% solids) to an ethanol titer of 24.9 ± 0.8 g.L-1 (70% of the theoretical yield) in <30 h. Ethanol titer increased to 48.6 ± 1.04 g.L-1 (yield, 0.45 g.g-1 sugars) at a solids content of 20% and the highest rate of xylose consumption was 1.58 ± 0.21 g.L-1.h-1. This study demonstrates the potential of a co-culture of strain LW419a and yeast to rapidly ferment all the sugars in pretreated biomass slurries to ethanol at their respective highest rates.
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Affiliation(s)
- Liang Wang
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, United States.
| | - Sean W York
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, United States.
| | - Lonnie O Ingram
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, United States.
| | - K T Shanmugam
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, United States.
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9
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Martínez-Patiño JC, Ruiz E, Cara C, Romero I, Castro E. Advanced bioethanol production from olive tree biomass using different bioconversion schemes. Biochem Eng J 2018. [DOI: 10.1016/j.bej.2018.06.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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10
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Wu W, Rondon V, Weeks K, Pullammanappallil P, Ingram LO, Shanmugam KT. Phosphoric acid based pretreatment of switchgrass and fermentation of entire slurry to ethanol using a simplified process. BIORESOURCE TECHNOLOGY 2018; 251:171-180. [PMID: 29274857 DOI: 10.1016/j.biortech.2017.12.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 12/13/2017] [Accepted: 12/14/2017] [Indexed: 05/21/2023]
Abstract
Switchgrass (Alamo) was pretreated with phosphoric acid (0.75 and 1%, w/w) at three temperatures (160, 175 and 190 °C) and time (5, 7.5 and 10 min) using a steam gun. The slurry after pretreatment was liquefied by enzymes and the released sugars were fermented in a simultaneous saccharification and co-fermentation process to ethanol using ethanologenic Escherichia coli strain SL100. Among the three variables in pretreatment, temperature and time were critical in supporting ethanol titer and yield. Enzyme hydrolysis significantly increased the concentration of furans in slurries, apparently due to release of furans bound to the solids. The highest ethanol titer of 21.2 ± 0.3 g/L ethanol obtained at the pretreatment condition of 190-1-7.5 (temperature-acid concentration-time) and 10% solids loading accounted for 190 ± 2.9 g ethanol/kg of raw switch grass. This converts to 61.7 gallons of ethanol per ton of dry switchgrass, a value that is comparable to other published pretreatment conditions.
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Affiliation(s)
- Wei Wu
- Department of Microbiology and Cell Science, Gainesville, FL 32611, United States; Department of Agricultural and Biological Engineering, Gainesville, FL 32611, United States
| | - Vanessa Rondon
- Department of Microbiology and Cell Science, Gainesville, FL 32611, United States; Stan Mayfield Biorefinery, University of Florida, Gainesville, FL 32611, United States
| | - Kalvin Weeks
- Stan Mayfield Biorefinery, University of Florida, Gainesville, FL 32611, United States
| | | | - Lonnie O Ingram
- Department of Microbiology and Cell Science, Gainesville, FL 32611, United States; Stan Mayfield Biorefinery, University of Florida, Gainesville, FL 32611, United States
| | - K T Shanmugam
- Department of Microbiology and Cell Science, Gainesville, FL 32611, United States.
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11
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Akbas MY, Stark BC. Recent trends in bioethanol production from food processing byproducts. J Ind Microbiol Biotechnol 2016; 43:1593-1609. [PMID: 27565674 DOI: 10.1007/s10295-016-1821-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 07/30/2016] [Indexed: 12/19/2022]
Abstract
The widespread use of corn starch and sugarcane as sources of sugar for the production of ethanol via fermentation may negatively impact the use of farmland for production of food. Thus, alternative sources of fermentable sugars, particularly from lignocellulosic sources, have been extensively investigated. Another source of fermentable sugars with substantial potential for ethanol production is the waste from the food growing and processing industry. Reviewed here is the use of waste from potato processing, molasses from processing of sugar beets into sugar, whey from cheese production, byproducts of rice and coffee bean processing, and other food processing wastes as sugar sources for fermentation to ethanol. Specific topics discussed include the organisms used for fermentation, strategies, such as co-culturing and cell immobilization, used to improve the fermentation process, and the use of genetic engineering to improve the performance of ethanol producing fermenters.
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Affiliation(s)
- Meltem Yesilcimen Akbas
- Department of Molecular Biology and Genetics, Gebze Technical University, Gebze-Kocaeli, Kocaeli, 41400, Turkey. .,Institute of Biotechnology, Gebze Technical University, Gebze-Kocaeli, Kocaeli, 41400, Turkey.
| | - Benjamin C Stark
- Biology Department, Illinois Institute of Technology, Chicago, IL, 60616, USA
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12
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Gubicza K, Nieves IU, Sagues WJ, Barta Z, Shanmugam KT, Ingram LO. Techno-economic analysis of ethanol production from sugarcane bagasse using a Liquefaction plus Simultaneous Saccharification and co-Fermentation process. BIORESOURCE TECHNOLOGY 2016; 208:42-48. [PMID: 26918837 DOI: 10.1016/j.biortech.2016.01.093] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 01/22/2016] [Accepted: 01/25/2016] [Indexed: 06/05/2023]
Abstract
A techno-economic analysis was conducted for a simplified lignocellulosic ethanol production process developed and proven by the University of Florida at laboratory, pilot, and demonstration scales. Data obtained from all three scales of development were used with Aspen Plus to create models for an experimentally-proven base-case and 5 hypothetical scenarios. The model input parameters that differed among the hypothetical scenarios were fermentation time, enzyme loading, enzymatic conversion, solids loading, and overall process yield. The minimum ethanol selling price (MESP) varied between 50.38 and 62.72 US cents/L. The feedstock and the capital cost were the main contributors to the production cost, comprising between 23-28% and 40-49% of the MESP, respectively. A sensitivity analysis showed that overall ethanol yield had the greatest effect on the MESP. These findings suggest that future efforts to increase the economic feasibility of a cellulosic ethanol process should focus on optimization for highest ethanol yield.
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Affiliation(s)
- Krisztina Gubicza
- Department of Applied Biotechnology and Food Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, H-1111 Budapest, Muegyetem rkp. 3, Hungary
| | - Ismael U Nieves
- Stan Mayfield Biorefinery, University of Florida, Perry, FL 32348, United States
| | - William J Sagues
- Stan Mayfield Biorefinery, University of Florida, Perry, FL 32348, United States
| | - Zsolt Barta
- Department of Applied Biotechnology and Food Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, H-1111 Budapest, Muegyetem rkp. 3, Hungary
| | - K T Shanmugam
- Stan Mayfield Biorefinery, University of Florida, Perry, FL 32348, United States; Microbiology & Cell Science, University of Florida, Gainesville, FL 32611-0700, United States
| | - Lonnie O Ingram
- Stan Mayfield Biorefinery, University of Florida, Perry, FL 32348, United States; Microbiology & Cell Science, University of Florida, Gainesville, FL 32611-0700, United States.
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13
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Potential of phosphoric acid-catalyzed pretreatment and subsequent enzymatic hydrolysis for biosugar production from Gracilaria verrucosa. Bioprocess Biosyst Eng 2016; 39:1173-80. [PMID: 27003825 DOI: 10.1007/s00449-016-1593-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 03/14/2016] [Indexed: 10/22/2022]
Abstract
This study combined phosphoric acid-catalyzed pretreatment and enzymatic hydrolysis to produce biosugars from Gracilaria verrucosa as a potential renewable resource for bioenergy applications. We optimized phosphoric acid-catalyzed pretreatment conditions to 1:10 solid-to-liquid ratio, 1.5 % phosphoric acid, 140 °C, and 60 min reaction time, producing a 32.52 ± 0.06 % total reducing sugar (TRS) yield. By subsequent enzymatic hydrolysis, a 68.61 ± 0.90 % TRS yield was achieved. These results demonstrate the potential of phosphoric acid to produce biosugars for biofuel and biochemical production applications.
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14
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Shi A, Zheng H, Yomano LP, York SW, Shanmugam KT, Ingram LO. Plasmidic Expression of nemA and yafC* Increased Resistance of Ethanologenic Escherichia coli LY180 to Nonvolatile Side Products from Dilute Acid Treatment of Sugarcane Bagasse and Artificial Hydrolysate. Appl Environ Microbiol 2016; 82:2137-2145. [PMID: 26826228 PMCID: PMC4807516 DOI: 10.1128/aem.03488-15] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 01/24/2016] [Indexed: 11/20/2022] Open
Abstract
Hydrolysate-resistant Escherichia coli SL100 was previously isolated from ethanologenic LY180 after sequential transfers in AM1 medium containing a dilute acid hydrolysate of sugarcane bagasse and was used as a source of resistance genes. Many genes that affect tolerance to furfural, the most abundant inhibitor, have been described previously. To identify genes associated with inhibitors other than furfural, plasmid clones were selected in an artificial hydrolysate that had been treated with a vacuum to remove furfural. Two new resistance genes were discovered from Sau3A1 libraries of SL100 genomic DNA: nemA (N-ethylmaleimide reductase) and a putative regulatory gene containing a mutation in the coding region, yafC*. The presence of these mutations in SL100 was confirmed by sequencing. A single mutation was found in the upstream regulatory region of nemR (nemRA operon) in SL100. This mutation increased nemA activity 20-fold over that of the parent organism (LY180) in AM1 medium without hydrolysate and increased nemA mRNA levels >200-fold. Addition of hydrolysates induced nemA expression (mRNA and activity), in agreement with transcriptional control. NemA activity was stable in cell extracts (9 h, 37°C), eliminating a role for proteinase in regulation. LY180 with a plasmid expressing nemA or yafC* was more resistant to a vacuum-treated sugarcane bagasse hydrolysate and to a vacuum-treated artificial hydrolysate than LY180 with an empty-vector control. Neither gene affected furfural tolerance. The vacuum-treated hydrolysates inhibited the reduction of N-ethylmaleimide by NemA while also serving as substrates. Expression of the nemA or yafC* plasmid in LY180 doubled the rate of ethanol production from the vacuum-treated sugarcane bagasse hydrolysate.
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Affiliation(s)
- Aiqin Shi
- Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, USA
| | - Huabao Zheng
- Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, USA
| | - Lorraine P Yomano
- Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, USA
| | - Sean W York
- Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, USA
| | - Keelnatham T Shanmugam
- Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, USA
| | - Lonnie O Ingram
- Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, USA
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15
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Romero-García J, Martínez-Patiño C, Ruiz E, Romero I, Castro E. Ethanol production from olive stone hydrolysates by xylose fermenting microorganisms. ACTA ACUST UNITED AC 2016. [DOI: 10.1515/bioeth-2016-0002] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractOlive stones are the main solid byproducts obtained from olive oil production and from table olives production. As a lignocellulosic material, the use of olive stones for ethanol and other chemicals production has been proposed, particularly under the biorefinery concept. As part of such a process, this work deals with the fractionation of the lignocellulosic material by dilute acid autoclave pretreatment at 2% sulfuric acid, 130°C, 60 min and 1:1 liquid to solid ratio. Moreover, the work addresses the fermentation of the liquors obtained after pretreatment. The released sugars are composed mainly by xylose and other hemicellulosic sugars. The fermentation performance of three xylose-fermenting microorganisms, e.g. two Escherichia coli species and Scheffersomyces stipitis, are compared. The study analyzes in a first step the microorganism behavior on synthetic liquors, with a similar composition to that of the real liquors. Finally, and taken into account the results from the previous steps, the real liquor obtained from olive stones pretreatment is fermented. Results show that E. coli MM160 is the best ethanol producer out of the three microorganisms studied. Globally, the pretreatment produced a liquor containing 140 g hemicellulosic sugars/l and requiring firstly dilution by 50% and a detoxification step by overliming. The fermentation of this liquor by E. coli MM160 results in a 25 g ethanol/l solution equivalent to 50 g ethanol/kg olive stone, in spite of 20 g acetic acid/l also present. These results confirm both olive stones and E. coli MM160 as promising feedstock and microorganism for ethanol production.
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Sumer F, Stark BC, Yesilcimen Akbas M. Efficient ethanol production from potato and corn processing industry waste using E. coli engineered to express Vitreoscilla haemoglobin. ENVIRONMENTAL TECHNOLOGY 2015; 36:2319-2327. [PMID: 25766084 DOI: 10.1080/09593330.2015.1026846] [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] [Indexed: 06/04/2023]
Abstract
Engineering of ethanologenic E. coli to express the haemoglobin (VHb) from the bacterium Vitreoscilla has been shown to enhance ethanol production by fermentation of pure sugars, sugars from hydrolysis of lignocellulose, components of whey, and sugars from wastewater produced during potato processing. Here, these studies were extended to see whether the same effect could be seen when a mixture of waste materials from processing of potatoes and corn into potato and corn chips were used as sugar sources. Consistent increases in ethanol production coincident with VHb expression were seen in shake flasks at both low aeration and high aeration conditions. The ethanol increases were due almost entirely to increases in the amount of ethanol produced per unit of cell mass. The VHb strategy for increasing fermentation to ethanol (and perhaps other valuable fermentation products) may be of general use, particularly regarding conversion of otherwise discarded materials into valuable commodities.
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Affiliation(s)
- Fatma Sumer
- a Department of Molecular Biology and Genetics , Gebze Technical University , Gebze , Kocaeli 41400 , Turkey
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17
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Geddes R, Shanmugam KT, Ingram LO. Combining treatments to improve the fermentation of sugarcane bagasse hydrolysates by ethanologenic Escherichia coli LY180. BIORESOURCE TECHNOLOGY 2015; 189:15-22. [PMID: 25864026 DOI: 10.1016/j.biortech.2015.03.141] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 03/27/2015] [Accepted: 03/29/2015] [Indexed: 06/04/2023]
Abstract
Inhibitory side products from dilute acid pretreatment is a major challenge for conversion of lignocellulose into ethanol. Six strategies to detoxify sugarcane hydrolysates were investigated alone, and in combinations (vacuum evaporation of volatiles, high pH treatment with ammonia, laccase, bisulfite, microaeration, and inoculum size). High pH was the most beneficial single treatment, increasing the minimum inhibitory concentration (measured by ethanol production) from 15% (control) to 70% hydrolysate. Combining treatments provided incremental improvements, consistent with different modes of action and multiple inhibitory compounds. Screening toxicity using tube cultures proved to be an excellent predictor of relative performance in pH-controlled fermenters. A combination of treatments (vacuum evaporation, laccase, high pH, bisulfite, microaeration) completely eliminated all inhibitory activity present in hydrolysate. With this combination, fermentation of hemicellulose sugars (90% hydrolysate) to ethanol was complete within 48 h, identical to the fermentation of laboratory xylose (50 g/L) in AM1 mineral salts medium (without hydrolysate).
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Affiliation(s)
- Ryan Geddes
- Department of Microbiology & Cell Science, University of Florida, Box 110700, Gainesville, FL 32611, USA.
| | - Keelnatham T Shanmugam
- Department of Microbiology & Cell Science, University of Florida, Box 110700, Gainesville, FL 32611, USA.
| | - Lonnie O Ingram
- Department of Microbiology & Cell Science, University of Florida, Box 110700, Gainesville, FL 32611, USA.
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18
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Romero I, López-Linares JC, Delgado Y, Cara C, Castro E. Ethanol production from rape straw by a two-stage pretreatment under mild conditions. Bioprocess Biosyst Eng 2015; 38:1469-78. [DOI: 10.1007/s00449-015-1389-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 03/17/2015] [Indexed: 11/24/2022]
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19
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Recent applications of Vitreoscilla hemoglobin technology in bioproduct synthesis and bioremediation. Appl Microbiol Biotechnol 2015; 99:1627-36. [PMID: 25575886 DOI: 10.1007/s00253-014-6350-y] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 12/19/2014] [Accepted: 12/21/2014] [Indexed: 10/24/2022]
Abstract
Since its first use in 1990 to enhance production of α-amylase in E. coli, engineering of heterologous hosts to express the hemoglobin from the bacterium Vitreoscilla (VHb) has become a widely used strategy to enhance production of a variety of bioproducts, stimulate bioremediation, and increase growth and survival of engineered organisms. The hosts have included a variety of bacteria, yeast, fungi, higher plants, and even animals. The beneficial effects of VHb expression are presumably the result of one or more of its activities. The available evidence indicates that these include oxygen binding and delivery to the respiratory chain and oxygenases, protection against reactive oxygen species, and control of gene expression. In the past 4 to 5 years, the use of this "VHb technology" has continued in a variety of biotechnological applications in a wide range of organisms. These include enhancement of production of an ever wider array of bioproducts, new applications in bioremediation, a possible role in enhancing aerobic waste water treatment, and the potential to enhance growth and survival of both plants and animals of economic importance.
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20
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Akbas MY, Sar T, Ozcelik B. Improved ethanol production from cheese whey, whey powder, and sugar beet molasses by "Vitreoscilla hemoglobin expressing" Escherichia coli. Biosci Biotechnol Biochem 2014; 78:687-94. [PMID: 25036968 DOI: 10.1080/09168451.2014.896734] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
This work investigated the improvement of ethanol production by engineered ethanologenic Escherichia coli to express the hemoglobin from the bacterium Vitreoscilla (VHb). Ethanologenic E. coli strain FBR5 and FBR5 transformed with the VHb gene in two constructs (strains TS3 and TS4) were grown in cheese whey (CW) medium at small and large scales, at both high and low aeration, or with whey powder (WP) or sugar beet molasses hydrolysate (SBMH) media at large scale and low aeration. Culture pH, cell growth, VHb levels, and ethanol production were evaluated after 48 h. VHb expression in TS3 and TS4 enhanced their ethanol production in CW (21-419%), in WP (17-362%), or in SBMH (48-118%) media. This work extends the findings that "VHb technology" may be useful for improving the production of ethanol from waste and byproducts of various sources.
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Affiliation(s)
- Meltem Yesilcimen Akbas
- a Department of Molecular Biology and Genetics , Gebze Institute of Technology , Gebze , Turkey
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21
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Chen X, Zhou L, Tian K, Kumar A, Singh S, Prior BA, Wang Z. Metabolic engineering of Escherichia coli: A sustainable industrial platform for bio-based chemical production. Biotechnol Adv 2013; 31:1200-23. [DOI: 10.1016/j.biotechadv.2013.02.009] [Citation(s) in RCA: 117] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Revised: 02/04/2013] [Accepted: 02/25/2013] [Indexed: 12/20/2022]
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22
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Zingaro KA, Nicolaou SA, Papoutsakis ET. Dissecting the assays to assess microbial tolerance to toxic chemicals in bioprocessing. Trends Biotechnol 2013; 31:643-53. [DOI: 10.1016/j.tibtech.2013.08.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 08/14/2013] [Accepted: 08/19/2013] [Indexed: 11/15/2022]
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Li HQ, Li CL, Sang T, Xu J. Pretreatment on Miscanthus lutarioriparious by liquid hot water for efficient ethanol production. BIOTECHNOLOGY FOR BIOFUELS 2013; 6:76. [PMID: 23663476 PMCID: PMC3664608 DOI: 10.1186/1754-6834-6-76] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Accepted: 05/08/2013] [Indexed: 05/08/2023]
Abstract
BACKGROUND The C4 perennial grass Miscanthus giganteus has proved to be a promising bio-energy crop. However, the biomass recalcitrance is a major challenge in biofuel production. Effective pretreatment is necessary for achieving a high efficiency in converting the crop to fermentable sugars, and subsequently biofuels and other valued products. RESULTS Miscanthus lutarioriparious was pretreated with a liquid hot water (LHW) reactor. Between the pretreatment severity (PS) of 2.56-4.71, the solid recovery was reduced; cellulose recovery remained nearly unchanged; and the Klason lignin content was slightly increased which was mainly due to the dissolving of hemicellulose and the production of a small amount of pseudo-lignin. The result shows that a LHW PS of 4.71 could completely degrade the hemicellulose in Miscanthus. Hemicellulose removal dislodged the enzymatic barrier of cellulose, and the ethanol conversion of 98.27% was obtained. CONCLUSIONS Our study demonstrated that LHW served as an effective pretreatment in case that Miscanthus lutarioriparious was used for ethanol production by simultaneous saccharification and fermentation. The combination and the pretreatment method of Miscanthus feedstock holds a great potential for biofuel production.
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Affiliation(s)
- Hong-Qiang Li
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Cheng-Lan Li
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
| | - Tao Sang
- Key Laboratory Plant Resources and State Key Laboratory of Systematic & Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, People’s Republic of China
| | - Jian Xu
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
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de Vasconcelos SM, Santos AMP, Rocha GJM, Souto-Maior AM. Diluted phosphoric acid pretreatment for production of fermentable sugars in a sugarcane-based biorefinery. BIORESOURCE TECHNOLOGY 2013; 135:46-52. [PMID: 23186685 DOI: 10.1016/j.biortech.2012.10.083] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Revised: 10/16/2012] [Accepted: 10/18/2012] [Indexed: 05/23/2023]
Abstract
The influence of time (8-24 min), temperature (144-186 °C) and phosphoric acid concentration (0.05-0.20%, w/v) on the pretreatment of sugarcane bagasse in a 20 L batch rotary reactor was investigated. The efficiency of the pretreatment was verified by chemical characterization of the solid fraction of the pretreated bagasse and the conversion of cellulose to glucose by enzymatic hydrolysis. Models representing the percentage of cellulose, hemicelluloses, lignin, solubilized hemicellulose and the enzymatic conversion of cellulose to glucose were predictive and significant. Phosphoric acid concentration of 0.20% at temperature of 186 °C, during 8 and 24 min, was shown to be very effective in solubilizing hemicellulose from sugarcane bagasse, reaching solubilization of 96% and 98%, respectively. Relatively low amounts of inhibitors were produced, and the phosphoric acid remaining in the hemicellulosic hydrolysate is at adequate levels for supplying phosphorous requirement during subsequent fermentation.
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25
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Lan TQ, Gleisner R, Zhu JY, Dien BS, Hector RE. High titer ethanol production from SPORL-pretreated lodgepole pine by simultaneous enzymatic saccharification and combined fermentation. BIORESOURCE TECHNOLOGY 2013; 127:291-7. [PMID: 23138055 DOI: 10.1016/j.biortech.2012.09.111] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Revised: 08/10/2012] [Accepted: 09/28/2012] [Indexed: 05/17/2023]
Abstract
Lodgepole wood chips were pretreated by sulfite pretreatment to overcome recalcitrance of lignocelluloses (SPORL) at 25% solids loading and 180 °C for 20 min with sulfuric acid and sodium bisulfite charges of 2.2 and 8 wt/wt% on an oven-dry wood basis, respectively. The pretreated wood chips were disk-milled with pretreatment spent liquor and water, and the solid fraction was separated from the liquor stream. The liquor was neutralized and concentrated through vacuum evaporation. Quasi-simultaneous enzymatic saccharification of the cellulosic solids and combined fermentation with the concentrated liquor was conducted at up to 20% total solids loading. Fed-batching of the solids facilitated liquefaction and saccharification, as well as managing instantaneous inhibitor concentrations. At a commercial cellulase (CTec2) loading of only 9 FPU or 0.06 mL/g untreated wood, a maximum ethanol titer of 47.4 g/L was achieved, resulting in a calculated yield of 285 L/tonne of wood using Saccharomyces cerevisiae YRH400 at 35 °C and pH 5.5.
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Affiliation(s)
- T Q Lan
- College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, China
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26
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Geddes CC, Mullinnix MT, Nieves IU, Hoffman RW, Sagues WJ, York SW, Shanmugam KT, Erickson JE, Vermerris WE, Ingram LO. Seed train development for the fermentation of bagasse from sweet sorghum and sugarcane using a simplified fermentation process. BIORESOURCE TECHNOLOGY 2013; 128:716-724. [PMID: 23375156 DOI: 10.1016/j.biortech.2012.09.121] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Revised: 09/21/2012] [Accepted: 09/28/2012] [Indexed: 06/01/2023]
Abstract
A process was developed for seed culture expansion (3.6 million-fold) using 5% of the hemicellulose hydrolysate from dilute acid pretreatment as the sole organic nutrient and source of sugar. Hydrolysate used for seed growth was neutralized with ammonia and combined with 1.0mM sodium metabisulfite immediately before inoculation. This seed protocol was tested with phosphoric acid pretreated sugarcane and sweet sorghum bagasse using a simplified process with co-fermentation of fiber, pentoses, and hexoses in a single vessel (SScF). A 6h liquefaction (L) step improved mixing prior to inoculation. Fermentations (L+SScF process) were completed in 72 h with high yields (>80 gal/US ton). Ethanol titers for this L+SScF process ranged from 24 g/L to 32 g/L, and were limited by the bagasse concentration (10% dry matter).
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Affiliation(s)
- C C Geddes
- Dept Microbiology & Cell Science, Univ Florida, Box 110700, Gainesville, FL 32611, United States
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27
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Stark BC, Dikshit KL, Pagilla KR. The Biochemistry of Vitreoscilla hemoglobin. Comput Struct Biotechnol J 2012; 3:e201210002. [PMID: 24688662 PMCID: PMC3962134 DOI: 10.5936/csbj.201210002] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Accepted: 09/17/2012] [Indexed: 01/17/2023] Open
Abstract
The hemoglobin (VHb) from Vitreoscilla was the first bacterial hemoglobin discovered. Its structure and function have been extensively investigated, and engineering of a wide variety of heterologous organisms to express VHb has been performed to increase their growth and productivity. This strategy has shown promise in applications as far-ranging as the production of antibiotics and petrochemical replacements by microorganisms to increasing stress tolerance in plants. These applications of “VHb technology” have generally been of the “black box” variety, wherein the endpoint studied is an increase in the levels of a certain product or improved growth and survival. Their eventual optimization, however, will require a thorough understanding of the various functions and activities of VHb, and how VHb expression ripples to affect metabolism more generally. Here we review the current knowledge of these topics. VHb's functions all involve oxygen binding (and often delivery) in one way or another. Several biochemical and structure-function studies have provided an insight into the molecular details of this binding and delivery. VHb activities are varied. They include supply of oxygen to oxygenases and the respiratory chain, particularly under low oxygen conditions; oxygen sensing and modulation of transcription factor activity; and detoxification of NO, and seem to require interactions of VHb with “partner proteins”. VHb expression affects the levels of ATP and NADH, although not enormously. VHb expression may affect the level of many compounds of intermediary metabolism, and, apparently, alters the levels of expression of many genes. Thus, the metabolic changes in organisms engineered to express VHb are likely to be numerous and complicated.
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Affiliation(s)
- Benjamin C Stark
- Biology Division, Department of Biological and Chemical Sciences, Illinois Institute of Technology, Chicago IL 60616, USA
| | - Kanak L Dikshit
- Institute of Microbial Technology, Sec-39a, Chandigarh, 160036, India
| | - Krishna R Pagilla
- Department of Civil and Architectural Engineering, Illinois Institute of Technology, Chicago IL 60616, USA
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Abanoz K, Stark B, Akbas M. Enhancement of ethanol production from potato-processing wastewater by engineering Escherichia coli
using Vitreoscilla
haemoglobin. Lett Appl Microbiol 2012; 55:436-43. [DOI: 10.1111/lam.12000] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 09/10/2012] [Accepted: 09/10/2012] [Indexed: 11/29/2022]
Affiliation(s)
- K. Abanoz
- Department of Molecular Biology and Genetics; Gebze Institute of Technology; Gebze-Kocaeli Turkey
| | - B.C. Stark
- Biology Division, Department of Biological and Chemical Sciences; Illinois Institute of Technology; Chicago IL USA
| | - M.Y. Akbas
- Department of Molecular Biology and Genetics; Gebze Institute of Technology; Gebze-Kocaeli Turkey
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29
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Wang B, Lin H, Zhan J, Yang Y, Zhou Q, Zhao Y. Biodiesel synthesis by a one-step method in a genetically engineered Escherichia coli using rice straw hydrolysate and restaurant oil wastes as raw materials. J Appl Microbiol 2012; 113:531-40. [DOI: 10.1111/j.1365-2672.2012.05357.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2012] [Revised: 05/13/2012] [Accepted: 06/02/2012] [Indexed: 11/28/2022]
Affiliation(s)
- B. Wang
- Institute of Microbiology; College of Life Sciences; Zhejiang University; Hangzhou; China
| | - H. Lin
- Institute of Microbiology; College of Life Sciences; Zhejiang University; Hangzhou; China
| | - J. Zhan
- Institute of Plant Science; College of Life Sciences; Zhejiang University; Hangzhou; China
| | - Y. Yang
- Institute of Microbiology; College of Life Sciences; Zhejiang University; Hangzhou; China
| | - Q. Zhou
- Institute of Plant Science; College of Life Sciences; Zhejiang University; Hangzhou; China
| | - Y. Zhao
- Institute of Microbiology; College of Life Sciences; Zhejiang University; Hangzhou; China
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