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Wang XL, Sun YQ, Pan DT, Xiu ZL. Kinetics-based development of two-stage continuous fermentation of 1,3-propanediol from crude glycerol by Clostridium butyricum. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2024; 17:38. [PMID: 38454489 PMCID: PMC10921705 DOI: 10.1186/s13068-024-02486-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 03/01/2024] [Indexed: 03/09/2024]
Abstract
BACKGROUND Glycerol, as a by-product, mainly derives from the conversion of many crops to biodiesel, ethanol, and fatty ester. Its bioconversion to 1,3-propanediol (1,3-PDO) is an environmentally friendly method. Continuous fermentation has many striking merits over fed-batch and batch fermentation, such as high product concentration with easy feeding operation, long-term high productivity without frequent seed culture, and energy-intensive sterilization. However, it is usually difficult to harvest high product concentrations. RESULTS In this study, a three-stage continuous fermentation was firstly designed to produce 1,3-PDO from crude glycerol by Clostridium butyricum, in which the first stage fermentation was responsible for providing the excellent cells in a robust growth state, the second stage focused on promoting 1,3-PDO production, and the third stage aimed to further boost the 1,3-PDO concentration and reduce the residual glycerol concentration as much as possible. Through the three-stage continuous fermentation, 80.05 g/L 1,3-PDO as the maximum concentration was produced while maintaining residual glycerol of 5.87 g/L, achieving a yield of 0.48 g/g and a productivity of 3.67 g/(L·h). Based on the 14 sets of experimental data from the first stage, a kinetic model was developed to describe the intricate relationships among the concentrations of 1,3-PDO, substrate, biomass, and butyrate. Subsequently, this kinetic model was used to optimize and predict the highest 1,3-PDO productivity of 11.26 g/(L·h) in the first stage fermentation, while the glycerol feeding concentration and dilution rate were determined to be 92 g/L and 0.341 h-1, separately. Additionally, to achieve a target 1,3-PDO production of 80 g/L without the third stage fermentation, the predicted minimum volume ratio of the second fermenter to the first one was 11.9. The kinetics-based two-stage continuous fermentation was experimentally verified well with the predicted results. CONCLUSION A novel three-stage continuous fermentation and a kinetic model were reported. Then a simpler two-stage continuous fermentation was developed based on the optimization of the kinetic model. This kinetics-based development of two-stage continuous fermentation could achieve high-level production of 1,3-PDO. Meanwhile, it provides a reference for other bio-chemicals production by applying kinetics to optimize multi-stage continuous fermentation.
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Affiliation(s)
- Xiao-Li Wang
- MOE Key Laboratory of Bio-Intelligent Manufacturing, School of Bioengineering, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, Liaoning, People's Republic of China
| | - Ya-Qin Sun
- MOE Key Laboratory of Bio-Intelligent Manufacturing, School of Bioengineering, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, Liaoning, People's Republic of China
| | - Duo-Tao Pan
- Institute of Information and Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, Liaoning, People's Republic of China
| | - Zhi-Long Xiu
- MOE Key Laboratory of Bio-Intelligent Manufacturing, School of Bioengineering, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, Liaoning, People's Republic of China.
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Bortolucci J, Guazzaroni ME, Schoch T, Dürre P, Reginatto V. Enhancing 1,3-Propanediol Productivity in the Non-Model Chassis Clostridium beijerinckii through Genetic Manipulation. Microorganisms 2023; 11:1855. [PMID: 37513028 PMCID: PMC10383064 DOI: 10.3390/microorganisms11071855] [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: 06/16/2023] [Revised: 07/20/2023] [Accepted: 07/20/2023] [Indexed: 07/30/2023] Open
Abstract
Biotechnological processes at biorefineries are considered one of the most attractive alternatives for valorizing biomasses by converting them into bioproducts, biofuels, and bioenergy. For example, biodiesel can be obtained from oils and grease but generates glycerol as a byproduct. Glycerol recycling has been studied in several bioprocesses, with one of them being its conversion to 1,3-propanediol (1,3-PDO) by Clostridium. Clostridium beijerinckii is particularly interesting because it can produce a range of industrially relevant chemicals, including solvents and organic acids, and it is non-pathogenic. However, while Clostridium species have many potential advantages as chassis for synthetic biology applications, there are significant limitations when considering their use, such as their limited genetic tools, slow growth rate, and oxygen sensitivity. In this work, we carried out the overexpression of the genes involved in the synthesis of 1,3-PDO in C. beijerinckii Br21, which allowed us to increase the 1,3-PDO productivity in this strain. Thus, this study contributed to a better understanding of the metabolic pathways of glycerol conversion to 1,3-PDO by a C. beijerinckii isolate. Also, it made it possible to establish a transformation method of a modular vector in this strain, therefore expanding the limited genetic tools available for this bacterium, which is highly relevant in biotechnological applications.
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Affiliation(s)
- Jonatã Bortolucci
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes, 3900, Ribeirão Preto 14040-030, SP, Brazil
| | - María-Eugenia Guazzaroni
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes, 3900, Ribeirão Preto 14040-030, SP, Brazil
| | - Teresa Schoch
- Institut für Mikrobiologie und Biotechnologie, Universität Ulm, Albert-Einstein-Allee, 11, D-89081 Ulm, Germany
| | - Peter Dürre
- Institut für Mikrobiologie und Biotechnologie, Universität Ulm, Albert-Einstein-Allee, 11, D-89081 Ulm, Germany
| | - Valeria Reginatto
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes, 3900, Ribeirão Preto 14040-030, SP, Brazil
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Gupta AK, Rather MA, Mishra P. Design and development of laboratory scale batch type device for debittering of bitter citrus juice. J FOOD PROCESS ENG 2023. [DOI: 10.1111/jfpe.14265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Arun Kumar Gupta
- Department of Food Engineering and Technology Tezpur University Tezpur Assam India
- Department of Life Sciences (Food Technology) Graphic Era (Deemed to be) University Dehradun Uttarakhand India
| | - Muzamil Ahmad Rather
- Department of Molecular Biology and Biotechnology Tezpur University Tezpur Assam India
| | - Poonam Mishra
- Department of Food Engineering and Technology Tezpur University Tezpur Assam India
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Bioconversion of Glycerol into Lactic Acid by a New Bacterial Strain from the Brazilian Cerrado Soil. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation8100477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A lactic-acid-producing strain was isolated from the Brazilian Cerrado soil (Brazilian savanna). Glycerol, a byproduct of the biodiesel industry, can be converted into various chemical intermediates of industrial value by biotechnological routes. Klebsiella pneumoniae can metabolize glycerol in environments with or without oxygen and bioconvert it into several chemicals with high value-added, such as lactic acid, 3-hydroxypropionic acid and 1,3 propanediol. The wild-type bacterial strain (2GPP) isolated from a soil sample from the Brazilian Cerrado was determined to be a K. pneumoniae complex that was capable of successfully metabolizing glycerol. Fermentations were performed with different temperatures, pH, and inoculum concentrations to evaluate the best lactic acid production. At first, 1,3-propanediol and L-(+)-lactic acid were produced in mini reactors. A lactic acid production of 3.8 g·L−1 and a decrease in 1,3-propanediol output were observed. Thus, by adjusting process variables such as pH and temperature during fermentation, it was possible to maximize the production of lactic acid and decrease the formation of 1,3-propanediol by utilizing experimental design strategies.
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Wang XL, Zhou JJ, Liu S, Sun YQ, Xiu ZL. In situ carbon dioxide capture to co-produce 1,3-propanediol, biohydrogen and micro-nano calcium carbonate from crude glycerol by Clostridium butyricum. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2022; 15:91. [PMID: 36057610 PMCID: PMC9440576 DOI: 10.1186/s13068-022-02190-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 08/26/2022] [Indexed: 11/30/2022]
Abstract
Background Climate change caused by greenhouse gas emission has become a global hot topic. Although biotechnology is considered as an environmentally friendly method to produce chemicals, almost all biochemicals face carbon dioxide emission from inevitable respiration and energy metabolism of most microorganisms. To cater for the broad prospect of biochemicals, bioprocess optimization of diverse valuable products is becoming increasingly important for environmental sustainability and cleaner production. Based on Ca(OH)2 as a CO2 capture agent and pH regulator, a bioprocess was proposed for co-production of 1,3-propanediol (1,3-PDO), biohydrogen and micro-nano CaCO3 by Clostridium butyricum DL07. Results In fed-batch fermentation, the maximum concentration of 1,3-PDO reached up to 88.6 g/L with an overall productivity of 5.54 g/L/h. This productivity is 31.9% higher than the highest value previously reports (4.20 g/L/h). In addition, the ratio of H2 to CO2 in exhaust gas showed a remarkable 152-fold increase in the 5 M Ca(OH)2 group compared to 5 M NaOH as the CO2 capture agent. Green hydrogen in exhaust gas ranged between 17.2% and 20.2%, with the remainder being N2 with negligible CO2 emissions. During CO2 capture in situ, micro-nano calcite particles of CaCO3 with sizes in the range of 300 nm to 20 µm were formed simultaneously. Moreover, when compared with 5M NaOH group, the concentrations of soluble salts and proteins in the fermentation broth of 5 M Ca(OH)2 group were notably reduced by 53.6% and 44.1%, respectively. The remarkable reduction of soluble salts and proteins would contribute to the separation of 1,3-PDO. Conclusions Ca(OH)2 was used as a CO2 capture agent and pH regulator in this study to promote the production of 1,3-PDO. Meanwhile, micro-nano CaCO3 and green H2 were co-produced. In addition, the soluble salts and proteins in the fermentation broth were significantly reduced. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13068-022-02190-2.
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Optimization of an Alkaline Hydrolysis Preparation of Capilliposide-A from Lysimachia capillipes Hemsl. Using Response Surface Methodology Coupled with HPLC-ELSD Analysis. Chromatographia 2022. [DOI: 10.1007/s10337-021-04124-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Wang Q, Li H, Feng K. Effect of honeycomb, granular, and powder activated carbon additives on continuous lactic acid fermentation of complex food waste with mixed inoculation. J Biosci Bioeng 2021; 131:655-662. [PMID: 33775543 DOI: 10.1016/j.jbiosc.2021.02.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 02/25/2021] [Accepted: 02/26/2021] [Indexed: 01/31/2023]
Abstract
To accelerate and stabilize lactic acid fermentation from food waste, three types of activated carbon, including honeycomb activated carbon, granular activated carbon, and powder activated carbon, were tested as additives in continuous food waste fermentation processes. The results showed that carbohydrate was the primary substrate for lactic acid production, but its conversion reached a high, stable level after a long period of microbial acclimation in the control system. Activated carbon, especially honeycomb activated carbon accelerated the stabilization of lactic acid fermentation and enhanced the tolerance of fermentation systems to a hostile and fluctuating environment. The addition of activated carbon increased the oxidation-reduction potential to approximately 100 mV and altered the microbial communities. Homolactic fermentation bacteria were dominant in all the systems, and the honeycomb activated carbon addition stimulated the growth of unclassified Lactobacillus and immobilized Lactobacillus panis with strong carbohydrate metabolism. In addition, powder activated carbon enhanced the degradation of protein due to the multiplying Pseudomonas. At the stable stage, the organic conversion rates were close in the control system and the systems with the activated carbon addition, and the lactic acid concentrations in these systems remained at 8000-10,000 mg/L. Considering the cost of the additives, honeycomb activated carbon is a good choice to stabilize lactic acid production from food waste.
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Affiliation(s)
- Qiao Wang
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Huan Li
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
| | - Kai Feng
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
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Wang XL, Zhou JJ, Shen JT, Zheng YF, Sun YQ, Xiu ZL. Sequential fed-batch fermentation of 1,3-propanediol from glycerol by Clostridium butyricum DL07. Appl Microbiol Biotechnol 2020; 104:9179-9191. [PMID: 32997204 DOI: 10.1007/s00253-020-10931-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 08/30/2020] [Accepted: 09/23/2020] [Indexed: 12/17/2022]
Abstract
The demand for 1,3-propanediol (1,3-PDO) has increased sharply due to its role as a monomer for the synthesis of polytrimethylene terephthalate (PTT). Although Clostridium butyricum is considered to be one of the most promising bioproducers for 1,3-PDO, its low productivity hinders its application on industrial scale because of the longer time needed for anaerobic cultivation. In this study, an excellent C. butyricum (DL07) strain was obtained with high-level titer and productivity of 1,3-PDO, i.e., 104.8 g/L and 3.38 g/(L•h) vs. 94.2 g/L and 3.04 g/(L•h) using pure or crude glycerol as substrate in fed-batch fermentation, respectively. Furthermore, a novel sequential fed-batch fermentation was investigated, in which the next bioreactor was inoculated by C. butyricum DL07 cells growing at exponential phase in the prior bioreactor. It could run steadily for at least eight cycles. The average concentration of 1,3-PDO in eight cycles was 85 g/L with the average productivity of 3.1 g/(L•h). The sequential fed-batch fermentation could achieve semi-continuous production of 1,3-PDO with higher productivity than repeated fed-batch fermentation and would greatly contribute to the industrial production of 1,3-PDO by C. butyricum. KEY POINTS: • A novel C. butyricum strain was screened to produce 104.8 g/L 1,3-PDO from glycerol. • Corn steep liquor powder was used as a cheap nitrogen source for 1,3-PDO production. • A sequential fed-batch fermentation process was established for 1,3-PDO production. • An automatic glycerol feeding strategy was applied in the production of 1,3-PDO.
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Affiliation(s)
- Xiao-Li Wang
- School of Bioengineering, Dalian University of Technology, Dalian, 116024, Liaoning Province, People's Republic of China
| | - Jin-Jie Zhou
- School of Bioengineering, Dalian University of Technology, Dalian, 116024, Liaoning Province, People's Republic of China
| | - Jun-Tao Shen
- School of Bioengineering, Dalian University of Technology, Dalian, 116024, Liaoning Province, People's Republic of China
| | - Ya-Feng Zheng
- School of Bioengineering, Dalian University of Technology, Dalian, 116024, Liaoning Province, People's Republic of China
| | - Ya-Qin Sun
- School of Bioengineering, Dalian University of Technology, Dalian, 116024, Liaoning Province, People's Republic of China
| | - Zhi-Long Xiu
- School of Bioengineering, Dalian University of Technology, Dalian, 116024, Liaoning Province, People's Republic of China.
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Zhang AH, Zhu KY, Zhuang XY, Liao LX, Huang SY, Yao CY, Fang BS. A robust soft sensor to monitor 1,3-propanediol fermentation process by Clostridium butyricum based on artificial neural network. Biotechnol Bioeng 2020; 117:3345-3355. [PMID: 32678455 DOI: 10.1002/bit.27507] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 07/15/2020] [Indexed: 02/02/2023]
Abstract
With the aggravation of environmental pollution and energy crisis, the sustainable microbial fermentation process of converting glycerol to 1,3-propanediol (1,3-PDO) has become an attractive alternative. However, the difficulty in the online measurement of glycerol and 1,3-PDO creates a barrier to the fermentation process and then leads to the residual glycerol and therefore, its wastage. Thus, in the present study, the four-input artificial neural network (ANN) model was developed successfully to predict the concentration of glycerol, 1,3-PDO, and biomass with high accuracy. Moreover, an ANN model combined with a kinetic model was also successfully developed to simulate the fed-batch fermentation process accurately. Hence, a soft sensor from the ANN model based on NaOH-related parameters has been successfully developed which cannot only be applied in software to solve the difficulty of glycerol and 1,3-PDO online measurement during the industrialization process, but also offer insight and reference for similar fermentation processes.
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Affiliation(s)
- Ai-Hui Zhang
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, China
| | - Kai-Yi Zhu
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, China
| | - Xiao-Yan Zhuang
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, China
| | - Lang-Xing Liao
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, China
| | - Shi-Yang Huang
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, China
| | - Chuan-Yi Yao
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, China.,The Key Lab for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, Fujian, China
| | - Bai-Shan Fang
- Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian, China.,The Key Lab for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, Fujian, China.,The Key Laboratory for Chemical Biology of Fujian Province, Xiamen University, Xiamen, Fujian, China.,The National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, Xiamen University, Xiamen, Fujian, China
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11
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Clostridium sp. as Bio-Catalyst for Fuels and Chemicals Production in a Biorefinery Context. Catalysts 2019. [DOI: 10.3390/catal9110962] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Clostridium sp. is a genus of anaerobic bacteria capable of metabolizing several substrates (monoglycerides, diglycerides, glycerol, carbon monoxide, cellulose, and more), into valuable products. Biofuels, such as ethanol and butanol, and several chemicals, such as acetone, 1,3-propanediol, and butyric acid, can be produced by these organisms through fermentation processes. Among the most well-known species, Clostridium carboxidivorans, C. ragsdalei, and C. ljungdahlii can be highlighted for their ability to use gaseous feedstocks (as syngas), obtained from the gasification or pyrolysis of waste material, to produce ethanol and butanol. C. beijerinckii is an important species for the production of isopropanol and butanol, with the advantage of using hydrolysate lignocellulosic material, which is produced in large amounts by first-generation ethanol industries. High yields of 1,3 propanediol by C. butyricum are reported with the use of another by-product from fuel industries, glycerol. In this context, several Clostridium wild species are good candidates to be used as biocatalysts in biochemical or hybrid processes. In this review, literature data showing the technical viability of these processes are presented, evidencing the opportunity to investigate them in a biorefinery context.
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Zhang A, Huang S, Zhuang X, Wang K, Yao C, Fang B. A novel kinetic model to describe 1,3‐propanediol production fermentation by
Clostridium butyricum. AIChE J 2019. [DOI: 10.1002/aic.16587] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Ai‐Hui Zhang
- Dept. of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering Xiamen University Xiamen China
| | - Shi‐Yang Huang
- Dept. of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering Xiamen University Xiamen China
| | - Xiao‐Yan Zhuang
- Dept. of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering Xiamen University Xiamen China
| | - Ke Wang
- Dept. of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering Xiamen University Xiamen China
| | - Chuan‐Yi Yao
- Dept. of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering Xiamen University Xiamen China
- The Key Lab for Synthetic Biotechnology of Xiamen City Xiamen University Xiamen Fujian China
| | - Bai‐Shan Fang
- Dept. of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering Xiamen University Xiamen China
- The Key Lab for Synthetic Biotechnology of Xiamen City Xiamen University Xiamen Fujian China
- The National Engineering Laboratory for Green Chemical Productions of Alcohols‐Ethers‐Esters Xiamen University Xiamen Fujian China
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Wang XL, Zhou JJ, Sun YQ, Xiu ZL. Bioconversion of Raw Glycerol From Waste Cooking-Oil-Based Biodiesel Production to 1,3-Propanediol and Lactate by a Microbial Consortium. Front Bioeng Biotechnol 2019; 7:14. [PMID: 30834245 PMCID: PMC6387908 DOI: 10.3389/fbioe.2019.00014] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 01/18/2019] [Indexed: 01/04/2023] Open
Abstract
Waste cooking oil (WCO) is a sustainable alternative to raw vegetable oils and fats for biodiesel production considering both environmental and economic benefits. Raw glycerol from WCO-based biodiesel production (GWCO) is difficult to utilize via biological method, as multiple toxic impurities have inhibitory effects on microbial growth especially for pure cultures. In this work, four microbial consortia were selected from activated sludge by 30 serial transfers under different conditions. The obtained consortia exhibited lower diversity and species difference with the transfers. The consortium LS30 exhibited unique advantages for bioconversion of GWCO to 1,3-propanediol (1,3-PDO) and lactate (LA). Moreover, the fermentation could be performed economically under microaerobic and non-sterile conditions. The consortium consisted of 57.97% Enterobacter and 39.25% Escherichia could effectively convert 60 g/L GWCO to 1,3-PDO and LA in batch fermentation. In addition, this consortium exhibited better tolerance to fatty acid-derived crude glycerol (100 g/L), which demonstrated that specific toxic impurities in GWCO did pose a great challenge to microbial growth and metabolism. In fed batch fermentation, 27.77 g/L 1,3-PDO and 14.68 g/L LA were achieved. Compared with the consortium, a long lag phase in cell growth associated with a decreased glycerol consumption was observed in four single-strain fermentations. Furthermore, neither the consortium DL38 with excellent glycerol tolerance nor consortium C2-2M with high yield of 1,3-PDO could effectively transform GWCO into valuable products. The results demonstrated that the selected microbial consortium has the advanced adaptability to the toxic impurities in GWCO compared with other reported consortia and isolated single strain. This process can contribute to added-value use of GWCO.
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Affiliation(s)
| | | | | | - Zhi-Long Xiu
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China
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Fu Y, Zhang J, Chen K, Xiao C, Fan L, Zhang B, Ren J, Fang B. An in vitro fermentation study on the effects of Dendrobium officinale polysaccharides on human intestinal microbiota from fecal microbiota transplantation donors. J Funct Foods 2019. [DOI: 10.1016/j.jff.2018.12.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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Zhang AH, Zhuang XY, Chen KN, Huang SY, Xu CZ, Fang BS. Adaptive evolution of Clostridium butyricum
and scale-Up for high-Concentration 1,3-propanediol production. AIChE J 2018. [DOI: 10.1002/aic.16425] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ai-Hui Zhang
- Dept. of Chemical and Biochemical Engineering; College of Chemistry and Chemical Engineering, Xiamen University; Xiamen Fujian 361005 China
| | - Xiao-Yan Zhuang
- Dept. of Chemical and Biochemical Engineering; College of Chemistry and Chemical Engineering, Xiamen University; Xiamen Fujian 361005 China
| | - Kai-Nan Chen
- Dept. of Chemical and Biochemical Engineering; College of Chemistry and Chemical Engineering, Xiamen University; Xiamen Fujian 361005 China
| | - Shi-Yang Huang
- Dept. of Chemical and Biochemical Engineering; College of Chemistry and Chemical Engineering, Xiamen University; Xiamen Fujian 361005 China
| | - Chao-Zhen Xu
- Dept. of Chemical and Biochemical Engineering; College of Chemistry and Chemical Engineering, Xiamen University; Xiamen Fujian 361005 China
| | - Bai-Shan Fang
- Dept. of Chemical and Biochemical Engineering; College of Chemistry and Chemical Engineering, Xiamen University; Xiamen Fujian 361005 China
- The Key Lab for Synthetic Biotechnology of Xiamen City; Xiamen University; Xiamen Fujian 361005 China
- The National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters; Xiamen University; Xiamen Fujian 361005 China
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Zhang L, Bao W, Wei R, Fu S, Gong H. Inactivating NADH:quinone oxidoreductases affects the growth and metabolism of Klebsiella pneumoniae. Biotechnol Appl Biochem 2018; 65:857-864. [PMID: 30063071 DOI: 10.1002/bab.1684] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 07/22/2018] [Indexed: 11/10/2022]
Abstract
NADH:quinone oxidoreductases (NQOs) act as the electron entry sites in bacterial respiration and oxidize intracellular NADH that is essential for the synthesis of numerous molecules. Klebsiella pneumoniae contains three NQOs (NDH-1, NDH-2, and NQR). The effects of inactivating these NQOs, separately and together, on cell metabolism were investigated under different culture conditions. Defective growth was evident in NDH-1-NDH-2 double and NDH-1-NDH-2-NQR triple deficient mutants, which was probably due to damage to the respiratory chain. The results also showed that K. pneumoniae can flexibly use NQOs to maintain normal growth in single NQO-deficient mutants. And more interestingly, under aerobic conditions, inactivating NDH-1 resulted in a high intracellular NADH:NAD+ ratio, which was proven to be beneficial for 2,3-butanediol production. Compared with the parent strain, 2,3-butanediol production by the NDH-1-deficient mutant was increased by 46% and 62% in glycerol- and glucose-based media, respectively. Thus, our findings provide a practical strategy for metabolic engineering of respiratory chains to promote the biosynthesis of 2,3-butanediol in K. pneumoniae.
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Affiliation(s)
- Lijuan Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, People's Republic of China
| | - Wenjing Bao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, People's Republic of China
| | - Renquan Wei
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, People's Republic of China
| | - Shuilin Fu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, People's Republic of China
| | - Heng Gong
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, People's Republic of China
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