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Advanced Monitoring and Control of Redox Potential in Wine Fermentation across Scales. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation9010007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Combined with real-time monitoring of density and temperature, the control of the redox potential provides a new approach to influencing cell metabolism during growth, cell viability and non-growing yeast activity in wine fermentations. Prior research indicates that the problem of sluggish and incomplete fermentation can be alleviated by maintaining a constant redox potential during the ethanol fermentation. A secondary trait of hydrogen sulfide formation from elemental sulfur also seems to be associated with the development of low redox potentials during fermentation and this might be prevented by the deliberate control of redox potentials in a certain range. While the control of the redox potential during wine fermentations has been demonstrated previously at the research scale (100 L), the ability to control it in larger volumes typically seen in commercial conditions remained unanswered. Wine fermentations from the same load of Cabernet Sauvignon grapes from the 2021 harvest were conducted at three volumes: 100 L and 1500 L in a research winery and 10,000 L in a commercial winery. Using only pulses of air delivery, the redox potential was successfully controlled to −40 mV referenced to a silver/silver chloride electrode throughout the fermentations, at all scales. This appears to be the first published result of a controlled fermentation trial that includes the commercial scale and demonstrates the scalability of control of redox potential in wine fermentations.
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Xue SJ, Zhang JR, Zhang RX, Qin Y, Yang XB, Jin GJ, Tao YS. Oxidation-reduction potential affects medium-chain fatty acid ethyl ester production during wine alcohol fermentation. Food Res Int 2022; 157:111369. [DOI: 10.1016/j.foodres.2022.111369] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 05/04/2022] [Accepted: 05/10/2022] [Indexed: 12/24/2022]
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Lamour J, Wan C, Zhang M, Zhao X, Den Haan R. Overexpression of endogenous stress-tolerance related genes in Saccharomyces cerevisiae improved strain robustness and production of heterologous cellobiohydrolase. FEMS Yeast Res 2020; 19:5479884. [PMID: 31073597 DOI: 10.1093/femsyr/foz035] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 04/25/2019] [Indexed: 12/11/2022] Open
Abstract
To enable Saccharomyces cerevisiae to produce renewable fuels from lignocellulose in a consolidated bioprocess, a heterologous cellulase system must be engineered into this yeast. In addition, inherently low secretion titers and sensitivity to adverse environmental conditions must be overcome. Here, two native S. cerevisiae genes related to yeast stress tolerance, YHB1 and SET5, were overexpressed under transcriptional control of the constitutive PGK1 promoter and their effects on heterologous secretion of Talaromyces emersonii cel7A cellobiohydrolase was investigated. Transformants showed increased secreted enzyme activity that ranged from 22% to 55% higher compared to the parental strains and this did not lead to deleterious growth effects. The recombinant strains overexpressing either YHB1 or SET5 also demonstrated multi-tolerant characteristics desirable in bioethanol production, i.e. improved tolerance to osmotic and heat stress. Quantitative reverse transcriptase PCR analysis in these strains showed decreased transcription of secretion pathway genes. However, decreased unfolded protein response was also observed, suggesting novel mechanisms for enhancing enzyme production through stress modulation. Overexpression of YHB1 in an unrelated diploid strain also enhanced stress tolerance and improved ethanol productivity in medium containing acetic acid. To our knowledge, this is the first demonstration that improved heterologous secretion and environmental stress tolerance could be engineered into yeast simultaneously.
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Affiliation(s)
- Jarryd Lamour
- Department of Biotechnology, University of the Western Cape, Bellville 7530, South Africa
| | - Chun Wan
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Mingming Zhang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xinqing Zhao
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Riaan Den Haan
- Department of Biotechnology, University of the Western Cape, Bellville 7530, South Africa
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Ma H, Yang J, Jia Y, Wang Q, Ma X, Sonomoto K. Alleviation of harmful effect in stillage reflux in food waste ethanol fermentation based on metabolic and side-product accumulation regulation. BIORESOURCE TECHNOLOGY 2016; 218:463-468. [PMID: 27394991 DOI: 10.1016/j.biortech.2016.06.123] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 06/28/2016] [Accepted: 06/29/2016] [Indexed: 06/06/2023]
Abstract
Stillage reflux fermentation in food waste ethanol fermentation could reduce sewage discharge but exert a harmful effect because of side-product accumulation. In this study, regulation methods based on metabolic regulation and side-product alleviation were conducted. Result demonstrated that controlling the proper oxidation-reduction potential value (-150mV to -250mV) could reduce the harmful effect, improve ethanol yield by 21%, and reduce fermentation time by 20%. The methods of adding calcium carbonate to adjust the accumulated lactic acid showed that ethanol yield increased by 17.3%, and fermentation time decreased by 20%. The accumulated glyceal also shows that these two methods can reduce the harmful effect. Fermentation time lasted for seven times without effect, and metabolic regulation had a better effect than side-product regulation.
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Affiliation(s)
- Hongzhi Ma
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China.
| | - Jian Yang
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China
| | - Yan Jia
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China
| | - Qunhui Wang
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China
| | - Xiaoyu Ma
- Department of Environmental Engineering, University of Science and Technology Beijing, 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China
| | - Kenji Sonomoto
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
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Ma H, Yang J, Jia Y, Wang Q, Tashiro Y, Sonomoto K. Stillage reflux in food waste ethanol fermentation and its by-product accumulation. BIORESOURCE TECHNOLOGY 2016; 209:254-258. [PMID: 26974357 DOI: 10.1016/j.biortech.2016.02.127] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 02/20/2016] [Accepted: 02/27/2016] [Indexed: 06/05/2023]
Abstract
Raw materials and pollution control are key issues for the ethanol fermentation industry. To address these concerns, food waste was selected as fermentation substrate, and stillage reflux was carried out in this study. Reflux was used seven times during fermentation. Corresponding ethanol and reducing sugar were detected. Accumulation of by-products, such as organic acid, sodium chloride, and glycerol, was investigated. Lactic acid was observed to accumulate up to 120g/L, and sodium chloride reached 0.14mol/L. Other by-products did not accumulate. The first five cycles of reflux increased ethanol concentration, which prolonged fermentation time. Further increases in reflux time negatively influenced ethanol fermentation. Single-factor analysis with lactic acid and sodium chloride demonstrated that both factors affected ethanol fermentation, but lactic acid induced more effects.
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Affiliation(s)
- Hongzhi Ma
- Department of Environmental Engineering, University of Science and Technology, Beijing 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China
| | - Jian Yang
- Department of Environmental Engineering, University of Science and Technology, Beijing 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China
| | - Yan Jia
- Department of Environmental Engineering, University of Science and Technology, Beijing 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China
| | - Qunhui Wang
- Department of Environmental Engineering, University of Science and Technology, Beijing 100083, China; Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing, China
| | - Yukihiro Tashiro
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| | - Kenji Sonomoto
- Department of Bioscience and Biotechnology, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
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Chen Z, Zheng Z, Yi C, Wang F, Niu Y, Li H. Intracellular metabolic changes in Saccharomyces cerevisiae and promotion of ethanol tolerance during the bioethanol fermentation process. RSC Adv 2016. [DOI: 10.1039/c6ra19254h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
During the batch bioethanol fermentation process, although Saccharomyces cerevisiae cells are challenged by accumulated ethanol, our previous work showed that the ethanol tolerance of S. cerevisiae increased as fermentation time increased.
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Affiliation(s)
- Ze Chen
- Beijing Key Laboratory of Bioprocess
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Zhou Zheng
- Key Laboratory of Marine Bioactive Substance
- The First Institute of Oceanography
- State Oceanic Administration (SOA)
- Qingdao 266061
- China
| | - Chenfeng Yi
- Beijing Key Laboratory of Bioprocess
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Fenglian Wang
- Beijing Key Laboratory of Bioprocess
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Yuanpu Niu
- Beijing Key Laboratory of Bioprocess
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Hao Li
- Beijing Key Laboratory of Bioprocess
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing 100029
- China
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Wang FS, Yang MY, Chen ML. Optimal Temperature and pH Control for a Batch Simultaneous Saccharification and Co-Fermentation Process. CHEM ENG COMMUN 2015. [DOI: 10.1080/00986445.2014.886200] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Gao J, Yuan W, Li Y, Xiang R, Hou S, Zhong S, Bai F. Transcriptional analysis of Kluyveromyces marxianus for ethanol production from inulin using consolidated bioprocessing technology. BIOTECHNOLOGY FOR BIOFUELS 2015; 8:115. [PMID: 26273319 PMCID: PMC4535673 DOI: 10.1186/s13068-015-0295-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 07/24/2015] [Indexed: 05/07/2023]
Abstract
BACKGROUND Ethanol production from non-crop materials, such as Jerusalem artichokes, would make a great contribution to the energy industry. The non-conventional yeast, Kluyveromyces marxianus, is able to carry out ethanol fermentation of sugar molecules obtained from inulin-containing materials by consolidated bioprocessing. Lower inulin concentrations and micro-aeration can lead to a relatively fast and ideal fermentation process; however, it is unclear what causes the inhibition of higher concentrations of inulin and the promotion effect of aeration. RESULTS Next-generation sequencing technology was used to study the global transcriptional response of K. marxianus Y179 under three fermentation conditions, including 120 g/L inulin without aeration (120-N), 230 g/L inulin without aeration (230-N), 230 g/L inulin with aeration by ORP controlling at -130 mV (230-130mV). A total of 35.55 million clean reads were generated from three samples, of which 4,820 predicted that open reading frames were annotated. For differential expression analysis, 950 and 1,452 differentially expressed genes were discovered under the conditions of 230-130mV and 120-N, respectively, and the sample 230-N was used as the control. These genes are mainly associated with the pathways of central carbon metabolism and ethanol formation. Increased expression of inulinase and the low activity of the autophagy-related gene, ATG8, ensured fast and ideal fermentation processes. CONCLUSIONS Despite being reported as the "crabtree-negative" species, K. marxianus Y179 could achieve favorable ethanol fermentation profiles under micro-aeration and high inulin concentrations. K. marxianus Y179 cells responded to inulin concentrations and micro-aeration that is involved in the whole ethanol metabolism network. These results will serve as an important foundation for further exploration of the regulatory mechanisms involved in ethanol fermentation from inulin by consolidated bioprocessing and also provide a valuable reference for future studies on optimization and reconstruction of the metabolism network in K. marxianus.
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Affiliation(s)
- Jiaoqi Gao
- />School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Wenjie Yuan
- />School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Yimin Li
- />School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Ruijuan Xiang
- />School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Shengbo Hou
- />School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Shijun Zhong
- />School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
| | - Fengwu Bai
- />School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024 China
- />School of Life Science and Biotechnology, Shanghai Jiaotong University, Shanghai, 200240 China
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Park TH, Chen GGQ. Editorial: Biotechnology Journal in Asia - the first official AFOB special issue. Biotechnol J 2014; 8:1246-8. [PMID: 24591182 DOI: 10.1002/biot.201300415] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The first AFOB special issue of Biotechnology Journal is edited by Prof. Tai Hyun Park and Prof. George G. Q. Chen. The eleven articles are representative of the diverse nature of biotechnology today, covering topics such as microfluidic devices, high-throughput analysis, biosensors, bio-imaging, tissue engineering, vaccination, gene delivery, gene expression, and cell-free protein synthesis.
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Affiliation(s)
- Tai Hyun Park
- President of Advanced Institutes of Convergence Technology (AICT), Professor of School of Chemical and Biological Engineering, Seoul National University, Seoul, Republic of Korea.
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