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Li Y, Yan Y, Chen J, Zhang Z, Hu W. Enhancement effect of l-cysteine on lactic acid fermentation production. Biotechnol J 2023; 18:e2300110. [PMID: 37533375 DOI: 10.1002/biot.202300110] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 07/11/2023] [Accepted: 08/01/2023] [Indexed: 08/04/2023]
Abstract
BACKGROUND Environmental stress resistance is still a bottleneck for economical process for l-lactic acid fermentation. Chronological lifespan (CLS) extension has represented a promising strategy for improving stress resistance of microbial cell factories. MAIN METHODS AND MAJOR RESULTS In this study, addition of anti-aging drug cysteine, a kind of extending CLS of microbial cell factories, was systematically evaluated on cell viability and l-lactic acid production in Bacillus coagulans CICC 23843. The results revealed that 16 mm l-cysteine supplement significantly improved l-lactic acid titer in B. coagulans. The enhanced total antioxidant capacity (T-AOC) and key enzymes activities involving in glycolytic pathway as well as differentially expressed genes involved in cysteine synthesize and cysteine precursor synthesize pathways, and fatty acid degradation pathway may help to further understand the relative mechanism of l-cysteine effect on improving l-lactic acid accumulation. Finally, based on 16 mm l-cysteine supplement, a final l-lactic acid titer of 130.5 g L-1 with l-lactic acid productivity of 4.07 g L-1 h-1 and the conversion rate of 0.94 g g-1 total sugar was achieved in a 5 L bioreactor. CONCLUSIONS AND IMPLICATIONS This study provided a valuable option for engineering lactic acid bacteria lifespan for enhancement of lactic acid yield.
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Affiliation(s)
- Yongda Li
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, P.R. China
| | - Yongli Yan
- Department of Biophysics, Institute of Modern Physics, Chinese, Academy of Sciences, Lanzhou, P.R. China
- University of Chinese Academy of Sciences, Beijing, P.R. China
| | - Jihong Chen
- Department of Biophysics, Institute of Modern Physics, Chinese, Academy of Sciences, Lanzhou, P.R. China
- University of Chinese Academy of Sciences, Beijing, P.R. China
| | - Zhen Zhang
- College of Food Science and Engineering, Gansu Agricultural University, Lanzhou, P.R. China
| | - Wei Hu
- Department of Biophysics, Institute of Modern Physics, Chinese, Academy of Sciences, Lanzhou, P.R. China
- University of Chinese Academy of Sciences, Beijing, P.R. China
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2
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Zhang X, Liu X, Zhang N, Zhao X, Li Y, Gong D, Yun Y. Development of chemically defined media for Lactococcus lactis subsp. lactis YF11 to eliminate the influence of hyperosmotic stress. 3 Biotech 2023; 13:375. [PMID: 37873496 PMCID: PMC10590357 DOI: 10.1007/s13205-023-03788-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 09/24/2023] [Indexed: 10/25/2023] Open
Abstract
Chemically defined media (CDM) can eliminate or lessen the interference that occurs in complex culture media (CCM) caused by the undefined substrate pools, and various CDM have been designed and employed for investigating microbial physiology and multiomics. Herein, using the measured amount of total amino acids in CCM and combined with the in vivo and in vitro amino acid content of Lactococcus lactis subsp. lactis YF11, new enriched CDM were designed and then optimized using a statistical design-of-experiment method coupling with fed-batch fermentation to eliminate or lessen the influence of hyperosmotic pressure. Cell volume was introduced as a target index to assess the performance of CDM, and average osmotic pressure (AOP) was employed to describe the osmotic pressure of CDM. The AOP was significantly decreased from 610 mOsm/kg·H2O in the initial CDM (I-CDM) to 360 mOsm/kg·H2O in fed-batch CDM (F-CDM), and the cell volume was increased from 0.142 ± 0.004 μm3 in I-CDM to 0.198 ± 0.008 μm3 in F-CDM, which was close to 0.206 ± 0.005 μm3 found in CCM, indicating that the strategy of designing and improving CDM followed by a statistical design-of-experiment coupling with fed-batch cultivation presented a promising pathway for extensive utilization of CDM. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-023-03788-5.
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Affiliation(s)
- Xiaoli Zhang
- Inner Mongolia Key Laboratory of Biomass-Energy Conversion, School of Life Science and Technology, Inner Mongolia University of Science and Technology, 7 Aerding Street, Baotou, 014010 People’s Republic of China
| | - Xiaodan Liu
- Inner Mongolia Key Laboratory of Biomass-Energy Conversion, School of Life Science and Technology, Inner Mongolia University of Science and Technology, 7 Aerding Street, Baotou, 014010 People’s Republic of China
| | - Nan Zhang
- Inner Mongolia Key Laboratory of Biomass-Energy Conversion, School of Life Science and Technology, Inner Mongolia University of Science and Technology, 7 Aerding Street, Baotou, 014010 People’s Republic of China
| | - Xinru Zhao
- Inner Mongolia Key Laboratory of Biomass-Energy Conversion, School of Life Science and Technology, Inner Mongolia University of Science and Technology, 7 Aerding Street, Baotou, 014010 People’s Republic of China
| | - Yali Li
- Inner Mongolia Key Laboratory of Biomass-Energy Conversion, School of Life Science and Technology, Inner Mongolia University of Science and Technology, 7 Aerding Street, Baotou, 014010 People’s Republic of China
| | - Donghui Gong
- Inner Mongolia Key Laboratory of Biomass-Energy Conversion, School of Life Science and Technology, Inner Mongolia University of Science and Technology, 7 Aerding Street, Baotou, 014010 People’s Republic of China
| | - Yueying Yun
- Inner Mongolia Key Laboratory of Biomass-Energy Conversion, School of Life Science and Technology, Inner Mongolia University of Science and Technology, 7 Aerding Street, Baotou, 014010 People’s Republic of China
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3
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Yuan X, Cao J, Wang R, Han Y, Zhu J, Lin J, Yang L, Wu M. Genetically Engineering Escherichia coli to Produce Xylitol from Corncob Hydrolysate without Lime Detoxification. Molecules 2023; 28:1550. [PMID: 36838538 PMCID: PMC9967598 DOI: 10.3390/molecules28041550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 02/02/2023] [Accepted: 02/03/2023] [Indexed: 02/09/2023] Open
Abstract
Before fermentation with hemicellulosic hydrolysate as a substrate, it is generally necessary to detoxify the toxic substances that are harmful to microorganism growth. Cyclic AMP receptor protein (CRP) is a global regulator, and mutation of its key sites may have an important impact on E. coli virulence tolerance. Using corncob hydrolysate without ion-exchange or lime detoxification as the substrate, shake flask fermentation experiments showed that CRP mutant IS5-dG (I112L, T127G, A144T) produced 18.4 g/L of xylitol within 34 h, and the OD600 was 9.7 at 24 h; these values were 41.5% and 21.3% higher than those of the starting strain, IS5-d, respectively. This mutant produced 82 g/L of xylitol from corncob hydrolysate without ion-exchange or lime detoxification during fed-batch fermentation in a 15-L bioreactor, with a productivity of 1.04 g/L/h; these values were 173% and 174% higher than the starting strain, respectively. To our knowledge, this is the highest xylitol concentration and productivity produced by microbial fermentation using completely non-detoxified hemicellulosic hydrolysate as the substrate to date. This study also showed that alkali neutralization, high temperature sterilization, and fermentation of the hydrolysate had important effects on the xylose loss rate and xylitol production.
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Affiliation(s)
- Xinsong Yuan
- School of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230601, China
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jiyun Cao
- School of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230601, China
| | - Rui Wang
- School of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230601, China
| | - Yu Han
- School of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230601, China
| | - Jinmiao Zhu
- School of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230601, China
| | - Jianping Lin
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
- Ningbo Research Institute, Zhejiang University, Ningbo 315100, China
| | - Lirong Yang
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Mianbin Wu
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
- Ningbo Research Institute, Zhejiang University, Ningbo 315100, China
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4
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Royan M, Seighalani R, Mortezaei F, Pourebrahim M. In vitro assessment of safety and functional probiotic properties of Lactobacillus mucosae strains isolated from Iranian native ruminants intestine. ITALIAN JOURNAL OF ANIMAL SCIENCE 2021. [DOI: 10.1080/1828051x.2021.1947908] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Maryam Royan
- North Region Branch, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran
| | - Ramin Seighalani
- North Region Branch, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran
| | - Faezeh Mortezaei
- Fisheries Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran
| | - Moslem Pourebrahim
- North Region Branch, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran
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5
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Use of Corn-Steep Water Effluent as a Promising Substrate for Lactic Acid Production by Enterococcus faecium Strain WH51-1. FERMENTATION-BASEL 2021. [DOI: 10.3390/fermentation7030111] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Various challenges facing the industrial production of bio-based lactic acid (LA) such as cost of raw materials and nitrogen sources, as well as contamination risk by mesophilic and neutrophilic producers, should be overcome for the commercial production. This study aimed to investigate the feasibility of corn steep water (CSW) as a raw material for LA production using a newly thermo-alkali-tolerant lactic acid bacterium. The physicochemical characteristics of CSW were investigated. The high carbohydrates, proteins, amino acids, vitamins, essential elements, minerals, and non-protein nitrogenous compounds content confirmed that the CSW is a promising substrate for LA production. Out of 67 bacterial isolates, Enterococcus faecium WH51-1 was selected based on its tolerance to high temperatures and inhibitory compounds (sodium metabisulfate, sodium chloride, sodium acetate, and formic acid). Fermentation factors including sugar concentration, temperature, inoculum size, and neutralizing agents were optimized for LA production. Lactic acid concentration of about 44.6 g/L with a high yield (0.89 ± 0.02 g/g) was obtained using 60 g/L of CSW sugar, inoculum size 10% (v/v), 45 °C, and sodium hydroxide or calcium carbonate as a neutralizing agent. These results demonstrated the potential of strain WH51-1 for LA production using CSW effluent as raw material.
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6
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Li J, Shi S, Wang Y, Jiang Z. Integrated production of optically pure l-lactic acid from paper mill sludge by simultaneous saccharification and co-fermentation (SSCF). WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 129:35-46. [PMID: 34023801 DOI: 10.1016/j.wasman.2021.05.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 05/05/2021] [Accepted: 05/06/2021] [Indexed: 06/12/2023]
Abstract
Paper mill sludge (PMS) raises critical environmental issues due to its disposal problem, but its high sugar content and well-dispersed structure make it a great feedstock for biochemical production. The technical feasibility of integrating cellulase enzyme production into lactic acid (LA) fermentation from PMS was investigated in this study. The low ash content of PMS suggests a great potential for cellulase production. The enzyme produced using PMS without any treatment gave an activity of 7.8 FPU/ml, a performance comparable to the commercial enzyme, Cellic CTec 2. The LA yield from PMS with in-house enzyme was 64.7% and 73.7% at the enzyme loading of 10 and 15 FPU/g-glucan, respectively. The LA obtained was optically pure L- isomer with over 99% purity. The optimal condition of LA production by Bacillus coagulans was found to be 50 °C and pH 5.3 (with 50 g/L CaCO3). The nutrient effect of yeast extract (YE) and corn steep liquor (CSL) was substrate dependent, and CSL could substitute YE as an inexpensive nutrient when using PMS as a substrate.
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Affiliation(s)
- Jing Li
- Alabama Center for Paper and Bioresource Engineering, Department of Chemical Engineering, Auburn University, Auburn, AL 36849, United States
| | - Suan Shi
- Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, United States
| | - Yi Wang
- Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, United States
| | - Zhihua Jiang
- Alabama Center for Paper and Bioresource Engineering, Department of Chemical Engineering, Auburn University, Auburn, AL 36849, United States.
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7
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Wu J, Yan X, Weng P, Chen G, Wu Z. Homology- and cross-resistance of Lactobacillus plantarum to acid and osmotic stress and the influence of induction conditions on its proliferation by RNA-Seq. J Basic Microbiol 2021; 61:576-590. [PMID: 33945164 DOI: 10.1002/jobm.202100051] [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: 01/29/2021] [Revised: 03/23/2021] [Accepted: 04/18/2021] [Indexed: 12/27/2022]
Abstract
In this study, homology- and cross-resistance of Lactobacillus plantarum L1 and Lactobacillus plantarum L2 to acid and osmotic stress were investigated. Meanwhile, its proliferation mechanism was demonstrated by transcriptomic analysis using RNA sequencing. We found that the homologous-resistance and cross-resistance of L. plantarum L1 and L. plantarum L2 increased after acid and osmotic induction treatment by lactic acid and sodium lactate solution in advance, and the survival rate of live bacteria was improved. In addition, the count of viable bacteria of L. plantarum L2 significantly increased cultivated at a pH 5.0 with a 15% sodium lactate sublethal treatment, compared with the control group. Further study revealed that genes related to membrane transport, amino acid metabolism, nucleotide metabolism, and cell growth were significantly upregulated. These findings will contribute to promote high-density cell culture of starter cultures production in the fermented food industry.
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Affiliation(s)
- Jingyi Wu
- College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, Zhejiang, China
| | - Xu Yan
- College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, Zhejiang, China
| | - Peifang Weng
- College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, Zhejiang, China
| | - Gong Chen
- Sichuan Food Fermentation Industry Research and Design Institute, Chengdu, Sichuan, China
| | - Zufang Wu
- College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, Zhejiang, China
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8
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Rapid evaluation of optimal growth substrates and improvement of industrial production of Bifidobacterium adolescentis based on the automatic feedback feeding method. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.110960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Zhang H, Wang Q, Liu H, Kong B, Chen Q. In vitro growth performance, antioxidant activity and cell surface physiological characteristics of Pediococcus pentosaceus R1 and Lactobacillus fermentum R6 stressed at different NaCl concentrations. Food Funct 2021; 11:6376-6386. [PMID: 32613220 DOI: 10.1039/c9fo02309g] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
This study investigated the impact of NaCl concentrations on the growth performance, antioxidant activity, and cell surface physiological characteristics of Pediococcus pentosaceus R1 and Lactobacillus fermentum R6. The growth of the two strains was significantly inhibited by 4 and 6% NaCl and stagnated at 8% NaCl (P < 0.05). Compared with the control, both strains showed higher acid-producing activity, antioxidant activity and autoaggregation ability at 2 or 4% NaCl. A lower cell surface hydrophobicity of the two strains was observed with increased NaCl concentrations. High NaCl concentrations resulted in cell surface damage and deformation and even slowed the proliferation of the strains, and led to significant shifts in amide A and amide III groups in proteins and the C-H stretching of >CH2 in fatty acids (P < 0.05). In summary, appropriate NaCl concentrations (2 and 4%) improved the antioxidant activity of the two strains, while the higher NaCl concentrations (6%) decreased their antioxidant activity, which may be due to the associated changes in the cell surface structural properties of the two strains.
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Affiliation(s)
- Huan Zhang
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang 150030, China.
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10
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Tian X, Liu X, Zhang Y, Chen Y, Hang H, Chu J, Zhuang Y. Metabolic engineering coupled with adaptive evolution strategies for the efficient production of high-quality L-lactic acid by Lactobacillus paracasei. BIORESOURCE TECHNOLOGY 2021; 323:124549. [PMID: 33406469 DOI: 10.1016/j.biortech.2020.124549] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 12/10/2020] [Accepted: 12/11/2020] [Indexed: 05/26/2023]
Abstract
The main indicators for industrial production of high-quality lactic acid at elevated temperatures are high titer, productivity, yield, and optical purity. However, no such strains have been reported to meet all these requirements simultaneously. In this study, a high optical purity L-lactic acid producing strain is developed through the CRISPR-Cas9 gene editing platform. Further, adaptive evolution was used to breed and select a high-performance strain (NCBIO01-M2-ldhL1-HT) that could efficiently produce L-lactic acid at a high temperature of 45℃. This strain produced 221.0 g/L of L-lactic acid in open fermentation with high initial glucose concentration. Also, L-lactic acid productivity and yield was above 7.5 g/L/h and 0.96 g/g respectively, as well as the optical purity of L-lactic acid in the fermentation broth exceeded 99.1%. In short, this breeding strain possess high potential to be considered for the commercial production of polymer-grade L-lactic acid.
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Affiliation(s)
- Xiwei Tian
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xuehua Liu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yifan Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yang Chen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Haifeng Hang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China.
| | - Ju Chu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yingping Zhuang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
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11
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Behzadnia A, Moosavi-Nasab M, Ojha S, Tiwari BK. Exploitation of Ultrasound Technique for Enhancement of Microbial Metabolites Production. Molecules 2020; 25:E5473. [PMID: 33238482 PMCID: PMC7700470 DOI: 10.3390/molecules25225473] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 11/15/2020] [Accepted: 11/17/2020] [Indexed: 02/06/2023] Open
Abstract
Microbial metabolites have significant impacts on our lives from providing valuable compounds for nutrition to agriculture and healthcare. Ever-growing demand for these natural compounds has led to the need for smart and efficient production techniques. Ultrasound is a multi-applicable technology widely exploited in a range of industries such as chemical, medical, biotechnological, pharmaceutical, and food processes. Depending on the type of ultrasound employed, it can be used to either monitor or drive fermentation processes. Ultrasonication can improve bioproduct productivity via intensifying the performance of living organisms. Controlled ultrasonication can influence the metabolites' biosynthesis efficiency and growth rates by improvement of cell permeability as well as mass transfer and nutrient uptake rates through cell membranes. This review contains a summarized description about suitable microbial metabolites and the applications of ultrasound technique for enhancement of the production of these metabolites as well as the associated downstream processing.
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Affiliation(s)
- Asma Behzadnia
- Department of Food Science and Technology, School of Agriculture, Shiraz University, 7144165186 Shiraz, Iran
- Seafood Processing Research Group, School of Agriculture, Shiraz University, 7144165186 Shiraz, Iran
| | - Marzieh Moosavi-Nasab
- Department of Food Science and Technology, School of Agriculture, Shiraz University, 7144165186 Shiraz, Iran
- Seafood Processing Research Group, School of Agriculture, Shiraz University, 7144165186 Shiraz, Iran
| | - Shikha Ojha
- Department of Horticultural Engineering, Leibniz Institute for Agricultural Engineering and Bioeconomy, 14469 Potsdam, Germany;
- Food Chemistry and Technology, Teagasc Food Research Centre, 53.38066 Dublin, Ireland;
| | - Brijesh K. Tiwari
- Food Chemistry and Technology, Teagasc Food Research Centre, 53.38066 Dublin, Ireland;
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12
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Exploring cellular fatty acid composition and intracellular metabolites of osmotic-tolerant mutant Lactobacillus paracasei NCBIO-M2 for highly efficient lactic acid production with high initial glucose concentration. J Biotechnol 2018; 286:27-35. [DOI: 10.1016/j.jbiotec.2018.09.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 08/27/2018] [Accepted: 09/11/2018] [Indexed: 11/22/2022]
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13
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Zhu Z, Ji X, Wu Z, Zhang J, Du G. Improved acid-stress tolerance of Lactococcus lactis NZ9000 and Escherichia coli BL21 by overexpression of the anti-acid component recT. J Ind Microbiol Biotechnol 2018; 45:1091-1101. [PMID: 30232653 DOI: 10.1007/s10295-018-2075-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 08/22/2018] [Indexed: 12/01/2022]
Abstract
Acid accumulation caused by carbon metabolism severely affects the fermentation performance of microbial cells. Here, different sources of the recT gene involved in homologous recombination were functionally overexpressed in Lactococcus lactis NZ9000 and Escherichia coli BL21, and their acid-stress tolerances were investigated. Our results showed that L. lactis NZ9000 (ERecT and LRecT) strains showed 1.4- and 10.4-fold higher survival rates against lactic acid (pH 4.0), respectively, and that E. coli BL21 (ERecT) showed 16.7- and 9.4-fold higher survival rates than the control strain against lactic acid (pH 3.8) for 40 and 60 min, respectively. Additionally, we found that recT overexpression in L. lactis NZ9000 improved their growth under acid-stress conditions, as well as increased salt- and ethanol-stress tolerance and intracellular ATP concentrations in L. lactis NZ9000. These findings demonstrated the efficacy of recT overexpression for enhancing acid-stress tolerance and provided a promising strategy for insertion of anti-acid components in different hosts.
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Affiliation(s)
- Zhengming Zhu
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China.,School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
| | - Xiaomei Ji
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China.,School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
| | - Zhimeng Wu
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China. .,School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China.
| | - Juan Zhang
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China. .,School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China.
| | - Guocheng Du
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China.,School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, Jiangsu, China
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14
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Metabolite profiling coupled with metabolic flux analysis reveals physiological and metabolic impacts on Lactobacillus paracasei oxygen metabolism. Process Biochem 2018. [DOI: 10.1016/j.procbio.2017.11.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Han M, Xu JZ, Liu ZM, Qian H, Zhang WG. Co-production of microbial oil and exopolysaccharide by the oleaginous yeastSporidiobolus pararoseusgrown in fed-batch culture. RSC Adv 2018; 8:3348-3356. [PMID: 35541180 PMCID: PMC9077544 DOI: 10.1039/c7ra12813d] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 01/03/2018] [Indexed: 11/21/2022] Open
Abstract
The production cost of microbial oil was reduced by improving the exopolysaccharide (EPS) production to share the production cost using Sporidiobolus pararoseus JD-2. Batch fermentation demonstrated that S. pararoseus JD-2 has the potential to co-produce oil and EPS with 120 g L−1 glucose, 20 g L−1 corn steep liquor and 10 g L−1 yeast extract as carbon and nitrogen sources. Using fed-batch fermentation for 72 h resulted in oil and EPS production of 41.6 ± 2.5 g L−1 and 13.1 ± 0.6 g L−1 with the productivity of 0.58 g L−1 h−1 and 0.182 g L−1 h−1, respectively. The fat soluble nutrients in the oil were studied, indicating that it was constituted of 79.19% unsaturated fatty acids and contained 505 mg per kg-oil of carotenoids. Moreover, the EPS contained only one type of polysaccharide; the main monosaccharide compositions were galactose, glucose and mannose in a proportion of 16 : 8 : 1. These results implied that EPS produced by S. pararoseus JD-2 was a new type of EPS. The production cost of microbial oil was reduced by improving the exopolysaccharide (EPS) production to share the production cost using Sporidiobolus pararoseus JD-2.![]()
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Affiliation(s)
- Mei Han
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology
- Ministry of Education
- School of Biotechnology
- Jiangnan University
- WuXi 214122
| | - Jian-Zhong Xu
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology
- Ministry of Education
- School of Biotechnology
- Jiangnan University
- WuXi 214122
| | - Zhen-Min Liu
- State Key Laboratory of Dairy Biotechnology
- Technology Center Bright Dairy & Food Co., Ltd
- Shanghai 200436
- China
| | - He Qian
- School of Food Science and Technology
- Jiangnan University
- Wuxi-214122
- China
| | - Wei-Guo Zhang
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology
- Ministry of Education
- School of Biotechnology
- Jiangnan University
- WuXi 214122
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16
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Kwan TH, Vlysidis A, Wu Z, Hu Y, Koutinas A, Lin CSK. Lactic acid fermentation modelling of Streptococcus thermophilus YI-B1 and Lactobacillus casei Shirota using food waste derived media. Biochem Eng J 2017. [DOI: 10.1016/j.bej.2017.08.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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17
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Chiou TY, Suda W, Oshima K, Hattori M, Takahashi T. Changes in the bacterial community in the fermentation process of kôso, a Japanese sugar-vegetable fermented beverage. Biosci Biotechnol Biochem 2017; 81:403-410. [DOI: 10.1080/09168451.2016.1249449] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Kôso is a Japanese fermented beverage made with over 20 kinds of vegetables, mushrooms, and sugars. The changes in the bacterial population of kôso during fermentation at 25 °C over a period of 10 days were studied using 454 pyrosequencing of the 16S rRNA gene. The analysis detected 224 operational taxonomic units (OTUs) clustered from 8 DNA samples collected on days 0, 3, 7, and 10 from two fermentation batches. Proteobacteria were the dominant phylum in the starting community, but were replaced by Firmicutes within three days. Seventy-eight genera were identified from the 224 OTUs, in which Bifidobacterium, Leuconostoc, Lactococcus, and Lactobacillus dominated, accounting for over 96% of the total bacterial population after three days’ fermentation. UniFrac–Principal Coordinate Analysis of longitudinal fermented samples revealed dramatic changes in the bacterial community in kôso, resulting in significantly low diversity at the end of fermentation as compared with the complex starting community.
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Affiliation(s)
- Tai-Ying Chiou
- Laboratory of Food Science and Technology, Department of Biotechnology and Environmental Chemistry, Kitami Institute of Technology, Kitami, Japan
| | - Wataru Suda
- Department of Computational Biology, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
- Department of Microbiology and Immunology, Keio University School of Medicine, Tokyo, Japan
| | - Kenshiro Oshima
- Department of Computational Biology, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
| | - Masahira Hattori
- Department of Computational Biology, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
- Cooperative Major in Advanced Health Science, Graduate School of Advanced Science and Engineering, Tokyo, Japan
| | - Tomoya Takahashi
- ARSOA Research & Development Center, AOB Keioh Group Corporation, Hokuto, Japan
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Enhanced Glucose Consumption and Organic Acid Production by Engineered Corynebacterium glutamicum Based on Analysis of a pfkB1 Deletion Mutant. Appl Environ Microbiol 2017; 83:AEM.02638-16. [PMID: 27881414 DOI: 10.1128/aem.02638-16] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 11/17/2016] [Indexed: 02/08/2023] Open
Abstract
In the analysis of a carbohydrate metabolite pathway, we found interesting phenotypes in a mutant strain of Corynebacterium glutamicum deficient in pfkB1, which encodes fructose-1-phosphate kinase. After being aerobically cultivated with fructose as a carbon source, this mutant consumed glucose and produced organic acid, predominantly l-lactate, at a level more than 2-fold higher than that of the wild-type grown with glucose under conditions of oxygen deprivation. This considerably higher fermentation capacity was unique for the combination of pfkB1 deletion and cultivation with fructose. In the metabolome and transcriptome analyses of this strain, marked intracellular accumulation of fructose-1-phosphate and significant upregulation of several genes related to the phosphoenolpyruvate:carbohydrate phosphotransferase system, glycolysis, and organic acid synthesis were identified. We then examined strains overexpressing several of the identified genes and demonstrated enhanced glucose consumption and organic acid production by these engineered strains, whose values were found to be comparable to those of the model pfkB1 deletion mutant grown with fructose. l-Lactate production by the ppc deletion mutant of the engineered strain was 2,390 mM (i.e., 215 g/liter) after 48 h under oxygen deprivation, which was a 2.7-fold increase over that of the wild-type strain with a deletion of ppc IMPORTANCE: Enhancement of glycolytic flux is important for improving microbiological production of chemicals, but overexpression of glycolytic enzymes has often resulted in little positive effect. That is presumably because the central carbon metabolism is under the complex and strict regulation not only transcriptionally but also posttranscriptionally, for example, by the ATP/ADP ratio. In contrast, we studied a mutant strain of Corynebacterium glutamicum that showed markedly enhanced glucose consumption and organic acid production and, based on the findings, identified several genes whose overexpression was effective in enhancing glycolytic flux under conditions of oxygen deprivation. These results will further understanding of the regulatory mechanisms of glycolytic flux and can be widely applied to the improvement of the microbial production of useful chemicals.
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Guo Y, Dong Y, Hong X, Pang X, Chen D, Chen X. Directed Evolution of Dunaliella salina Ds-26-16 and Salt-Tolerant Response in Escherichia coli. Int J Mol Sci 2016; 17:ijms17111813. [PMID: 27801872 PMCID: PMC5133814 DOI: 10.3390/ijms17111813] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 10/17/2016] [Accepted: 10/25/2016] [Indexed: 12/02/2022] Open
Abstract
Identification and evolution of salt tolerant genes are crucial steps in developing salt tolerant crops or microorganisms using biotechnology. Ds-26-16, a salt tolerant gene that was isolated from Dunaliella salina, encodes a transcription factor that can confer salt tolerance to a number of organisms including Escherichia coli (E. coli), Haematococcus pluvialis and tobacco. To further improve its salt tolerance, a random mutagenesis library was constructed using deoxyinosine triphosphate-mediated error-prone PCR technology, and then screened using an E. coli expression system that is based on its broad-spectrum salt tolerance. Seven variants with enhanced salt tolerance were obtained. Variant EP-5 that contained mutation S32P showed the most improvement with the E. coli transformant enduring salt concentrations up to 1.54 M, in comparison with 1.03 M for the wild type gene. Besides, Ds-26-16 and EP-5 also conferred E. coli transformant tolerance to freezing, cold, heat, Cu2+ and alkaline. Homology modeling revealed that mutation S32P in EP-5 caused the conformational change of N- and C-terminal α-helixes. Expression of Ds-26-16 and EP-5 maintained normal cellular morphology, increased the intracellular antioxidant enzymatic activity, reduced malondialdehyde content, and stimulated Nitric Oxide synthesis, thus enhancing salt tolerance to E. coli transformants.
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Affiliation(s)
- Yuan Guo
- Department of Biochemistry and Molecular Biology, College of Life Sciences, Nankai University, No. 94 Weijin Rd., Tianjin 300071, China.
| | - Yanping Dong
- Department of Biochemistry and Molecular Biology, College of Life Sciences, Nankai University, No. 94 Weijin Rd., Tianjin 300071, China.
| | - Xiao Hong
- Department of Genetics and Cell Biology, College of Life Sciences, Nankai University, No. 94 Weijin Rd., Tianjin 300071, China.
| | - Xiaonan Pang
- Department of Genetics and Cell Biology, College of Life Sciences, Nankai University, No. 94 Weijin Rd., Tianjin 300071, China.
| | - Defu Chen
- Department of Genetics and Cell Biology, College of Life Sciences, Nankai University, No. 94 Weijin Rd., Tianjin 300071, China.
| | - Xiwen Chen
- Department of Biochemistry and Molecular Biology, College of Life Sciences, Nankai University, No. 94 Weijin Rd., Tianjin 300071, China.
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Abdel-Rahman MA, Sonomoto K. Opportunities to overcome the current limitations and challenges for efficient microbial production of optically pure lactic acid. J Biotechnol 2016; 236:176-92. [DOI: 10.1016/j.jbiotec.2016.08.008] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 08/11/2016] [Indexed: 10/21/2022]
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21
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Maximum-biomass prediction of homofermentative Lactobacillus. J Biosci Bioeng 2016; 122:52-7. [DOI: 10.1016/j.jbiosc.2015.12.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 11/06/2015] [Accepted: 12/05/2015] [Indexed: 01/09/2023]
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22
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Effects of nitrogen on the lipid and carotenoid accumulation of oleaginous yeast Sporidiobolus pararoseus. Bioprocess Biosyst Eng 2016; 39:1425-33. [DOI: 10.1007/s00449-016-1620-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Accepted: 04/27/2016] [Indexed: 11/26/2022]
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23
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Hosseini Nezhad M, Hussain MA, Britz ML. Stress responses in probiotic Lactobacillus casei. Crit Rev Food Sci Nutr 2016; 55:740-9. [PMID: 24915363 DOI: 10.1080/10408398.2012.675601] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Survival in harsh environments is critical to both the industrial performance of lactic acid bacteria (LAB) and their competitiveness in complex microbial ecologies. Among the LAB, members of the Lactobacillus casei group have industrial applications as acid-producing starter cultures for milk fermentations and as specialty cultures for the intensification and acceleration of flavor development in certain bacterial-ripened cheese varieties. They are amongst the most common organisms in the gastrointestinal (GI) tract of humans and other animals, and have the potential to function as probiotics. Whether used in industrial or probiotic applications, environmental stresses will affect the physiological status and properties of cells, including altering their functionality and biochemistry. Understanding the mechanisms of how LAB cope with different environments is of great biotechnological importance, from both a fundamental and applied perspective: hence, interaction between these strains and their environment has gained increased interest in recent years. This paper presents an overview of the important features of stress responses in Lb. casei, and related proteomic or gene expression patterns that may improve their use as starter cultures and probiotics.
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Murakami N, Oba M, Iwamoto M, Tashiro Y, Noguchi T, Bonkohara K, Abdel-Rahman MA, Zendo T, Shimoda M, Sakai K, Sonomoto K. l-Lactic acid production from glycerol coupled with acetic acid metabolism by Enterococcus faecalis without carbon loss. J Biosci Bioeng 2016; 121:89-95. [DOI: 10.1016/j.jbiosc.2015.05.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 04/27/2015] [Accepted: 05/17/2015] [Indexed: 11/27/2022]
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25
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Cui SM, Zhao JX, Liu XM, Chen YQ, Zhang H, Chen W. Maximum-biomass concentration prediction for Bifidobacteria in the pH-controlled fed-batch culture. Lett Appl Microbiol 2015; 62:256-63. [PMID: 26678246 DOI: 10.1111/lam.12540] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 11/05/2015] [Accepted: 11/16/2015] [Indexed: 11/28/2022]
Abstract
UNLABELLED Our objective was to systematically study the relationship between maximum biomass concentration of different Bifidobacteria and total-acid anions accumulation, and develop a prediction equation for the maximum biomass concentration in the fed-batch culture at pH-controlled 7·0. The accumulation of acid anions and the consumption of nutrients of various strains were evaluated. In addition, minimum inhibitory concentrations (MICs) of acid anions on a range of strains were examined at pH 7·0. The inhibition of acid anions, which had the same MIC as sodium chloride, was due to the osmotic pressure under pH 7·0 conditions. Moreover, the concentration of total-acid anions completely inhibiting each strain in the fed-batch culture at pH-controlled 7·0 had no significant differences with the MIC of acid anions for the corresponding strains. The osmotic pressures under two conditions were not significantly different. Finally, the maximum biomass concentration of Bifidobacteria was found to be closely related to biomass yield per unit of acid anion produced (YX/P ) and MIC (C) which were needed for the prediction, and different strains exhibited marked correlation (P ˂ 0·01, R = 0·985). An equation for the prediction of the maximum biomass concentration was developed as follows: Xmax -X0 = (0·71 ± 0·03)·YX/P ·C. SIGNIFICANCE AND IMPACT OF THE STUDY This study provides further insights into the inhibition of Bifidobacteria by dissociated acid anions (the dissociated form) at pH 7·0. The high correlation between different strains suggested that the equation established in this paper is appropriate for different strains of Bifidobacteria. The prediction equation could be used to guide practical production in the preparation of materials, the control of the end of fermentation and production plans for further products such as freeze-dried powder of Bifidobacteria or food fermentation.
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Affiliation(s)
- S M Cui
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - J X Zhao
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - X M Liu
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Y Q Chen
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - H Zhang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - W Chen
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China.,Beijing Innovation Centre of Food Nutrition and Human Health, Beijing Technology & Business University, Beijing, China
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26
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Abosereh NA, Ghani SAE, Gomaa RS, Fouad MT. Molecular Identification of Potential Probiotic Lactic Acid Bacteria Strains Isolated from Egyptian Traditional Fermented Dairy Products. ACTA ACUST UNITED AC 2015. [DOI: 10.3923/biotech.2016.35.43] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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27
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Tian X, Wang Y, Chu J, Zhuang Y, Zhang S. Enhanced l-lactic acid production in Lactobacillus paracasei by exogenous proline addition based on comparative metabolite profiling analysis. Appl Microbiol Biotechnol 2015; 100:2301-10. [DOI: 10.1007/s00253-015-7136-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 10/27/2015] [Accepted: 10/30/2015] [Indexed: 11/30/2022]
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28
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Sun W, Liu J, Xu H, Li W, Zhang J. l-Lactic acid fermentation by Enterococcus faecium: a new isolate from bovine rumen. Biotechnol Lett 2015; 37:1379-83. [DOI: 10.1007/s10529-015-1821-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 03/19/2015] [Indexed: 11/29/2022]
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29
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Washington LGDAJ, Iris DSF, Jane VDS, Aynoanne LB, Mateus MDC, Daniel RM, Francesca SD. Principal criteria for selection of lactic acid bacteria for potential use as probiotics in foods. ACTA ACUST UNITED AC 2015. [DOI: 10.5897/ajmr2014.7226] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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30
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Tolerance of Lactobacillus casei, Lactobacillus paracasei and Lactobacillus rhamnosus strains to stress factors encountered in food processing and in the gastro-intestinal tract. Lebensm Wiss Technol 2015. [DOI: 10.1016/j.lwt.2014.10.022] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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31
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Eiteman MA, Ramalingam S. Microbial production of lactic acid. Biotechnol Lett 2015; 37:955-72. [PMID: 25604523 DOI: 10.1007/s10529-015-1769-5] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 01/07/2015] [Indexed: 10/24/2022]
Abstract
Lactic acid is an important commodity chemical having a wide range of applications. Microbial production effectively competes with chemical synthesis methods because biochemical synthesis permits the generation of either one of the two enantiomers with high optical purity at high yield and titer, a result which is particularly beneficial for the production of poly(lactic acid) polymers having specific properties. The commercial viability of microbial lactic acid production relies on utilization of inexpensive carbon substrates derived from agricultural or waste resources. Therefore, optimal lactic acid formation requires an understanding and engineering of both the competing pathways involved in carbohydrate metabolism, as well as pathways leading to potential by-products which both affect product yield. Recent research leverages those biochemical pathways, while researchers also continue to seek strains with improved tolerance and ability to perform under desirable industrial conditions, for example, of pH and temperature.
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Affiliation(s)
- Mark A Eiteman
- BioChemical Engineering Program, College of Engineering, University of Georgia, Athens, GA, 30602, USA,
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32
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Metabolic engineering as a tool for enhanced lactic acid production. Trends Biotechnol 2014; 32:637-44. [DOI: 10.1016/j.tibtech.2014.10.005] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 10/02/2014] [Accepted: 10/08/2014] [Indexed: 11/19/2022]
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33
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Xu K, Xu P. Betaine and beet molasses enhance L-lactic acid production by Bacillus coagulans. PLoS One 2014; 9:e100731. [PMID: 24956474 PMCID: PMC4067348 DOI: 10.1371/journal.pone.0100731] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Accepted: 05/29/2014] [Indexed: 11/17/2022] Open
Abstract
Lactic acid is an important chemical with various industrial applications, and it can be efficiently produced by fermentation, in which Bacillus coagulans strains present excellent performance. Betaine can promote lactic acid fermentation as an effective osmoprotectant. Here, positive effect of betaine on fermentation by B. coagulans is revealed. Betaine could enhance lactic acid production by protecting l-LDH activity and cell growth from osmotic inhibition, especially under high glucose concentrations and with poor organic nitrogen nutrients. The fermentation with 0.05 g/L betaine could produce 17.9% more lactic acid compared to the fermentation without betaine. Beet molasses, which is rich in sucrose and betaine, was utilized in a co-feeding fermentation and raised the productivity by 22%. The efficient lactic acid fermentation by B. coagulans is thus developed by using betaine and beet molasses.
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Affiliation(s)
- Ke Xu
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Ping Xu
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, People's Republic of China
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34
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Enhanced L-lactic acid production from biomass-derived xylose by a mutant Bacillus coagulans. Appl Biochem Biotechnol 2014; 173:1896-906. [PMID: 24879598 DOI: 10.1007/s12010-014-0975-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2014] [Accepted: 05/16/2014] [Indexed: 10/25/2022]
Abstract
Xylose effective utilization is crucial for production of bulk chemicals from low-cost lignocellulosic substrates. In this study, an efficient L-lactate production process from xylose by a mutant Bacillus coagulans NL-CC-17 was demonstrated. The nutritional requirements for L-lactate production by B. coagulans NL-CC-17 were optimized statistically in shake flask fermentations. Corn steep liquor powder and yeast exact were identified as the most significant factors by the two-level Plackett-Burman design. Steepest ascent experiments were applied to approach the optimal region of the two factors, and a central composite design was employed to determine their optimal levels. The optimal medium was used to perform batch fermentation in a 3-l bioreactor. A maximum of 90.29 g l(-1) L-lactic acid was obtained from 100 g l(-1) xylose in 120 h. When using corn stove prehydrolysates as substrates, 23.49 g l(-1) L-lactic acid was obtained in 36 h and the yield was 83.09 %.
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35
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L-Lactic acid production benefits from reduction of environmental osmotic stress through neutralizing agent combination. Bioprocess Biosyst Eng 2014; 37:1917-23. [PMID: 24633312 DOI: 10.1007/s00449-014-1166-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Accepted: 02/26/2014] [Indexed: 10/25/2022]
Abstract
This paper hinged on the combination effect of two different neutralizing agents Ca(OH)2 and NH4OH on the production of L-lactic acid by Lactobacillus paracasei. Present study quantitatively indicated that environmental osmotic pressure (844-1,772 mOsm/kg) exerted minor influence on L-lactic acid production, but a critical level fell on approximately 3,000 mOsm/kg which restricted L-lactic acid production significantly. Once osmotic pressure exceeded 3,600 mOsm/kg, L-lactic acid production ran aground. A new and efficient neutralizing agent-adding strategy was established in this study to procure 2.21-fold enhancement (5.94 g/l/h) relative to previous productivity of L-lactic acid with NH4OH as neutralizing agent via batch cultivation. It was, therefore, speculated that inhibition effect in the late phase of the fermentation might be in large part attributed to the dramatic increase of environmental osmotic stress, other than cumulative effect of lactate concentration itself.
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36
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Kinetic characterization of recombinant Bacillus coagulans FDP-activated l-lactate dehydrogenase expressed in Escherichia coli and its substrate specificity. Protein Expr Purif 2014; 95:219-25. [DOI: 10.1016/j.pep.2013.12.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Revised: 12/13/2013] [Accepted: 12/14/2013] [Indexed: 01/26/2023]
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Zou H, Wu Z, Xian M, Liu H, Cheng T, Cao Y. Not only osmoprotectant: betaine increased lactate dehydrogenase activity and L-lactate production in lactobacilli. BIORESOURCE TECHNOLOGY 2013; 148:591-595. [PMID: 24035452 DOI: 10.1016/j.biortech.2013.08.105] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Revised: 08/16/2013] [Accepted: 08/19/2013] [Indexed: 06/02/2023]
Abstract
Lactobacilli are commonly used for industrial production of polymer-grade L-lactic acid. The present study tested the Tween 80 alternative betaine in L-lactate production by several industrial lactobacilli. In flask fermentation of Lactobacillus casei, Lactobacillus buchneri, Lactobacillus lactis and Lactobacillus rhamnosus, the betaine addition (2g/l) had similar osmoprotectant effect with Tween 80 but had increased the lactate dehydrogenase activities and L-lactate production than Tween 80 control. In fed-batch fermentation of L. casei, betaine supplementation improved the L-lactic acid titer to 190 g/l, the yield to 95.5% (g L-lactic acid/g glucose), the productivity to 2.6g/lh, and the optical purity to 97.0%. The results demonstrated that supplementation of Tween 80 alternative - betaine in the fermentation medium is feasible for industrial l-lactic acid fermentation by lactobacilli, which will improve the lactate production but will not increase the process costs and modify any process conditions.
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Affiliation(s)
- Huibin Zou
- CAS Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
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Choi M, Al-Zahrani SM, Lee SY. Kinetic model-based feed-forward controlled fed-batch fermentation of Lactobacillus rhamnosus for the production of lactic acid from Arabic date juice. Bioprocess Biosyst Eng 2013; 37:1007-15. [DOI: 10.1007/s00449-013-1071-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 09/22/2013] [Indexed: 10/26/2022]
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39
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Ye L, Zhou X, Hudari MSB, Li Z, Wu JC. Highly efficient production of L-lactic acid from xylose by newly isolated Bacillus coagulans C106. BIORESOURCE TECHNOLOGY 2013; 132:38-44. [PMID: 23399496 DOI: 10.1016/j.biortech.2013.01.011] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Revised: 12/30/2012] [Accepted: 01/04/2013] [Indexed: 06/01/2023]
Abstract
Cost-effective production of optically pure lactic acid from lignocellulose sugars is commercially attractive but challenging. Bacillus coagulans C106 was isolated from environment and used to produce l-lactic acid from xylose at 50°C and pH 6.0 in mineral salts medium containing 1-2% (w/v) of yeast extract without sterilizing the medium before fermentation. In batch fermentation with 85g/L of xylose, lactic acid titer and productivity reached 83.6g/L and 7.5g/Lh, respectively. When fed-batch (120+80+60g/L) fermentation was applied, they reached 215.7g/L and 4.0g/Lh, respectively. In both cases, the lactic acid yield and optical purity reached 95% and 99.6%, respectively. The lactic acid titer and productivity on xylose are the highest among those ever reported. Ca(OH)2 was found to be a better neutralizing agent than NaOH in terms of its giving higher lactic acid titer (1.2-fold) and productivity (1.8-fold) under the same conditions.
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Affiliation(s)
- Lidan Ye
- Institute of Chemical and Engineering Sciences, Agency for Sciences, Technology and Research, 1 Pesek Road, Jurong Island, Singapore 627833, Singapore
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40
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Zhou X, Ye L, Wu JC. Efficient production of L-lactic acid by newly isolated thermophilic Bacillus coagulans WCP10-4 with high glucose tolerance. Appl Microbiol Biotechnol 2013; 97:4309-14. [PMID: 23354450 DOI: 10.1007/s00253-013-4710-7] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 01/03/2013] [Accepted: 01/08/2013] [Indexed: 12/01/2022]
Abstract
A thermophilic Bacillus coagulans WCP10-4 with tolerance to high concentration of glucose was isolated from soil and used to produce optically pure L-lactic acid from glucose and starch. In batch fermentation at pH 6.0, 240 g/L of glucose was completely consumed giving 210 g/L of L-lactic acid with a yield of 95 % and a productivity of 3.5 g/L/h. In simultaneous saccharification and fermentation at 50 °C without sterilizing the medium, 200 g/L of corn starch was completely consumed producing 202.0 g/L of L-lactic acid. To the best of our knowledge, this strain shows the highest osmotic tolerance to glucose among the strains ever reported for lactic acid production. This is the first report of simultaneous saccharification and fermentation of starch for lactic acid production under a non-sterilized condition.
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Affiliation(s)
- Xingding Zhou
- Industrial Biotechnology Programme, Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island 627833, Singapore
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Zhang H, Chong H, Ching CB, Jiang R. Random mutagenesis of global transcription factor cAMP receptor protein for improved osmotolerance. Biotechnol Bioeng 2011; 109:1165-72. [DOI: 10.1002/bit.24411] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Revised: 11/07/2011] [Accepted: 12/08/2011] [Indexed: 11/08/2022]
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