1
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Zou Y, Zhou C, Chang X, Zhao F, Ye K. Differential mechanism between Listeria monocytogenes strains with different virulence contaminating ready-to-eat sausages during the simulated gastrointestinal tract. Food Res Int 2024; 186:114312. [PMID: 38729688 DOI: 10.1016/j.foodres.2024.114312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 03/26/2024] [Accepted: 04/16/2024] [Indexed: 05/12/2024]
Abstract
Listeria monocytogenes exhibits varying levels of pathogenicity when entering the host through contaminated food. However, little is known regarding the stress response and environmental tolerance mechanism of different virulence strains to host gastrointestinal (GI) stimuli. This study analyzed the differences in the survival and genes of stress responses among two strains of L. monocytogenes 10403S (serotype 1/2a, highly virulent strain) and M7 (serotype 4a, low-virulence strain) during simulated gastrointestinal digestion. The results indicated that L. monocytogenes 10403S showed greater acid and bile salt tolerance than L. monocytogenes M7, with higher survival rates and less cell deformation and cell membrane permeability during the in vitro digestion. KEGG analysis of the transcriptomes indicated that L. monocytogenes 10403S displayed significant activity in amino acid metabolism, such as glutamate and arginine, associated with acid tolerance. Additionally, L. monocytogenes 10403S demonstrated a higher efficacy in promoting activities that preserve bacterial cell membrane integrity and facilitate flagellar protein synthesis. These findings will contribute valuable practical insights into the tolerance distinctions among different virulence strains of L. monocytogenes in the GI environment.
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Affiliation(s)
- Yafang Zou
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, 210095 Nanjing, Jiangsu, PR China
| | - Cong Zhou
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, 210095 Nanjing, Jiangsu, PR China
| | - Xiaochen Chang
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, 210095 Nanjing, Jiangsu, PR China
| | - Fanwen Zhao
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, 210095 Nanjing, Jiangsu, PR China
| | - Keping Ye
- State Key Laboratory of Meat Quality Control and Cultured Meat Development, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, 210095 Nanjing, Jiangsu, PR China.
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2
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Yang J, Zhang S, Zhang Y, Zhao D, Liu T, Sun X, Yan L. Phenomic and transcriptomic analyses reveal the sequential synthesis of Fe 3O 4 nanoparticles in Acidithiobacillus ferrooxidans BYM. Microbiol Spectr 2023; 11:e0172923. [PMID: 37800960 PMCID: PMC10714799 DOI: 10.1128/spectrum.01729-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 08/17/2023] [Indexed: 10/07/2023] Open
Abstract
IMPORTANCE As the most important non-magnetotactic magnetosome-producing bacteria, Acidithiobacillus ferrooxidans only requires very mild conditions to produce Fe3O4 nanoparticles, thus conferring greater flexibility and potential application in biomagnetic nanoparticle production. However, the available information cannot explain the mechanism of Fe3O4 nanoparticle formation in A. ferrooxidans. In this study, we applied phenomic and transcriptomic analyses to reveal this mechanism. We found that different treatment condition factors notably affect the phenomic data of Fe3O4 nanoparticle in A. ferrooxidans. Using transcriptomic analyses, the gene network controlling/regulating Fe3O4 nanoparticle biogenesis in A. ferrooxidans was proposed, excavating the candidate hub genes for Fe3O4 nanoparticle formation in A. ferrooxidans. Based on this information, a sequential model for Fe3O4 nanoparticle synthesis in A. ferrooxidans was hypothesized. It lays the groundwork for further clarifying the feature of Fe3O4 nanoparticle synthesis.
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Affiliation(s)
- Jiani Yang
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
| | - Shuang Zhang
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
| | - Yu Zhang
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
| | - Dan Zhao
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
| | - Tao Liu
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
- Key Laboratory of Low-Carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs, Daqing, Heilongjiang, China
| | - Xindi Sun
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
| | - Lei Yan
- Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in Cold Region, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China
- Key Laboratory of Low-Carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs, Daqing, Heilongjiang, China
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3
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Basak S. The potential of pulsed magnetic field to achieve microbial inactivation and enzymatic stability in foods: A concise critical review. FUTURE FOODS 2023. [DOI: 10.1016/j.fufo.2023.100230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023] Open
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4
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Chen H, Ji PC, Qi YH, Chen SJ, Wang CY, Yang YJ, Zhao XY, Zhou JW. Inactivation of Pseudomonas aeruginosa biofilms by thymoquinone in combination with nisin. Front Microbiol 2023; 13:1029412. [PMID: 36741886 PMCID: PMC9893119 DOI: 10.3389/fmicb.2022.1029412] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Accepted: 12/14/2022] [Indexed: 01/20/2023] Open
Abstract
Pseudomonas aeruginosa is one of the most important foodborne pathogens that can persist in leafy green vegetables and subsequently produce biofilms. In this study, the synergistic effect of thymoquinone and nisin in reducing biofilm formation of P. aeruginosa on lettuce was evaluated, and their anti-virulence and anti-biofilm mechanisms were also investigated. At concentrations ranging from 0.5 to 2 mg/ml, thymoquinone inhibited the production of autoinducers and virulence factors, and enhanced the susceptibility of P. aeruginosa biofilms to nisin as evidenced by the scanning electron microscopy and confocal laser scanning microscopy. Integrated transcriptomics, metabolomics, and docking analyses indicated that thymoquinone treatment disrupted the quorum sensing (QS) system, altered cell membrane component, and down-regulated the expressions of genes related to virulence, efflux pump, and antioxidation. The changed membrane component and repressed efflux pump system enhanced membrane permeability and facilitated the entrance of nisin into cells, thus improving the susceptibility of biofilms to nisin. The dysfunctional QS and repressed antioxidant enzymes lead to the enhancement of oxidative stress. The enhanced oxidative stress disrupted energy metabolism and protein metabolism and ultimately attenuated the virulence and pathogenicity of P. aeruginosa PAO1. Our study indicated that thymoquinone has the potential to function as a QS-based agent to defend against foodborne pathogens in combination with nisin.
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Affiliation(s)
- Hong Chen
- Luoyang Key Laboratory of Organic Functional Molecules, College of Food and Drug, Luoyang Normal University, Luoyang, China
| | - Peng-Cheng Ji
- School of Food and Biological Engineering, Xuzhou University of Technology, Xuzhou, China
| | - Yue-Heng Qi
- Luoyang Key Laboratory of Organic Functional Molecules, College of Food and Drug, Luoyang Normal University, Luoyang, China
| | - Shi-Jin Chen
- Luoyang Key Laboratory of Organic Functional Molecules, College of Food and Drug, Luoyang Normal University, Luoyang, China
| | - Chang-Yao Wang
- School of Food and Biological Engineering, Xuzhou University of Technology, Xuzhou, China
| | - Yu-Jie Yang
- School of Food and Biological Engineering, Xuzhou University of Technology, Xuzhou, China
| | - Xin-Yu Zhao
- School of Food and Biological Engineering, Xuzhou University of Technology, Xuzhou, China
| | - Jin-Wei Zhou
- School of Food and Biological Engineering, Xuzhou University of Technology, Xuzhou, China,*Correspondence: Jin-Wei Zhou, ✉
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5
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Zhang Y, Wang F, Wu H, Fan L, Wang Y, Liu X, Zhang H. Sterilising effect of high power pulse microwave on Listeria monocytogenes. INTERNATIONAL FOOD RESEARCH JOURNAL 2022. [DOI: 10.47836/ifrj.29.5.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In the present work, Listeria monocytogenes was used as the target strain to investigate the sterilising potential and mechanism of high power pulse microwave (HPPM). Results showed that the inactivation was positively correlated with the pulse frequencies and operating times. The count of Listeria monocytogenes was decreased by 5.09 log CFU/mL under 200 Hz for 9 min, which was used as the optimised condition to further explore the sterilisation mechanism. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that the L. monocytogenes cells of untreated group presented intact surfaces, clear boundary, and its intracellular contents distributed uniformly in the cytoplasm. Following treatment, the cell wall surfaces began to deform in small areas, and cell membranes were severely ruptured, thus resulting in the appearance of electron transmission areas. Extracellular protein and nucleic acid contents, represented by OD260 nm and OD280 nm, increased with the increase in operating time significantly. After treatment, SDS-PAGE profiles of whole-cell proteins displayed that the protein bands became lighter or even disappeared. Na+ K+-ATPase activities and intracellular ATP content decreased by 72.97 and 79.09%, respectively. This was consistent with the cell viability of L. monocytogenes observed by confocal laser scanning microscopy. Overall, the sterilisation mechanism of HPPM on L. monocytogenes may be caused by membrane damage, intracellular component leakage, and energy metabolism hindrance.
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6
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Liu X, Pang X, Wu Y, Wu Y, Shi Y, Zhang X, Chen Q. Synergistic Antibacterial Mechanism of Mannosylerythritol Lipid-A and Lactic Acid on Listeria monocytogenes Based on Transcriptomic Analysis. Foods 2022; 11:foods11172660. [PMID: 36076848 PMCID: PMC9455235 DOI: 10.3390/foods11172660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/26/2022] [Accepted: 08/28/2022] [Indexed: 11/21/2022] Open
Abstract
Mannosylerythritol lipids-A (MEL-A) is a novel biosurfactant with multiple biological effects. The synergistic antibacterial activity and mechanism of MEL-A and lactic acid (LA) against Listeria monocytogenes were investigated. The synergistic effect resulted in a significant increase in the antibacterial rate compared to LA treatment alone. Genome-wide transcriptomic analysis was applied to deeply investigate the synergistic antibacterial mechanism. Gene Ontology (GO) enrichment analysis showed that the synergy between MEL-A and LA affected many potential cellular responses, including the sugar phosphotransferase system, carbohydrate transport, and ribosomes. KEGG enrichment analysis showed that the PTS system and ribosome-related pathways were significantly enriched. In addition, synergistic treatment affected locomotion and membrane-related cellular responses in GO enrichment analysis and carbohydrate metabolism and amino acid metabolism pathways in KEGG enrichment analysis compared to LA treatment alone. The accuracy of the transcriptome analysis results was verified by qPCR (R2 = 0.9903). This study will provide new insights for the prevention and control of L. monocytogenes.
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Affiliation(s)
- Xiayu Liu
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd. 866, Hangzhou 310058, China
| | - Xinxin Pang
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd. 866, Hangzhou 310058, China
| | - Yansha Wu
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd. 866, Hangzhou 310058, China
| | - Yajing Wu
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd. 866, Hangzhou 310058, China
| | - Ying Shi
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd. 866, Hangzhou 310058, China
| | - Xinglin Zhang
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd. 866, Hangzhou 310058, China
- College of Agriculture and Forestry, Linyi University, Linyi 276005, China
| | - Qihe Chen
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd. 866, Hangzhou 310058, China
- Correspondence: ; Tel.: +86-571-86984316
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7
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Wang H, Shen J, Ma K, Zhu C, Fang M, Hou X, Zhang S, Wang W, Xue T. Transcriptome analysis revealed the role of capsular polysaccharides in desiccation tolerance of foodborne Staphylococcus aureus. Food Res Int 2022; 159:111602. [DOI: 10.1016/j.foodres.2022.111602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 06/24/2022] [Accepted: 06/28/2022] [Indexed: 11/04/2022]
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8
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Guo L, Azam SR, Guo Y, Liu D, Ma H. Germicidal efficacy of the pulsed magnetic field against pathogens and spoilage microorganisms in food processing: An overview. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108496] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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10
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Sun L, Liu LP, Wang YZ, Yang L, Zhang C, Yue MX, Dabbour M, Mintah BK, Wang L. Effect of ultrasonication on the metabolome and transcriptome profile changes in the fermentation of Ganoderma lucidum. Microbiol Res 2021; 254:126916. [PMID: 34798539 DOI: 10.1016/j.micres.2021.126916] [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: 07/01/2021] [Revised: 10/07/2021] [Accepted: 11/05/2021] [Indexed: 10/19/2022]
Abstract
Development of an efficient liquid fermentation method is helpful for food and pharmaceutical applications. This study investigated the effect of ultrasonication on the liquid fermentation of Ganoderma lucidum, a popular edible and medical fungi. Significant changes at both metabolic and transcriptional levels in mycelia were induced by ultrasound treatment. Compared with the control, 857 differential metabolites were identified (578 up- and 279 down-regulated metabolites), with more metabolites biosynthesis after sonication; 569 differentially expressed genes (DEGs) (267 up- and 302 down-) and 932 DEGs (378 up- and 554 down-) were identified in ultrasound-treated samples with recovery time of 0.5 and 3 h, respectively. Furthermore, 334 DEGs were continuously induced within the recovery time of 3 h, indicating the lasting influence of sonication on mycelia. The DEGs and differential metabolites were mainly involved in pathways of carbohydrate, energy metabolism, amino acids, terpenoids biosynthesis and metabolism and membrane transport, suggesting that ultrasound induced multifaceted effects on primary and secondary metabolism. Ultrasonication enhanced the triterpenoids production of G. lucidum (34.96 %) by up-regulating the expression of terpenoids synthase genes. This study shows that the application of ultrasound in liquid fermentation of G. lucidum is an efficient approach to produce more metabolites.
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Affiliation(s)
- Ling Sun
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Li-Ping Liu
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Ya-Zhen Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Lei Yang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Cunsheng Zhang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Mei-Xiang Yue
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Mokhtar Dabbour
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Benjamin Kumah Mintah
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
| | - Liang Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China.
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11
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Li W, Ma H, He R, Ren X, Zhou C. Prospects and application of ultrasound and magnetic fields in the fermentation of rare edible fungi. ULTRASONICS SONOCHEMISTRY 2021; 76:105613. [PMID: 34119905 PMCID: PMC8207300 DOI: 10.1016/j.ultsonch.2021.105613] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 04/30/2021] [Accepted: 05/27/2021] [Indexed: 05/14/2023]
Abstract
Ultrasound has the potential to be broadly applied in the field of agricultural food processing due to advantages such as environmental friendliness, low energy costs, no need for exogenous additives and ease of operation. High-frequency ultrasound is mainly used in medical diagnosis and in the food industry for the identification of ingredients and production line quality testing, while low-frequency ultrasounds is mainly used for extraction and separation, accelerating chemical reactions, auxiliary microbial fermentation and quality enhancement in food industry. Magnetic fields have many advantages of convenient use, such as non-toxic, nonpolluting and safe. High-intensity pulsed magnetic fields are widely used as a physical non-thermal sterilization technology in food processing, while weak magnetic fields are better at activating microorganisms and promoting their growth. Ultrasound and magnetic fields, due to their positive biological effects, have a wide range of applications in the food processing industry. This paper provides an overview of the research progress and applications of ultrasound and magnetic fields in food processing from the perspectives of their biological effects and mechanisms of action. Additionally, with the development and application of physical field technology, physical fields can now be used to provide significant technical advantages for assisting fermentation. Suitable physical fields can promote the growth of microbial cells, improve mycelial production and increase metabolic activity. Furthermore, the current status of research into the use of ultrasound and magnetic field technologies for assisting the fermentation of rare edible fungi, is discussed.
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Affiliation(s)
- Wen Li
- School of Food & Biological Engineering, Institute of Food Physical Processing, Jiangsu University, Zhenjiang 212013, China; Institute of Edible Fungi, Shanghai Academy of Agricultural Sciences, National Engineering Research Center of Edible Fungi, Key Laboratory of Edible Fungi Resources and Utilization (South), Ministry of Agriculture, Shanghai 201403, China
| | - Haile Ma
- School of Food & Biological Engineering, Institute of Food Physical Processing, Jiangsu University, Zhenjiang 212013, China.
| | - Ronghai He
- School of Food & Biological Engineering, Institute of Food Physical Processing, Jiangsu University, Zhenjiang 212013, China
| | - Xiaofeng Ren
- School of Food & Biological Engineering, Institute of Food Physical Processing, Jiangsu University, Zhenjiang 212013, China
| | - Cunshan Zhou
- School of Food & Biological Engineering, Institute of Food Physical Processing, Jiangsu University, Zhenjiang 212013, China
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12
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Wang Y, Gu X, Quan J, Xing G, Yang L, Zhao C, Wu P, Zhao F, Hu B, Hu Y. Application of magnetic fields to wastewater treatment and its mechanisms: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 773:145476. [PMID: 33588219 DOI: 10.1016/j.scitotenv.2021.145476] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 01/21/2021] [Accepted: 01/24/2021] [Indexed: 06/12/2023]
Abstract
Magnetic field (MF) has been applied widely and successfully as an efficient, low-cost and easy-to-use technique to enhance wastewater treatment (WWT) performance. Although the effects of MF on WWT were revealed and summarized by some works, they are still mysterious and complex. This review summarizes the application of MF in magnetic adsorption-separation of heavy metals and dyes, treatment of domestic wastewater and photo-magnetic coupling technology. Furthermore, the mechanisms of MF-enhanced WWT are critically elaborated from the perspective of magnetic physicochemical and biological effects, such as magnetoresistance, Lorentz force, and intracellular radical pair mechanism. At last, the challenges and opportunities for MF application in WWT are discussed. For overcoming the limitations and taking advantages of MFs in WWT, fundamental research of the mechanisms of the application of MFs should be carried out in the future.
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Affiliation(s)
- Yilin Wang
- School of Civil Engineering, Chang' an University, Xi'an, China; Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-rural Development, Chang' an University, Xi'an, China
| | - Xin Gu
- School of Civil Engineering, Chang' an University, Xi'an, China; Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-rural Development, Chang' an University, Xi'an, China
| | - Jianing Quan
- School of Civil Engineering, Chang' an University, Xi'an, China; Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-rural Development, Chang' an University, Xi'an, China
| | - Guohua Xing
- School of Civil Engineering, Chang' an University, Xi'an, China; Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-rural Development, Chang' an University, Xi'an, China
| | - Liwei Yang
- School of Civil Engineering, Chang' an University, Xi'an, China; Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-rural Development, Chang' an University, Xi'an, China
| | - Chuanliang Zhao
- School of Civil Engineering, Chang' an University, Xi'an, China; Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-rural Development, Chang' an University, Xi'an, China
| | - Pei Wu
- School of Civil Engineering, Chang' an University, Xi'an, China; Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-rural Development, Chang' an University, Xi'an, China
| | - Fan Zhao
- School of Civil Engineering, Chang' an University, Xi'an, China; Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-rural Development, Chang' an University, Xi'an, China
| | - Bo Hu
- School of Civil Engineering, Chang' an University, Xi'an, China; Key Laboratory of Water Supply & Sewage Engineering, Ministry of Housing and Urban-rural Development, Chang' an University, Xi'an, China.
| | - Yuansheng Hu
- School of Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland
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13
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Yang H, Zhang L, Li J, Jin Y, Zou J, Huang J, Zhou R, Huang M, Wu C. Cell surface properties and transcriptomic analysis of cross protection provided between heat adaptation and acid stress in Tetragenococcus halophilus. Food Res Int 2021; 140:110005. [PMID: 33648238 DOI: 10.1016/j.foodres.2020.110005] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 12/01/2020] [Accepted: 12/08/2020] [Indexed: 11/16/2022]
Abstract
Cross protection is a widely existed phenomenon in microorganisms which subjected to a mild stress develop tolerance to other stresses, yet the underlying mechanisms for this protection have not been fully elucidated. Here, we report that heat preadaptation induced cross protection against acid stress in Tetragenococcus halophilus, and the cross protective mechanisms were revealed based on cell surface characterizations and transcriptomic analysis. The results showed that heat preadaptation of T. halophilus at 45 °C for 1.5 h improved the acid tolerance of cells at pH 2.5, and the preadapted cells exhibited higher pHi compared with the un-preadapted cells during acid stress. Analysis of the cell surface properties suggested that the heat-treated cells displayed smoother surface, lower roughness and higher integrity than those of untreated cells. Meanwhile, the distributions of membrane fatty acids also changed in response to acid stress, and the treated cells reveled lower ratio of unsaturated to saturated fatty acids. RNA-Sequencing was employed to further elucidate the cross protective mechanism induced by heat preadaptation, and the results showed that the differentially expressed genes (DGEs) were mainly involved in cellular metabolism and membrane transport during heat preadaptation. A detailed analysis of gene expression profile of cells between heat treated and untreated revealed that genes associated with energy metabolism, amino acid metabolism and genetic information processing were induced upon heat stress. Results presented in this study may broaden our understanding on cross protection and provide a potential strategy to enhance the performance of cells during industrial processes.
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Affiliation(s)
- Huan Yang
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China; Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China
| | - Liang Zhang
- Luzhou Laojiao Group Co., Ltd, Luzhou 646000, China
| | - Jinsong Li
- Luzhou Laojiao Group Co., Ltd, Luzhou 646000, China
| | - Yao Jin
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China; Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China
| | | | - Jun Huang
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China; Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China
| | - Rongqing Zhou
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China; Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China
| | - Mingquan Huang
- Beijing Laboratory of Food Quality and Safety, Beijing Technology and Business University, Beijing 100048, China.
| | - Chongde Wu
- College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China; Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China; Beijing Laboratory of Food Quality and Safety, Beijing Technology and Business University, Beijing 100048, China.
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14
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Liu X, Shu Q, Chen Q, Pang X, Wu Y, Zhou W, Wu Y, Niu J, Zhang X. Antibacterial Efficacy and Mechanism of Mannosylerythritol Lipids-A on Listeria monocytogenes. Molecules 2020; 25:E4857. [PMID: 33096808 PMCID: PMC7587930 DOI: 10.3390/molecules25204857] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 10/09/2020] [Accepted: 10/20/2020] [Indexed: 12/22/2022] Open
Abstract
Mannosylerythritol lipids-A (MEL-A) is a novel biosurfactant with excellent surface activity and potential biomedical applications. In this study, we explored the antibacterial activity and the underlying mechanisms of MEL-A against the important food-borne pathogen Listeria monocytogenes. The bacterial growth and survival assays revealed a remarkable antibacterial activity of MEL-A. Since MEL-A is a biosurfactant, we examined the cell membrane integrity and morphological changes of MEL-A-treated bacteria by biochemical assays and flow cytometry analysis and electron microscopes. The results showed obvious damaging effects of MEL-A on the cell membrane and morphology. To further explore the antibacterial mechanism of MEL-A, a transcriptome analysis was performed, which identified 528 differentially expressed genes (DEGs). Gene ontology (GO) analysis revealed that the gene categories of membrane, localization and transport were enriched among the DEGs, and the analysis of the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways demonstrated significant changes in the maltodextrin ABC transporter system and stress response system. Furthermore, the growth of L. monocytogenes could also be significantly inhibited by MEL-A in milk, a model of a real food system, suggesting that MEL-A could be potentially applied as an natural antimicrobial agent to control food-borne pathogens in the food industry.
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Affiliation(s)
- Xiayu Liu
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd.866, Hangzhou 310058, China; (X.L.); (Q.S.); (Q.C.); (X.P.); (Y.W.); (W.Z.); (Y.W.)
| | - Qin Shu
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd.866, Hangzhou 310058, China; (X.L.); (Q.S.); (Q.C.); (X.P.); (Y.W.); (W.Z.); (Y.W.)
| | - Qihe Chen
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd.866, Hangzhou 310058, China; (X.L.); (Q.S.); (Q.C.); (X.P.); (Y.W.); (W.Z.); (Y.W.)
| | - Xinxin Pang
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd.866, Hangzhou 310058, China; (X.L.); (Q.S.); (Q.C.); (X.P.); (Y.W.); (W.Z.); (Y.W.)
| | - Yansha Wu
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd.866, Hangzhou 310058, China; (X.L.); (Q.S.); (Q.C.); (X.P.); (Y.W.); (W.Z.); (Y.W.)
| | - Wanyi Zhou
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd.866, Hangzhou 310058, China; (X.L.); (Q.S.); (Q.C.); (X.P.); (Y.W.); (W.Z.); (Y.W.)
| | - Yajing Wu
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd.866, Hangzhou 310058, China; (X.L.); (Q.S.); (Q.C.); (X.P.); (Y.W.); (W.Z.); (Y.W.)
| | - Jianrui Niu
- College of Agriculture and Forestry, Linyi University, Linyi 276005, China
| | - Xinglin Zhang
- Department of Food Science and Nutrition, Zhejiang University, Yuhangtang Rd.866, Hangzhou 310058, China; (X.L.); (Q.S.); (Q.C.); (X.P.); (Y.W.); (W.Z.); (Y.W.)
- College of Agriculture and Forestry, Linyi University, Linyi 276005, China
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15
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Impact of pulsed magnetic field treatment on enzymatic inactivation and quality of cloudy apple juice. Journal of Food Science and Technology 2020; 58:2982-2991. [PMID: 34294960 DOI: 10.1007/s13197-020-04801-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 08/11/2020] [Accepted: 09/15/2020] [Indexed: 10/23/2022]
Abstract
The effects of PMF (5-7 T, 5-30 pulses) on enzyme activity, pH, titratable acidity, soluble solids, color, ascorbic acid, total phenols and antioxidant activity (DPPH radical scavenging activity) of cloudy apple juice were evaluated. PMF inhibited activities of polyphenoloxidase (PPO), peroxidase (POD) and pectinmethylesterase (PME), but PPO was more sensitive to PMF than POD and PME. At the intensity of 6 T with 15 pulses, PPO and POD both exhibited the lowest residual activity (53.22 and 92.96%), while PME showed the lowest residual activity (83.01%) at 7 T with 30 pulses. No significant effect on soluble solids was found under all processing parameters, whereas significant decreases of ascorbic acid were observed at the intensity of 7 T with 5-30 pulses. PMF did not change pH, titratable acidity, color, total phenols and DPPH radical scavenging activity severely. These results suggest PMF can be a potential technology for enzymatic inactivation in apple juice with high retention of quality.
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