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Zhou W, Deng A, Fan X, Han Y, Gao Y, Yuan L, Zheng X, Xiong D, Xu X, Zhu G, Yang Z. Characterisation of a SapYZU11@ZnFe 2O 4 biosensor reveals its mechanism for the rapid and sensitive colourimetric detection of viable Staphylococcus aureus in food matrices. Food Microbiol 2024; 122:104560. [PMID: 38839236 DOI: 10.1016/j.fm.2024.104560] [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: 03/02/2024] [Revised: 05/02/2024] [Accepted: 05/07/2024] [Indexed: 06/07/2024]
Abstract
Although bacteriophage-based biosensors hold promise for detecting Staphylococcus aureus in food products in a timely, simple, and sensitive manner, the associated targeting mechanism of the biosensors remains unclear. Herein, a colourimetric biosensor SapYZU11@ZnFe2O4, based on a broad-spectrum S. aureus lytic phage SapYZU11 and a ZnFe2O4 nanozyme, was constructed, and its capacity to detect viable S. aureus in food was evaluated. Characterisation of SapYZU11@ZnFe2O4 revealed its effective immobilisation, outstanding biological activity, and peroxidase-like capability. The peroxidase activity of SapYZU11@ZnFe2O4 significantly decreased after the addition of S. aureus, potentially due to blockage of the nanozyme active sites. Moreover, SapYZU11@ZnFe2O4 can detect S. aureus from various sources and S. aureus isolates that phage SapYZU11 could not lyse. This may be facilitated by the adsorption of the special receptor-binding proteins on the phage tail fibre and wall teichoic acid receptors of S. aureus. Besides, SapYZU11@ZnFe2O4 exhibited remarkable sensitivity and specificity when employing colourimetric techniques to rapidly determine viable S. aureus counts in food samples, with a detection limit of 0.87 × 102 CFU/mL. Thus, SapYZU11@ZnFe2O4 has broad application prospects for the detection of viable S. aureus cells on food substrates.
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Affiliation(s)
- Wenyuan Zhou
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Aiping Deng
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Xiaoxing Fan
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Yeling Han
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Yajun Gao
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Lei Yuan
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Xiangfeng Zheng
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Dan Xiong
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Xuechao Xu
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Guoqiang Zhu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, China.
| | - Zhenquan Yang
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China; Yangzhou Engineering Research Center of Food Intelligent Packaging and Preservation Technology, Yangzhou University, Yangzhou, Jiangsu, 225127, China.
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Yammine J, Chihib NE, Gharsallaoui A, Dumas E, Ismail A, Karam L. Essential oils and their active components applied as: free, encapsulated and in hurdle technology to fight microbial contaminations. A review. Heliyon 2022; 8:e12472. [PMID: 36590515 PMCID: PMC9798198 DOI: 10.1016/j.heliyon.2022.e12472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 04/24/2022] [Accepted: 12/11/2022] [Indexed: 12/24/2022] Open
Abstract
Microbial contaminations are responsible for many chronic, healthcare, persistent microbial infections and illnesses in the food sector, therefore their control is an important public health challenge. Over the past few years, essential oils (EOs) have emerged as interesting alternatives to synthetic antimicrobials as they are biodegradable, extracted from natural sources and potent antimicrobials. Through their multiple mechanisms of actions and target sites, no microbial resistance has been developed against them till present. Although extensive documentation has been reported on the antimicrobial activity of EOs, comparisons between the use of whole EOs or their active components alone for an antimicrobial treatment are less abundant. It is also essential to have a good knowledge about EOs to be used as alternatives to the conventional antimicrobial products such as chemical disinfectants. Moreover, it is important to focus not only on planktonic vegetative microorganisms, but to study also the effect on more resistant forms like spores and biofilms. The present article reviews the current knowledge on the mechanisms of antimicrobial activities of EOs and their active components on microorganisms in different forms. Additionally, in this review, the ultimate advantages of encapsulating EOs or combining them with other hurdles for enhanced antimicrobial treatments are discussed.
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Affiliation(s)
- Jina Yammine
- Univ Lille, CNRS, INRAE, Centrale Lille, UMR 8207 – UMET – Unité Matériaux et Transformations, Lille, France,Plateforme de Recherches et d’Analyses en Sciences de l’Environnement (PRASE), Ecole Doctorale des Sciences et Technologies, Université Libanaise, Hadath, Lebanon
| | - Nour-Eddine Chihib
- Univ Lille, CNRS, INRAE, Centrale Lille, UMR 8207 – UMET – Unité Matériaux et Transformations, Lille, France
| | - Adem Gharsallaoui
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, LAGEPP UMR 5007, Villeurbanne, France
| | - Emilie Dumas
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, LAGEPP UMR 5007, Villeurbanne, France
| | - Ali Ismail
- Plateforme de Recherches et d’Analyses en Sciences de l’Environnement (PRASE), Ecole Doctorale des Sciences et Technologies, Université Libanaise, Hadath, Lebanon
| | - Layal Karam
- Human Nutrition Department, College of Health Sciences, QU Health, Qatar University, Doha, Qatar,Corresponding author.
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Trinh KTL, Lee NY. Recent Methods for the Viability Assessment of Bacterial Pathogens: Advances, Challenges, and Future Perspectives. Pathogens 2022; 11:pathogens11091057. [PMID: 36145489 PMCID: PMC9500772 DOI: 10.3390/pathogens11091057] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/14/2022] [Accepted: 09/15/2022] [Indexed: 11/28/2022] Open
Abstract
Viability assessment is a critical step in evaluating bacterial pathogens to determine infectious risks to public health. Based on three accepted viable criteria (culturability, metabolic activity, and membrane integrity), current viability assessments are categorized into three main strategies. The first strategy relies on the culturability of bacteria. The major limitation of this strategy is that it cannot detect viable but nonculturable (VBNC) bacteria. As the second strategy, based on the metabolic activity of bacteria, VBNC bacteria can be detected. However, VBNC bacteria sometimes can enter a dormant state that allows them to silence reproduction and metabolism; therefore, they cannot be detected based on culturability and metabolic activity. In order to overcome this drawback, viability assessments based on membrane integrity (third strategy) have been developed. However, these techniques generally require multiple steps, bulky machines, and laboratory technicians to conduct the tests, making them less attractive and popular applications. With significant advances in microfluidic technology, these limitations of current technologies for viability assessment can be improved. This review summarized and discussed the advances, challenges, and future perspectives of current methods for the viability assessment of bacterial pathogens.
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Affiliation(s)
- Kieu The Loan Trinh
- Department of Industrial Environmental Engineering, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si 13120, Korea
| | - Nae Yoon Lee
- Department of BioNano Technology, Gachon University, 1342 Seongnam-daero, Sujeong-gu, Seongnam-si 13120, Korea
- Correspondence:
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PCR Mediated Nucleic Acid Molecular Recognition Technology for Detection of Viable and Dead Foodborne Pathogens. Foods 2022; 11:foods11172675. [PMID: 36076861 PMCID: PMC9455676 DOI: 10.3390/foods11172675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/23/2022] [Accepted: 08/28/2022] [Indexed: 11/17/2022] Open
Abstract
Living foodborne pathogens pose a serious threat to public and population health. To ensure food safety, it is necessary to complete the detection of viable bacteria in a short time (several hours to 1 day). However, the traditional methods by bacterial culture, as the gold standard, are cumbersome and time-consuming. To break through the resultant research bottleneck, PCR mediated nucleic acid molecular recognition technologies, including RNA-based reverse transcriptase PCR (RT-PCR) and DNA-based viability PCR (vPCR) have been developed in recent years. They not only sensitively amplify detection signals and quickly report detection results, but also distinguish viable and dead bacteria. Therefore, this review introduces these PCR-mediated techniques independent of culture for viable and dead foodborne pathogen detection from the nucleic acid molecular recognition principal level and describes their whole-process applications in food quality supervision, which provides a useful reference for the development of detection of foodborne pathogens in the future.
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Rapid and visual detection of viable Staphylococcus aureus in pork and pork products by PMA and saltatory rolling circle amplification. Eur Food Res Technol 2022. [DOI: 10.1007/s00217-022-03990-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Chen NT, Cheong NS, Lin CY, Tseng CC, Su HJ. Ambient viral and bacterial distribution during long-range transport in Northern Taiwan. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 270:116231. [PMID: 33360070 DOI: 10.1016/j.envpol.2020.116231] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 11/30/2020] [Accepted: 12/03/2020] [Indexed: 06/12/2023]
Abstract
Long-range transport (LRT) reportedly carries air pollutants and microorganisms to downwind areas. LRT can be of various types, such as dust storm (DS) and frontal pollution (FP); however, studies comparing their effects on bioaerosols are lacking. This study evaluated the effect of LRT on viral and bacterial concentrations in Northern Taiwan. When LRT occurred and possibly affected Taiwan from August 2013 to April 2014, air samples (before, during, and after LRT) were collected in Cape Fugui (CF, Taiwan's northernmost point) and National Taiwan University (NTU). Reverse-transcription quantitative polymerase chain reaction (RT-qPCR) was applied to quantify influenza A virus. qPCR and qPCR coupled with propidium monoazide were, respectively, used to quantify total and viable bacteria. Types and occurrence of LRT were confirmed according to the changing patterns of meteorological factors and air pollution, air mass sources (HYSPLIT model), and satellite images. Two Asian DS and three FP cases were included in this study. Influenza A virus was detected only on days before and during FP occurred on January 3-5, 2014, with concentrations of 0.87 and 10.19 copies/m3, respectively. For bacteria, the increase in concentrations of total and viable cells during Asian DSs (17-19 and 25-29 November 2013) was found at CF only (from 3.13 to 3.40 and from 2.62 to 2.85 log copies/m3, respectively). However, bacterial levels at NTU and CF both increased during FP and lasted for 2 days after FP. In conclusion, LRT increased the levels of influenza A virus and bacteria in the ambient air of Northern Taiwan, particularly at CF. During and 2 days (at least) after LRT, people should avoid outdoor activities, especially in case of FP.
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Affiliation(s)
- Nai-Tzu Chen
- Research Center of Environmental Trace Toxic Substances, National Cheng Kung University, Tainan, Taiwan
| | - Ngok-Song Cheong
- Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chuan-Yao Lin
- Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan
| | - Chun-Chieh Tseng
- Department and Graduate Institute of Public Health, Tzu Chi University, Hualien, Taiwan
| | - Huey-Jen Su
- Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
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A Novel, Rapid, and Simple PMA-qPCR Method for Detection and Counting of Viable Brucella Organisms. J Vet Res 2020; 64:253-261. [PMID: 32587912 PMCID: PMC7305652 DOI: 10.2478/jvetres-2020-0033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 04/28/2020] [Indexed: 11/20/2022] Open
Abstract
Introduction The plate counting method widely used at present to discern viable from non-viable Brucella in the host or cell is time-consuming and laborious. Therefore, it is necessary to establish a rapid, simple method for detecting and counting viable Brucella organisms. Material and Methods Using propidium monoazide (PMA) to inhibit amplification of DNA from dead Brucella, a novel, rapid PMA-quantitative PCR (PMA-qPCR) detection method for counting viable Brucella was established. The standard recombinant plasmid with the target BCSP31 gene fragment inserted was constructed for drawing a standard curve. The reaction conditions were optimised, and the sensitivity, specificity, and repeatability were analysed. Results The optimal exposure time and working concentration of PMA were 10 min and 15 μg/mL, respectively. The correlation coefficient (R2) of the standard curve was 0.999. The sensitivity of the method was 103 CFU/mL, moreover, its specificity and repeatability also met the requirements. The concentration of B. suis measured by the PMA-qPCR did not differ significantly from that measured by the plate counting method, and the concentrations of viable bacteria in infected cells determined by the two methods were of the same order of magnitude. Conclusion In this study, a rapid and simple PMA-qPCR counting method for viable Brucella was established, which will facilitate related research.
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Lv R, Wang K, Feng J, Heeney DD, Liu D, Lu X. Detection and Quantification of Viable but Non-culturable Campylobacter jejuni. Front Microbiol 2020; 10:2920. [PMID: 31998253 PMCID: PMC6965164 DOI: 10.3389/fmicb.2019.02920] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 12/04/2019] [Indexed: 12/14/2022] Open
Abstract
Campylobacter can enter a viable but non-culturable (VBNC) state to evade various stresses, and this state is undetectable using traditional microbiological culturing techniques. These VBNC bacterial cells retain metabolism and demonstrate pathogenic potential due to their ability to resuscitate under favorable conditions. Rapid and accurate determination of VBNC Campylobacter is critical to further understand the induction and resuscitation of the dormancy state of this microbe in the agri-food system. Here, we integrated propidium monoazide (PMA) with real-time polymerase chain reaction (qPCR) targeting the rpoB gene to detect and quantify Campylobacter jejuni in the VBNC state. First, we optimized the concentration of PMA (20 μM) that could significantly inhibit the amplification of dead cells by qPCR with no significant interference on the amplification of viable cell DNA. PMA-qPCR was highly specific to C. jejuni with a limit of detection (LOD) of 2.43 log CFU/ml in pure bacterial culture. A standard curve for C. jejuni cell concentrations was established with the correlation coefficient of 0.9999 at the linear range of 3.43 to 8.43 log CFU/ml. Induction of C. jejuni into the VBNC state by osmotic stress (i.e., 7% NaCl) was rapid (<48 h) and effective (>10% population). The LOD of PMA-qPCR for VBNC C. jejuni exogenously applied to chicken breasts was 3.12 log CFU/g. In conclusion, PMA-qPCR is a rapid, specific, and sensitive method for the detection and quantification of VBNC C. jejuni in poultry products. This technique can give insight into the prevalence of VBNC Campylobacter in the environment and agri-food production system.
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Affiliation(s)
- Ruiling Lv
- Food, Nutrition, and Health Program, Faculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada.,College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China
| | - Kaidi Wang
- Food, Nutrition, and Health Program, Faculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada
| | - Jinsong Feng
- Food, Nutrition, and Health Program, Faculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada
| | - Dustin D Heeney
- Food, Nutrition, and Health Program, Faculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada
| | - Donghong Liu
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, China
| | - Xiaonan Lu
- Food, Nutrition, and Health Program, Faculty of Land and Food Systems, The University of British Columbia, Vancouver, BC, Canada
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Dong K, Pan H, Yang D, Rao L, Zhao L, Wang Y, Liao X. Induction, detection, formation, and resuscitation of viable but non‐culturable state microorganisms. Compr Rev Food Sci Food Saf 2019; 19:149-183. [DOI: 10.1111/1541-4337.12513] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 10/21/2019] [Accepted: 11/14/2019] [Indexed: 01/05/2023]
Affiliation(s)
- Kai Dong
- Beijing Advanced Innovation Center for Food Nutrition and Human HealthCollege of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- College of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- Key Lab of Fruit and Vegetable ProcessingMinistry of Agriculture and Rural Affairs Beijing China
| | - Hanxu Pan
- Beijing Advanced Innovation Center for Food Nutrition and Human HealthCollege of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- College of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- Key Lab of Fruit and Vegetable ProcessingMinistry of Agriculture and Rural Affairs Beijing China
| | - Dong Yang
- Beijing Advanced Innovation Center for Food Nutrition and Human HealthCollege of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- College of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- Key Lab of Fruit and Vegetable ProcessingMinistry of Agriculture and Rural Affairs Beijing China
| | - Lei Rao
- Beijing Advanced Innovation Center for Food Nutrition and Human HealthCollege of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- College of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- Key Lab of Fruit and Vegetable ProcessingMinistry of Agriculture and Rural Affairs Beijing China
| | - Liang Zhao
- College of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- Key Lab of Fruit and Vegetable ProcessingMinistry of Agriculture and Rural Affairs Beijing China
| | - Yongtao Wang
- College of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- Key Lab of Fruit and Vegetable ProcessingMinistry of Agriculture and Rural Affairs Beijing China
| | - Xiaojun Liao
- Beijing Advanced Innovation Center for Food Nutrition and Human HealthCollege of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- College of Food Science and Nutritional EngineeringChina Agricultural University Beijing China
- Key Lab of Fruit and Vegetable ProcessingMinistry of Agriculture and Rural Affairs Beijing China
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Kozajda A, Jeżak K, Kapsa A. Airborne Staphylococcus aureus in different environments-a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:34741-34753. [PMID: 31654301 PMCID: PMC6900272 DOI: 10.1007/s11356-019-06557-1] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 09/23/2019] [Indexed: 05/22/2023]
Abstract
The aim of the literature review was to describe the environments where the presence of airborne Staphylococcus aureus was confirmed and to catalogue the most often used methods and conditions of bioaerosol sampling to identify the bacteria. The basis for searching of studies on S. aureus in the bioaerosol in different environments was PubMed database resources from the years 1990-2019 (May). The review included studies which were carried on in selected environments: hospitals and other health care facilities, large-scale animal breeding, wastewater treatment plants, residential areas, educational institutions, and other public places. The highest concentrations and genetic diversity of identified S. aureus strains, including MRSA (methicillin-resistant S. aureus), have been shown in large-scale animal breeding. The role of the airborne transmission in dissemination of infection caused by these pathogens is empirically confirmed in environmental studies. Commonly available, well-described, and relatively inexpensive methods of sampling, identification, and subtyping guarantee a high reliability of results and allow to obtain fast and verifiable outcomes in environmental studies on air transmission routes of S. aureus strains.
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Affiliation(s)
- Anna Kozajda
- Nofer Institute of Occupational Medicine, 8 Teresy Str, 91-348, Łódź, Poland.
| | - Karolina Jeżak
- Nofer Institute of Occupational Medicine, 8 Teresy Str, 91-348, Łódź, Poland
| | - Agnieszka Kapsa
- Nofer Institute of Occupational Medicine, 8 Teresy Str, 91-348, Łódź, Poland
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Liang T, Zhou P, Zhou B, Xu Q, Zhou Z, Wu X, Aguilar ZP, Xu H. Simultaneous quantitative detection of viable Escherichia coli O157:H7, Cronobacter spp., and Salmonella spp. using sodium deoxycholate-propidium monoazide with multiplex real-time PCR. J Dairy Sci 2019; 102:2954-2965. [DOI: 10.3168/jds.2018-15736] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Accepted: 12/20/2018] [Indexed: 01/18/2023]
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12
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Huang Z, Zheng J, Shi C, Chen Q. Flow cytometry-based method facilitates optimization of PMA treatment condition for PMA-qPCR method. Mol Cell Probes 2018; 40:37-39. [PMID: 29792916 DOI: 10.1016/j.mcp.2018.05.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 05/10/2018] [Accepted: 05/21/2018] [Indexed: 11/18/2022]
Abstract
Coupling propidium monoazide (PMA) with quantitative PCR (PMA-qPCR) has been successfully applied to specific detection and quantification of viable cells in various samples. The optimal PMA treatment condition is usually determined through qPCR. However, it is a tedious, time consuming and costly process including DNA extraction and qPCR. To overcome this problem, a flow cytometry-based (FCM-based) method was first proposed in this study to replace qPCR for screening of the optimal PMA treatment condition for Helicobacter pylori, since the pure culture treated with PMA was actually a single cell suspension with fluorescent dye. Results showed that the optimal PMA treatment condition (30 μM of PMA and 8 min of exposure time) determined by the novel method was the same as that determined by the qPCR-based method, which demonstrate the feasibility of this approach. In addition, with the comparison of the qPCR-based method, the FCM-based method allows screening of the optimal PMA treatment condition become much more simple, rapid and economical.
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Affiliation(s)
- Zhiqing Huang
- Fujian Medical University Union Hospital, Fuzhou, Fujian Province 350001, China
| | - Jianwei Zheng
- Fujian Medical University Union Hospital, Fuzhou, Fujian Province 350001, China
| | - Chunmei Shi
- Fujian Medical University Union Hospital, Fuzhou, Fujian Province 350001, China
| | - Qiang Chen
- Fujian Medical University Union Hospital, Fuzhou, Fujian Province 350001, China; Fujian Medical University Stem Cell Research Institute, Fuzhou, Fujian Province 350004, China.
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