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Liu Y, Wei C, Wan H, Sarengaowa, Liang X, Jiang T, Dong Y, Zhao X, Zhong T. Preliminary Study on Rapid and Simultaneous Detection of Viable Escherichia coli O157:H7, Staphylococcus aureus, and Salmonella by PMA-mPCR in Food. Molecules 2023; 28:5835. [PMID: 37570805 DOI: 10.3390/molecules28155835] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 07/25/2023] [Accepted: 07/31/2023] [Indexed: 08/13/2023] Open
Abstract
Escherichia coli O157:H7, Staphylococcus aureus, and Salmonella are major foodborne pathogens that are widespread in nature and responsible for several outbreaks of food safety accidents. Thus, a rapid and practical technique (PMA-mPCR) was developed for the simultaneous detection of viable E. coli O157:H7, S. aureus, and Salmonella in pure culture and in a food matrix. To eliminate false positive results, propidium monoazide (PMA) was applied to selectively suppress the DNA amplification of dead cells. The results showed the optimum concentration of PMA is 5.0 µg/mL. The detection limit of this assay by mPCR was 103 CFU/mL in the culture broth, and by PMA-mPCR was 104 CFU/mL both in pure culture and a food matrix (milk and ground beef). In addition, the detection of mixed viable and dead cells was also explored in this study. The detection sensitivity ratio of viable and dead counts was less than 1:10. Therefore, the PMA-mPCR assay proposed here might provide an efficient detection tool for the simultaneous detection of viable E. coli O157:H7, S. aureus, and Salmonella and also have great potential for the detection and concentration assessment of VBNC cells.
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Affiliation(s)
- Yao Liu
- School of Pharmacy and Food Science, Zhuhai College of Science and Technology, Zhuhai 519041, China
| | - Caijiao Wei
- School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan 430205, China
| | - Hui Wan
- Nanchang Agricultural Technology Popularization Center, Nanchang 330299, China
| | - Sarengaowa
- School of Pharmacy and Food Science, Zhuhai College of Science and Technology, Zhuhai 519041, China
| | - Xiaoping Liang
- School of Pharmacy and Food Science, Zhuhai College of Science and Technology, Zhuhai 519041, China
| | - Tao Jiang
- School of Pharmacy and Food Science, Zhuhai College of Science and Technology, Zhuhai 519041, China
- Faculty of Medicine, Macau University of Science and Technology, Taipa, Macao 999078, China
| | - Yuhe Dong
- Faculty of Medicine, Macau University of Science and Technology, Taipa, Macao 999078, China
| | - Xihong Zhao
- School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan 430205, China
| | - Tian Zhong
- Faculty of Medicine, Macau University of Science and Technology, Taipa, Macao 999078, China
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Hu YQ, Wang WY, Turmidzi F, Li FX, Fang LF, Zhou ZH, Zhang DF. Rapid and simultaneous detection of viable Vibrio parahaemolyticus, Vibrio alginolyticus, and Vibrio cholerae by PMA-mPCR assay in aquatic products. Lebensm Wiss Technol 2023. [DOI: 10.1016/j.lwt.2023.114663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
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Miotto M, Barretta C, Ossai SO, da Silva HS, Kist A, Vieira CRW, Parveen S. Optimization of a propidium monoazide-qPCR method for Escherichia coli quantification in raw seafood. Int J Food Microbiol 2020; 318:108467. [PMID: 31835094 DOI: 10.1016/j.ijfoodmicro.2019.108467] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 11/13/2019] [Accepted: 11/30/2019] [Indexed: 11/15/2022]
Abstract
The present study compared different concentrations of propidium monoazide (PMA), time of exposure to light and different light intensities to determine the optimal conditions for the quantification of viable Escherichia coli in cell suspension and in food matrix. The influence of cell density and the effectiveness of PMA in viable but non-culturable (VBNC) E. coli cells were evaluated and also applied in food matrix. For that purpose, different concentrations of PMA (20 μM, 40 μM, 50 μM, 60 μM and 80 μM) under different times of exposure (5 min, 10 min, 15 min, 20 min and 30 min) to lights of different intensities (500 W and 650 W) were evaluated. After determining the optimal conditions, the PMA-qPCR methods were applied to different compositions of live and heat-killed E. coli suspensions (v:v; 0:1; 1:0; 1:1) in concentrations ranging from 3 Log to 7 Log CFU/mL. The same dilutions were prepared with E. coli in VBNC state and applied in food matrix. The results obtained from qPCR, PMA-qPCR and plate counts were compared. The results suggested that a PMA treatment of 50 μM PMA for 15 min under 650 W light intensity was optimal under our conditions. For E. coli cell suspensions, the amplification of heat-killed cells was inhibited greatly by PMA when concentrations were ≤ 5 Log CFU/mL. For the samples of oyster inoculated with heat-killed cells, E. coli was not detected by PMA-qPCR in concentrations ≤4 Log CFU/g. Regarding the results with VBNC state, we considered the PMA-qPCR method to be applicable for enumerating E. coli VBNC cells in oyster samples. Based on our findings, we further recommend the use of PMA-qPCR with the aim of reducing the amplification of dead cells for improving its performance, since false-positives could still occur depending on the level of E. coli in the sample. The application of the PMA-qPCR for quantification of bacteria, compared to the use of culture-dependent methods, is quite promising. However, further studies are recommended, especially using different food matrices.
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Affiliation(s)
- Marilia Miotto
- Department of Food Science and Technology, Federal University of Santa Catarina, 1346 Admar Gonzaga, 88034-001 Florianopolis, Santa Catarina, Brazil.
| | - Clarissa Barretta
- Department of Food Science and Technology, Federal University of Santa Catarina, 1346 Admar Gonzaga, 88034-001 Florianopolis, Santa Catarina, Brazil
| | - Sylvia O Ossai
- Food Science and Technology Program, University of Maryland Eastern Shore, 2116 Backbone Road, 21853 Princess Anne, MD, United States
| | - Helen Silvestre da Silva
- Department of Food Science and Technology, Federal University of Santa Catarina, 1346 Admar Gonzaga, 88034-001 Florianopolis, Santa Catarina, Brazil
| | - Airton Kist
- Laboratory of Computational and Applied Statistics, Department of Mathematics and Statistics, State University of Ponta Grossa, 4748 Gen. Carlos Cavalcanti, 84030-900 Ponta Grossa, Parana, Brazil
| | - Cleide Rosana Werneck Vieira
- Department of Food Science and Technology, Federal University of Santa Catarina, 1346 Admar Gonzaga, 88034-001 Florianopolis, Santa Catarina, Brazil
| | - Salina Parveen
- Food Science and Technology Program, University of Maryland Eastern Shore, 2116 Backbone Road, 21853 Princess Anne, MD, United States
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Li Y, Huang TY, Ye C, Chen L, Liang Y, Wang K, Liu J. Formation and Control of the Viable but Non-culturable State of Foodborne Pathogen Escherichia coli O157:H7. Front Microbiol 2020; 11:1202. [PMID: 32612584 PMCID: PMC7308729 DOI: 10.3389/fmicb.2020.01202] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Accepted: 05/12/2020] [Indexed: 02/05/2023] Open
Abstract
As a common foodborne pathogen, Escherichia coli O157:H7 produces toxins causing serious diseases. However, traditional methods failed in detecting E. coli O157:H7 cells in the viable but non-culturable (VBNC) state, which poses a threat to food safety. This study aimed at investigating the formation, control, and detection of the VBNC state of E. coli O157:H7. Three factors including medium, salt, and acid concentrations were selected as a single variation. Orthogonal experiments were designed with three factors and four levels, and 16 experimental schemes were used. The formation of the VBNC state was examined by agar plate counting and LIVE/DEAD® BacLightTM bacterial viability kit with fluorescence microscopy. According to the effects of environmental conditions on the formation of the VBNC state of E. coli O157:H7, the inhibition on VBNC state formation was investigated. In addition, E. coli in the VBNC state in food samples (crystal cake) was detected by propidium monoazide-polymerase chain reaction (PMA-PCR) assays. Acetic acid concentration showed the most impact on VBNC formation of E. coli O157:H7, followed by medium and salt concentration. The addition of 1.0% acetic acid could directly kill E. coli O157:H7 and eliminate its VBNC formation. In crystal cake, 25, 50, or 100% medium with 1.0% acetic acid could inhibit VBNC state formation and kill E. coli O157:H7 within 3 days. The VBNC cell number was reduced by adding 1.0% acetic acid. PMA-PCR assay could be used to detect E. coli VBNC cells in crystal cake with detection limit at 104 CFU/ml. The understanding on the inducing and inhibitory conditions for the VBNC state of E. coli O157:H7 in a typical food system, as well as the development of an efficient VBNC cell detection method might aid in the control of VBNC E. coli O157:H7 cells in the food industry.
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Affiliation(s)
- Yanmei Li
- Department of Haematology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Teng-Yi Huang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Congxiu Ye
- Department of Dermato-Venereology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Ling Chen
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, China
| | - Yi Liang
- Guangdong Zhongqing Font Biochemical Science and Technology Co. Ltd., Maoming, China
| | - Kan Wang
- Research Center for Translational Medicine, The Second Affiliated Hospital, Medical College of Shantou University, Shantou, China
- *Correspondence: Junyan Liu,
| | - Junyan Liu
- Department of Civil and Environmental Engineering, A. James Clark School of Engineering, University of Maryland, College Park, MD, United States
- Kan Wang,
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Quantitative detection of viable Escherichia coli O157:H7 using a photoreactive DNA-binding dye propidium monoazide in irrigation water. Biochem Eng J 2019. [DOI: 10.1016/j.bej.2019.107354] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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