1
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Conventional and Emerging Techniques for Detection of Foodborne Pathogens in Horticulture Crops: a Leap to Food Safety. FOOD BIOPROCESS TECH 2022. [DOI: 10.1007/s11947-021-02730-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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2
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Shi XJ, Liu G, Zhang M, Zhao J, Li H, Yang Z, Bai H, Liang P, Lu Y. Membrane-sensitive bacterial DNA extractions and absolute quantitation of recovery efficiencies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 708:135125. [PMID: 31812430 DOI: 10.1016/j.scitotenv.2019.135125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 10/21/2019] [Accepted: 10/21/2019] [Indexed: 06/10/2023]
Abstract
Absolute quantification of waterborne pathogens is mandatory for microbiological risk assessment (MRA). Determination of the DNA recovery efficiency is an essential step before the quantitative molecular measurements, which has been largely ignored. In this study, we compared the DNA recovery efficiency and quality of five extraction methods, including two modified phenol-chloroform-based extractions with mechanical shearing and three commercial kits for the extraction of DNA from indigenous mixed-bacteria culture of river water. All of the methods gave relatively satisfying results from the pelleted sample through centrifugation. However, the commercial kits provided surprisingly low DNA yields for membrane-filtered samples because of DNA trapping and/or absorption on the membrane. Integrating with enzymatic lysis, bath sonication, phenol extraction, and alcohol precipitation achieved highest DNA yields and an acceptable DNA integrity for quantitative PCR. A plasmid containing the human GADPH gene fragment was demonstrated to be a suitable spiking control for determining the absolute DNA recovery efficiency. The unexpectedly low efficiencies of commercial kit extractions imply the significant underestimation of pathogenic bacteria in previous studies, which should gain enough concern in the area of pathogen monitoring in the future.
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Affiliation(s)
- Xiao Jie Shi
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Gang Liu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Mengyu Zhang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Jinbo Zhao
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China
| | - Huijun Li
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Zichao Yang
- Beijing North Canal Management Division, China
| | - Huiwen Bai
- Beijing North Canal Management Division, China
| | - Pu Liang
- Beijing North Canal Management Division, China
| | - Yun Lu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
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3
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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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4
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Development and application of a real-time polymerase chain reaction method for quantification of Escherichia coli in oysters (Crassostrea gigas). Food Microbiol 2019; 77:85-92. [DOI: 10.1016/j.fm.2018.08.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 07/30/2018] [Accepted: 08/31/2018] [Indexed: 11/17/2022]
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5
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Ripolles-Avila C, Cervantes-Huaman B, Hascoët A, Yuste J, Rodríguez-Jerez J. Quantification of mature Listeria monocytogenes biofilm cells formed by an in vitro model: A comparison of different methods. Int J Food Microbiol 2019; 289:209-214. [DOI: 10.1016/j.ijfoodmicro.2018.10.020] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 10/04/2018] [Accepted: 10/23/2018] [Indexed: 01/04/2023]
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6
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Impact of weather conditions, leaf age and irrigation water disinfection on the major epiphytic bacterial genera of baby spinach grown in an open field. Food Microbiol 2018; 78:46-52. [PMID: 30497607 DOI: 10.1016/j.fm.2018.09.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 08/27/2018] [Accepted: 09/24/2018] [Indexed: 12/21/2022]
Abstract
The effects of factors such as weather conditions, leaf age and irrigation water disinfection on the main bacterial genera (total bacterial, Enterobacteriaceae and Pseudomonas) of baby spinach were studied. Culture-dependent and independent quantification techniques were compared. Cultivation was carried out over two consecutive trials in commercial open field divided in two plots: 1) baby spinach irrigated with untreated surface water and 2) baby spinach irrigated with chlorine dioxide (ClO2) treated water. In all the cases, higher concentrations of bacteria were detected using molecular quantification in comparison with culture dependent techniques. Based on the obtained results, wind speed, solar radiation and relative humidity seem to have an impact on the levels of total bacterial, Enterobacteriaceae and Pseudomonas during cultivation of baby spinach. However, further studies would be needed to confirm this tendency. Water disinfection treatments (ClO2), when applied to irrigation water, impacted differently the bacterial genera evaluated in the present study. Thus, although no significant effects were observed in total bacterial enumerations of baby spinach irrigated with ClO2 treated water; significant reductions were detected in Enterobacteriaceae (19%) and Pseudomonas spp. (14%) levels. These results were also confirmed using specific culture-dependent methods. On the other hand, leaf age did not influence the levels of the main bacterial genera of baby spinach. Considering that, a large proportion of foodborne and pathogenic bacteria associated to fresh produce belong to the Enterobacteriaceae family and Pseudomonas genera, reductions in these bacterial groups could be beneficial. However, these groups are very diverse, making difficult to link the measurement of Enterobacteriaceae and Pseudomonas levels with the presence/abundance of potential pathogenic and spoilage microorganisms.
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7
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Godínez-Oviedo A, Nava GM, Arvizu-Medrano SM, Hernández-Iturriaga M. An Improve Protocol for PCR Using LM1 and LM2 Primers for Listeria monocytogenes Detection in Food Matrices. Pol J Microbiol 2018; 66:255-257. [PMID: 28735310 DOI: 10.5604/01.3001.0010.7869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Several studies have observed that a conventional PCR protocol using primers LM1 and LM2 for the identification of gene hlyA Listeria monocytogenes generates non-specific PCR amplifications and false positives. For this reason in this study, we provide a modified PCR protocol that improves the specificity of the LM1 and LM2 primers.
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Affiliation(s)
- Angélica Godínez-Oviedo
- Microbial Food Safety Group, Food Research Department, Faculty of Chemistry, Universidad Autonoma de Queretaro, Queretaro, Mexico
| | - Gerardo M Nava
- Microbial Food Safety Group, Food Research Department, Faculty of Chemistry, Universidad Autonoma de Queretaro, Queretaro, Mexico
| | - Sofía M Arvizu-Medrano
- Microbial Food Safety Group, Food Research Department, Faculty of Chemistry, Universidad Autonoma de Queretaro, Queretaro, Mexico
| | - Montserrat Hernández-Iturriaga
- Microbial Food Safety Group, Food Research Department, Faculty of Chemistry, Universidad Autonoma de Queretaro, Queretaro, Mexico
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8
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Truchado P, Gil MI, Reboleiro P, Rodelas B, Allende A. Impact of solar radiation exposure on phyllosphere bacterial community of red-pigmented baby leaf lettuce. Food Microbiol 2017; 66:77-85. [PMID: 28576376 DOI: 10.1016/j.fm.2017.03.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 03/24/2017] [Accepted: 03/29/2017] [Indexed: 11/27/2022]
Abstract
Solar radiation has been identified as a stress factor affecting phyllosphere associated bacteria colonization and survival during primary production. In the present study, the impact of different solar radiation doses on the phyllosphere microbiota of red-pigmented baby leaf lettuce cultivated in open field under commercial conditions was evaluated. Four weeks before harvest, the growing field was divided into four plots; each one was consecutively covered with one-week-interval with a light-excluding plastic to reduce the sunlight exposure. Four different solar radiation treatments were generated and cumulative photosynthetically active radiation (PAR) was used to differentiate treatments as follows: 4889 ± 428 μmol/m2/s (uncovered), 4265 ± 356 μmol/m2/s (covered for 1 week), 3602 ± 225 μmol/m2/s (covered for 2 weeks) and 3115 ± 313 μmol/m2/s (covered for 3 weeks). The size and composition of the phyllosphere bacterial community were determined by cultivation-depended (plate count) and independent (qPCR) techniques. Exposure to decreased levels of cumulative PAR did not produce significant differences in total bacterial community size, regardless of the chosen quantification techniques. However, total bacteria size quantified by qPCR was around 3.5 orders of magnitude higher than those obtained by plate count. The observed differences between cultivation-depended and independent techniques could be attributed to the presence of non-viable or viable but non-culturable (VBNC) bacteria. The bacterial community structure was analyzed using temperature gradient gel electrophoresis (TGGE), and significant differences were detected when the four solar treatment were compared. A qPCR approach was applied to the quantification of specific bacterial phyla and classes, previously identified in the phyllosphere of plants available literature, confirming that Proteobacteria, Bacteroidetes, Actinobacterias and Firmicutes were the most abundantly represented phyla in lettuce. Treatment comparison revealed higher proportions of Gammaproteobacteria as opposed to the Betaproteobacteria on the lettuce exposed to the lowest cumulative PAR dose (3115 ± 313 μmol/m2/s). The obtained results demonstrated that the solar radiation is a relevant environmental factor influencing the relative abundance of specific-groups of phyllosphere-associated bacteria in pigmented baby leaf lettuce.
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Affiliation(s)
- Pilar Truchado
- Research Group on Quality, Safety and Bioactivity of Plant Foods, CEBAS-CSIC, Campus Universitario de Espinardo, 25, 30100, Murcia, Spain
| | - M Isabel Gil
- Research Group on Quality, Safety and Bioactivity of Plant Foods, CEBAS-CSIC, Campus Universitario de Espinardo, 25, 30100, Murcia, Spain
| | - Patricia Reboleiro
- Departamento de Microbiología, Facultad de Farmacia, Universidad de Granada, Granada, Spain; Instituto del Agua, Universidad de Granada, Granada, Spain
| | - Belén Rodelas
- Departamento de Microbiología, Facultad de Farmacia, Universidad de Granada, Granada, Spain; Instituto del Agua, Universidad de Granada, Granada, Spain
| | - Ana Allende
- Research Group on Quality, Safety and Bioactivity of Plant Foods, CEBAS-CSIC, Campus Universitario de Espinardo, 25, 30100, Murcia, Spain.
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9
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Zhou B, Liang T, Zhan Z, Liu R, Li F, Xu H. Rapid and simultaneous quantification of viable Escherichia coli O157:H7 and Salmonella spp. in milk through multiplex real-time PCR. J Dairy Sci 2017; 100:8804-8813. [PMID: 28865862 DOI: 10.3168/jds.2017-13362] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 07/17/2017] [Indexed: 11/19/2022]
Abstract
Escherichia coli O157:H7 and Salmonella spp. in milk are 2 common pathogens that cause foodborne diseases. An accurate, rapid, specific method has been developed for the simultaneous detection of viable E. coli O157:H7 and Salmonella spp. in milk. Two specific genes, namely, fliC from E. coli O157:H7 and invA from Salmonella spp., were selected to design primers and probes. A combined treatment containing sodium deoxycholate (SDO) and propidium monoazide (PMA) was applied to detect viable E. coli O157:H7 and Salmonella spp. only. Traditional culture methods and SDO-PMA-multiplex real-time (mRT) PCR assay were applied to determine the number of viable E. coli O157:H7 and Salmonella spp. in cell suspensions with different proportions of dead cells. These methods revealed consistent findings regarding the detected viable cells. The detection limit of the SDO-PMA-mRT-PCR assay reached 102 cfu/mL for Salmonella spp. and 102 cfu/mL for E. coli O157:H7 in milk. The detection limit of SDO-PMA-mRT-PCR for E. coli O157:H7 and Salmonella spp. in milk was significantly similar even in the presence of 106 cfu/mL of 2 nontarget bacteria. The proposed SDO-PMA-mRT-PCR assay is a potential approach for the accurate and sensitive detection of viable E. coli O157:H7 and Salmonella spp. in milk.
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Affiliation(s)
- Baoqing Zhou
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Taobo Liang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Zhongxu Zhan
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Rui Liu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Fan Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China
| | - Hengyi Xu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, PR China.
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10
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Jeong MI, Park SY, Ha SD. Thermal inactivation of human norovirus on spinach using propidium or ethidium monoazide combined with real-time quantitative reverse transcription-polymerase chain reaction. Food Control 2017. [DOI: 10.1016/j.foodcont.2017.02.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Ding T, Suo Y, Zhang Z, Liu D, Ye X, Chen S, Zhao Y. A Multiplex RT-PCR Assay for S. aureus, L. monocytogenes, and Salmonella spp. Detection in Raw Milk with Pre-enrichment. Front Microbiol 2017; 8:989. [PMID: 28620364 PMCID: PMC5449760 DOI: 10.3389/fmicb.2017.00989] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 05/16/2017] [Indexed: 11/13/2022] Open
Abstract
This study firstly developed a multiplex real-time PCR (RT-PCR) technique combined with a pre-enrichment step to simultaneously detect Staphylococcus aureus (S. aureus), Listeria monocytogenes (L. monocytogenes) and Salmonella spp. in raw milk and the dairy farm environment (feces, soil, feed, water) in one reaction. Brain heart infusion (BHI) broth was selected for the enrichment step to increase the density of the target bacteria by using an incubation of 4 h before multiplex RT-PCR. The results showed that the detection limit of the multiplex real-time assay was approximately 102 CFU/mL for pure cultures and artificially contaminated milk without enrichment, while 12, 14, and 10 CFU/25 mL, respectively, for S. aureus, L. monocytogenes, and Salmonella spp. after pre-enrichment. The newly developed multiplex RT-PCR assay was applied to 46 dairy farm environmental samples and raw milk samples covering a wide variety of sample types. The results demonstrated that the multiplex RT-PCR assay coupled with the BHI enrichment broth was suitable for the simultaneous screening of S. aureus, L. monocytogenes, and Salmonella spp. in the pasture environment and in raw milk. The multiplex RT-PCR assay clearly and successfully shortened the total detection time and reduced labor compared to conventional culture-based methods for testing natural samples.
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Affiliation(s)
- Tian Ding
- Department of Food Science and Nutrition, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang UniversityHangzhou, China
| | - Yuanjie Suo
- Department of Food Science and Nutrition, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang UniversityHangzhou, China
| | - Zhaohuan Zhang
- College of Food Science and Technology, Shanghai Ocean UniversityShanghai, China
| | - Donghong Liu
- Department of Food Science and Nutrition, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang UniversityHangzhou, China
| | - Xingqian Ye
- Department of Food Science and Nutrition, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang UniversityHangzhou, China
| | - Shiguo Chen
- Department of Food Science and Nutrition, Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang UniversityHangzhou, China
| | - Yong Zhao
- College of Food Science and Technology, Shanghai Ocean UniversityShanghai, China
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12
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Li F, Xie G, Zhou B, Yu P, Yu S, Aguilar ZP, Wei H, Xu H. Rapid and simultaneous detection of viable Cronobacter sakazakii , Staphylococcus aureus , and Bacillus cereus in infant food products by PMA-mPCR assay with internal amplification control. Lebensm Wiss Technol 2016. [DOI: 10.1016/j.lwt.2016.07.044] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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13
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Kouchakkhani H, Dehghan P, Moosavy MH, Sarmadi B. Occurrence, Molecular Detection and Antibiotic Resistance Profile of Escherichia coli O157:H7 Isolated from Ready-to-Eat Vegetable Salads in Iran. PHARMACEUTICAL SCIENCES 2016. [DOI: 10.15171/ps.2016.31] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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14
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Sato JPH, Takeuti KL, Andrade MR, Koerich PK, Tagliari V, Bernardi ML, Cardoso MR, Barcellos DE. Virulence profiles of enterotoxigenic Escherichia coli isolated from piglets with post-weaning diarrhea and classification according to fecal consistency. PESQUISA VETERINARIA BRASILEIRA 2016. [DOI: 10.1590/s0100-736x2016000400001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract The aim of this study was to assess the frequency and association of virulence factors of Escherichia (E.) coli isolated from weaned piglets with diarrhea and to correlate it with fecal consistency. A total of 152 rectal swabs were collected from 25-40 day-old piglets with diarrhea, in farms of Southern Brazil. Phenotypical and molecular techniques were used for bacterial isolation, characterization and classification of enterotoxigenic E. coli (ETEC) pathotypes. Statistical analysis was carried out to determine the frequency of virulence factors and virotypes, of fimbriae F4, F5, F6, F18, F41 and toxins LT, STa, STb and STx2e. Out of 456 E. coli isolates, 287 (62.9%) samples showed significant growth of E. coli. Among them, 194 (67.6%) samples showed at least one virulence factor, indicating that ETEC is an important etiological agent of diarrhea in weaned piglets. Higher frequencies were found of fimbria F4 and F18 and enterotoxins LT, STa and STb. Significant association was found to F4, LT, STa and STb; between F18 and STa and STx2e; between F5 and LT, STa and STb. The most frequent virotypes were F18-STa, F4-LT-STa-STb, F4-STa, F4-LT-STb and F18-STa-STx2e. Beta-hemolysis was observed in 47.4% of samples and there was significant association between hemolytic samples and virulence factors F4, F18, STa and STx2e. Regarding fecal consistency, there was significant association of liquid feces and F4 fimbria, STa toxin and virotypes F4-STa and F4-F5-LT-STa-STb. Since there was significant association of ETEC and liquid feces in nursery piglets, it is important to prioritize the sampling of liquid feces for the diagnosis etiologic cause of diarrhea.
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15
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Rapid detection of viable Bacillus cereus emetic and enterotoxic strains in food by coupling propidium monoazide and multiplex PCR (PMA-mPCR). Food Control 2015. [DOI: 10.1016/j.foodcont.2015.02.049] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Development, and complete evaluation, of a novel Most-Probable-Number (MPN) qPCR method for accurate and express quantification of Listeria monocytogenes in foodstuffs. Eur Food Res Technol 2015. [DOI: 10.1007/s00217-015-2496-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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17
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Zhang Z, Xiao L, Lou Y, Jin M, Liao C, Malakar PK, Pan Y, Zhao Y. Development of a multiplex real-time PCR method for simultaneous detection of Vibrio parahaemolyticus, Listeria monocytogenes and Salmonella spp. in raw shrimp. Food Control 2015. [DOI: 10.1016/j.foodcont.2014.11.007] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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18
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Liu Z, Zhu J, Xia X, Wang L, Yang C, Li X. Development of a Loop-Mediated Isothermal Amplification Assay Based on lmo0460 Sequence for Detection of L
isteria monocytogenes. J Food Saf 2015. [DOI: 10.1111/jfs.12183] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Zhanmin Liu
- School of Life Sciences; Shanghai University; Shanghai 200444 China
| | - Jiachao Zhu
- School of Life Sciences; Shanghai University; Shanghai 200444 China
| | - Xueying Xia
- School of Life Sciences; Shanghai University; Shanghai 200444 China
| | - Lin Wang
- School of Life Sciences; Shanghai University; Shanghai 200444 China
| | - Cuiyun Yang
- Shanghai Entry-Exit Inspection and Quarantine Bureau; Shanghai China
| | - Xiaohong Li
- Shanghai Entry-Exit Inspection and Quarantine Bureau; Shanghai China
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19
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Ma K, Deng Y, Bai Y, Xu D, Chen E, Wu H, Li B, Gao L. Rapid and simultaneous detection of Salmonella, Shigella, and Staphylococcus aureus in fresh pork using a multiplex real-time PCR assay based on immunomagnetic separation. Food Control 2014. [DOI: 10.1016/j.foodcont.2014.01.042] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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A fast, reliable, and sensitive method for detection and quantification of Listeria monocytogenes and Escherichia coli O157:H7 in ready-to-eat fresh-cut products by MPN-qPCR. BIOMED RESEARCH INTERNATIONAL 2014; 2014:608296. [PMID: 24949460 PMCID: PMC4052075 DOI: 10.1155/2014/608296] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 04/29/2014] [Accepted: 04/30/2014] [Indexed: 12/03/2022]
Abstract
In the present work we developed a MPN quantitative real-time PCR (MPN-qPCR) method for a fast and reliable detection and quantification of Listeria monocytogenes and Escherichia coli O157:H7 in minimally processed vegetables. In order to validate the proposed technique, the results were compared with conventional MPN followed by phenotypic and biochemical assays methods. When L. monocytogenes and E. coli O157:H7 were artificially inoculated in fresh-cut vegetables, a concentration as low as 1 CFU g−1 could be detected in 48 hours for both pathogens. qPCR alone allowed a limit of detection of 101 CFU g−1 after 2 hours of enrichment for L. monocytogenes and E. coli O157:H7. Since minimally processed ready-to-eat vegetables are characterized by very short shelf life, our method can potentially address the consistent reduction of time for microbial analysis, allowing a better management of quality control. Moreover, the occurrences of both pathogenic bacteria in mixed salad samples and fresh-cut melons were monitored in two production plants from the receipt of the raw materials to the early stages of shelf life. No sample was found to be contaminated by L. monocytogenes. One sample of raw mixed salad was found positive to an H7 enterohemorrhagic serotype.
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21
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Wang L, Li P, Zhang Z, Chen Q, Aguilar ZP, Xu H, Yang L, Xu F, Lai W, Xiong Y, Wei H. Rapid and accurate detection of viable Escherichia coli O157:H7 in milk using a combined IMS, sodium deoxycholate, PMA and real-time quantitative PCR process. Food Control 2014. [DOI: 10.1016/j.foodcont.2013.08.011] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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22
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Evaluation of Zataria multiflora Boiss. essential oil activity against Escherichia coli O157:H7, Salmonella enterica and Listeria monocytogenes by propidium monoazide quantitative PCR in vegetables. Food Control 2013. [DOI: 10.1016/j.foodcont.2013.06.036] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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23
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Feng M, Yong Q, Wang W, Kuang H, Wang L, Xu C. Development of a monoclonal antibody-based ELISA to detectEscherichia coliO157:H7. FOOD AGR IMMUNOL 2013. [DOI: 10.1080/09540105.2012.716026] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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24
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Pires AF, Funk JA, Lim A, Bolin SR. Enumeration ofSalmonellain Feces of Naturally Infected Pigs. Foodborne Pathog Dis 2013; 10:933-7. [DOI: 10.1089/fpd.2013.1547] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Alda F.A. Pires
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan
| | - Julie A. Funk
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan
| | - Ailam Lim
- Diagnostic Center for Population and Animal Health, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan
| | - Steven R. Bolin
- Diagnostic Center for Population and Animal Health, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan
- Department of Pathobiology and Diagnostic Investigation, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan
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25
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Elizaquível P, Aznar R, Sánchez G. Recent developments in the use of viability dyes and quantitative PCR in the food microbiology field. J Appl Microbiol 2013; 116:1-13. [DOI: 10.1111/jam.12365] [Citation(s) in RCA: 117] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 10/08/2013] [Accepted: 10/08/2013] [Indexed: 01/09/2023]
Affiliation(s)
- P. Elizaquível
- Department of Microbiology and Ecology; University of Valencia; Valencia Spain
| | - R. Aznar
- Department of Microbiology and Ecology; University of Valencia; Valencia Spain
- Institute of Agrochemistry and Food Technology (IATA); Spanish Council for Scientific Research (CSIC); Valencia Spain
| | - G. Sánchez
- Institute of Agrochemistry and Food Technology (IATA); Spanish Council for Scientific Research (CSIC); Valencia Spain
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26
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Garrido A, Chapela MJ, Román B, Fajardo P, Vieites JM, Cabado AG. In-house validation of a multiplex real-time PCR method for simultaneous detection of Salmonella spp., Escherichia coli O157 and Listeria monocytogenes. Int J Food Microbiol 2013; 164:92-8. [PMID: 23624537 DOI: 10.1016/j.ijfoodmicro.2013.03.024] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 02/24/2013] [Accepted: 03/26/2013] [Indexed: 10/27/2022]
Abstract
A wide variety of qPCR methods currently exist for Salmonella spp., Escherichia coli O157 and Listeria monocytogenes detection. These methods target several genes and use different detection chemistries, either in simplex or in multiplex formats. However, the majority of these methods have not been carefully validated, and the number of validated methods that use multiplex qPCR is even lower. The aim of the present study was to develop and validate a multiplex qPCR method from previously validated simplex qPCR primers and probes. A modified broth medium was selected and primary and secondary enrichment times were further optimized. Efficiency of the newly combined qPCR system was comprised between 91% and 108%, for simplex and multiplex analyses. A total of 152 food and environmental, natural and spiked samples, were analyzed for the evaluation of the method obtaining values above 91% that were reached for all the quality parameters analyzed. A very low limit of detection (5 cfu/25 g after enrichment) for simultaneous identification of these 3 pathogens was obtained.
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Affiliation(s)
- Alejandro Garrido
- Microbiology and Toxins Area, ANFACO-CECOPESCA, Campus Univ. 16, 36310 Vigo PO, Spain
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27
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A new multiplex real-time PCR developed method for Salmonella spp. and Listeria monocytogenes detection in food and environmental samples. Food Control 2013. [DOI: 10.1016/j.foodcont.2012.06.029] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Martínez-Abad A, Ocio MJ, Lagarón JM, Sánchez G. Evaluation of silver-infused polylactide films for inactivation of Salmonella and feline calicivirus in vitro and on fresh-cut vegetables. Int J Food Microbiol 2013; 162:89-94. [PMID: 23376782 DOI: 10.1016/j.ijfoodmicro.2012.12.024] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Revised: 12/18/2012] [Accepted: 12/23/2012] [Indexed: 12/01/2022]
Abstract
There is a growing trend to develop packaging materials with an active role in guarantying that the quality and safety characteristics of packaged products will remain or improve from preparation throughout shelf-life. In the present study, 0.001-1.0 wt.% silver ions were satisfactorily incorporated into polylactide (PLA) films by a solvent casting technique. Silver migration from the films was measured by voltamperometry and then correlated with its antimicrobial efficacy against Salmonella enterica and feline calicivirus (FCV), a human norovirus surrogate, by using the Japanese industrial standard (JIS Z 2801). The PLA-silver films showed strong antibacterial and antiviral activity in vitro, with increasing effects at higher silver concentrations. Moreover, results show that FCV was less susceptible to silver than Salmonella. When films were applied on food samples, antibacterial and antiviral activity was reduced as compared to in vitro. Antimicrobial activity was very much dependent on the food type and temperature. In lettuce samples incubated at 4 °C during 6 days, 4 log CFU of Salmonella was inactivated for films with 1.0 wt.% and no infectious FCV was reported under the same conditions. On paprika samples, no antiviral effect was seen on FCV infectivity whereas films showed less antibacterial activity on Salmonella.
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Affiliation(s)
- A Martínez-Abad
- Novel Materials and Nanotechnology Group, IATA, CSIC, Av. Catedrático Agustin Escardino 7, 46980 Paterna, Valencia, Spain
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29
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Elizaquível P, Sánchez G, Aznar R. Application of propidium monoazide quantitative PCR for selective detection of live Escherichia coli O157:H7 in vegetables after inactivation by essential oils. Int J Food Microbiol 2012; 159:115-21. [PMID: 23072696 DOI: 10.1016/j.ijfoodmicro.2012.08.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Revised: 07/18/2012] [Accepted: 08/06/2012] [Indexed: 11/16/2022]
Abstract
The use of propidium monoazide (PMA) is enjoying increased popularity among researchers in different fields of microbiology. Its use in combination with real-time PCR (qPCR) represents one of the most successful approaches to detect viable cells. PMA-qPCR has successfully been used to evaluate the efficacy of various disinfection technologies in different microorganisms. Initially, in this study the effect of four essential oils (EOs), cumin, clove, oregano and cinnamon, was evaluated on suspensions of the enterohemorrhagic Escherichia coli O157:H7 by PMA-qPCR, LIVE/DEAD BacLight flow cytometry analysis (LIVE/DEAD-FCM), and plate count. E. coli O157:H7 cells treated with EOs at killing concentrations were permeable to PMA which was confirmed by LIVE/DEAD-FCM. However, the PMA-qPCR assay allows specific quantification among the autochthonous microbiota of food products. Therefore, the PMA-qPCR assay was used to evaluate its applicability in artificially contaminated iceberg lettuce and soya sprouts. Amplification signal was negative for the spiking tests performed with any of the EO-killed E. coli cells. It demonstrates that the PMA-qPCR assay is a suitable technique for monitoring E. coli O157:H7 inactivation by essential oils in fresh-cut vegetables.
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Affiliation(s)
- Patricia Elizaquível
- Departamento de Microbiología y Ecología, Universitat de València, Av. Dr. Moliner, 50, 46100 Burjassot, Valencia, Spain
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30
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Elizaquível P, Sánchez G, Aznar R. Quantitative detection of viable foodborne E. coli O157:H7, Listeria monocytogenes and Salmonella in fresh-cut vegetables combining propidium monoazide and real-time PCR. Food Control 2012. [DOI: 10.1016/j.foodcont.2011.12.003] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Elizaquível P, Sánchez G, Selma M, Aznar R. Application of propidium monoazide-qPCR to evaluate the ultrasonic inactivation of Escherichia coli O157:H7 in fresh-cut vegetable wash water. Food Microbiol 2012; 30:316-20. [DOI: 10.1016/j.fm.2011.10.008] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Revised: 09/23/2011] [Accepted: 10/05/2011] [Indexed: 10/16/2022]
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32
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Development of a multiplex real-time PCR method for simultaneous detection of Salmonella enterica, Shigella flexneri and Listeria monocytogenes in processed food samples. Eur Food Res Technol 2012. [DOI: 10.1007/s00217-012-1665-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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33
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A single method for recovery and concentration of enteric viruses and bacteria from fresh-cut vegetables. Int J Food Microbiol 2012; 152:9-13. [DOI: 10.1016/j.ijfoodmicro.2011.10.002] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 09/26/2011] [Accepted: 10/02/2011] [Indexed: 11/15/2022]
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34
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Gubala V, Harris LF, Ricco AJ, Tan MX, Williams DE. Point of Care Diagnostics: Status and Future. Anal Chem 2011; 84:487-515. [DOI: 10.1021/ac2030199] [Citation(s) in RCA: 832] [Impact Index Per Article: 64.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Vladimir Gubala
- Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland
| | - Leanne F. Harris
- Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland
| | - Antonio J. Ricco
- Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland
| | - Ming X. Tan
- Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland
| | - David E. Williams
- Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland
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