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Diouani MF, Sayhi M, Djafar ZR, Ben Jomaa S, Belgacem K, Gharbi H, Ghita M, Popescu LM, Piticescu R, Laouini D. Magnetic Separation and Centri-Chronoamperometric Detection of Foodborne Bacteria Using Antibiotic-Coated Metallic Nanoparticles. BIOSENSORS-BASEL 2021; 11:bios11070205. [PMID: 34201531 PMCID: PMC8301846 DOI: 10.3390/bios11070205] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 06/10/2021] [Accepted: 06/15/2021] [Indexed: 11/25/2022]
Abstract
Quality and food safety represent a major stake and growing societal challenge in the world. Bacterial contamination of food and water resources is an element that pushes scientists to develop new means for the rapid and efficient detection and identification of these pathogens. Conventional detection tools are often bulky, laborious, expensive to buy, and, above all, require an analysis time of a few hours to several days. The interest in developing new, simple, rapid, and nonlaborious bacteriological diagnostic methods is therefore increasingly important for scientists, industry, and regulatory bodies. In this study, antibiotic-functionalized metallic nanoparticles were used to isolate and identify the foodborne bacterial strains Bacillus cereus and Shigella flexneri. With this aim, a new diagnostic tool for the rapid detection of foodborne pathogenic bacteria, gold nanoparticle-based centri-chronoamperometry, has been developed. Vancomycin was first stabilized at the surface of gold nanoparticles and then incubated with the bacteria B. cereus or S. flexneri to form the AuNP@vancomycin/bacteria complex. This complex was separated by centrifugation, then treated with hydrochloric acid and placed at the surface of a carbon microelectrode. The gold nanoparticles of the formed complex catalyzed the hydrogen reduction reaction, and the generated current was used as an analytical signal. Our results show the possibility of the simple and rapid detection of the S. flexneri and B. cereus strains at very low numbers of 3 cells/mL and 12 cells/mL, respectively. On the other hand, vancomycin-capped magnetic beads were easily synthesized and then used to separate the bacteria from the culture medium. The results show that vancomycin at the surface of these metallic nanoparticles is able to interact with the bacteria membrane and then used to separate the bacteria and to purify an inoculated medium.
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Affiliation(s)
- Mohamed Fethi Diouani
- Laboratory of Epidemiology and Veterinary Microbiology (LEMV), Institut Pasteur de Tunis, LR11IPT03, Tunis-Belvédère 1002, Tunisia
- Campus Universitaire Farhat Hached B.P. n° 94-ROMMANA, Université Tunis El Manar, Tunis 1068, Tunisia
| | - Maher Sayhi
- Laboratory of Epidemiology and Veterinary Microbiology (LEMV), Institut Pasteur de Tunis, LR11IPT03, Tunis-Belvédère 1002, Tunisia
- Campus Universitaire Farhat Hached B.P. n° 94-ROMMANA, Université Tunis El Manar, Tunis 1068, Tunisia
- Faculté des Sciences de Tunis, Campus Universitaire, El Manar, Tunis 2092, Tunisia
- Laboratory of Transmission, Control and Immunobiology of Infections (LTCII), Institut Pasteur de Tunis, LR11IPT02, Tunis-Belvédère 1002, Tunisia
| | - Zehaira Romeissa Djafar
- Laboratory of Improvement and Development of Plant and Animal Production (ADPVA), Sétif 19000, Algeria
- Faculty of Sciences, University of Sétif, Sétif 19000, Algeria
| | - Samir Ben Jomaa
- Laboratory of Epidemiology and Veterinary Microbiology (LEMV), Institut Pasteur de Tunis, LR11IPT03, Tunis-Belvédère 1002, Tunisia
- Faculté des Sciences de Bizerte, Université de Carthage, Bizerte 1054, Tunisia
| | - Kamel Belgacem
- Laboratory of Epidemiology and Veterinary Microbiology (LEMV), Institut Pasteur de Tunis, LR11IPT03, Tunis-Belvédère 1002, Tunisia
| | - Hayet Gharbi
- Laboratory of Epidemiology and Veterinary Microbiology (LEMV), Institut Pasteur de Tunis, LR11IPT03, Tunis-Belvédère 1002, Tunisia
| | - Mihai Ghita
- National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei Blvd, Pantelimon, 077145 Ilfov, Romania
| | - Laura-Madalina Popescu
- National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei Blvd, Pantelimon, 077145 Ilfov, Romania
| | - Roxana Piticescu
- National R&D Institute for Non-Ferrous and Rare Metals, INCDMNR-IMNR, 102 Biruintei Blvd, Pantelimon, 077145 Ilfov, Romania
| | - Dhafer Laouini
- Faculté des Sciences de Tunis, Campus Universitaire, El Manar, Tunis 2092, Tunisia
- Laboratory of Transmission, Control and Immunobiology of Infections (LTCII), Institut Pasteur de Tunis, LR11IPT02, Tunis-Belvédère 1002, Tunisia
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Gopinath KP, Madhav NV, Krishnan A, Malolan R, Rangarajan G. Present applications of titanium dioxide for the photocatalytic removal of pollutants from water: A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 270:110906. [PMID: 32721341 DOI: 10.1016/j.jenvman.2020.110906] [Citation(s) in RCA: 112] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 04/26/2020] [Accepted: 06/01/2020] [Indexed: 05/20/2023]
Abstract
The evolution of modern technology and industrial processes has been accompanied by an increase in the utilization of chemicals to derive new products. Water bodies are frequently contaminated by the presence of conventional pollutants such as dyes and heavy metals, as well as microorganisms that are responsible for various diseases. A sharp rise has also been observed in the presence of new compounds heretofore excluded from the design and evaluation of wastewater treatment processes, categorized as "emerging pollutants". While some are harmless, certain emerging pollutants possess the ability to cause debilitating effects on a wide spectrum of living organisms. Photocatalytic degradation has emerged as an increasingly popular solution to the problem of water pollution due to its effectiveness and versatility. The primary objective of this study is to thoroughly scrutinize recent applications of titanium dioxide and its modified forms as photocatalytic materials in the removal and control of several classes of water pollutants as reported in literature. Different structural modifications are used to enhance the performance of the photocatalyst such as doping and formation of composites. The principles of these modifications have been scrutinized and evaluated in this review in order to present their advantages and drawbacks. The mechanisms involved in the removal of different pollutants through photocatalysis performed by TiO2 have been highlighted. The factors affecting the mechanism of photocatalysis and those affecting the performance of different TiO2-based photocatalysts have also been thoroughly discussed, thereby presenting a comprehensive view of all aspects involved in the application of TiO2 to remediate and control water pollution.
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Affiliation(s)
| | - Nagarajan Vikas Madhav
- Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Chennai, 603110, Tamil Nadu, India
| | - Abhishek Krishnan
- Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Chennai, 603110, Tamil Nadu, India
| | - Rajagopal Malolan
- Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Chennai, 603110, Tamil Nadu, India
| | - Goutham Rangarajan
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Ontario, M5S 3E5, Canada
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Complete Genome Sequence of Salmonella enterica Serovar Enteritidis Siphophage Seafire. Microbiol Resour Announc 2019; 8:8/43/e01167-19. [PMID: 31649087 PMCID: PMC6813399 DOI: 10.1128/mra.01167-19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Bacteriophages infecting Salmonella enterica subsp. enterica serovar Enteritidis may be used as biocontrol agents in food products or animals for preventing foodborne diseases caused by this pathogen. The complete genome sequence of phage Seafire, a T5-like siphophage infecting S. Enteritidis, is described in this report. Bacteriophages infecting Salmonella enterica subsp. enterica serovar Enteritidis may be used as biocontrol agents in food products or animals for preventing foodborne diseases caused by this pathogen. The complete genome sequence of phage Seafire, a T5-like siphophage infecting S. Enteritidis, is described in this report.
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Azmuda N, Fakruddin M, Khan SI, Birkeland NK. Bacterial Community Profiling of Tropical Freshwaters in Bangladesh. Front Public Health 2019; 7:115. [PMID: 31214556 PMCID: PMC6554655 DOI: 10.3389/fpubh.2019.00115] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 04/24/2019] [Indexed: 01/25/2023] Open
Abstract
Seasonal and spatial variations in the bacterial communities of two tropical freshwater sources in Bangladesh, Lake Dhanmondi in central Dhaka, and a pond in the outskirts of Dhaka, were assessed and compared using PCR-DGGE and deep sequencing of 16S rRNA genes, as well as heterotrophic enrichments using water samples collected at nine different time points during 1 year. Temporal and spatial variations of common aquatic bacterial genera were observed, but no clear seasonal variations could be depicted. The major bacterial genera identified from these two sites were members of the Proteobacteria, Cyanobacteria, Actinobacteria, Bacteroidetes, Chlorobi, Chloroflexi, Verrucomicrobia, and Firmicutes. Among the proteobacterial groups, members of the α-, β-, and γ- Proteobacteria predominated. γ- Proteobacteria belonging to the Escherichia coli/Shigella group even the diarrheagenic pathotypes of E. coli e.g., EPEC and ETEC were detected in most samples throughout the year, with no apparent correlations with other microbial groups. The other pathotypes, EHEC, EAEC, and EIEC/Shigella spp. were also detected occasionally. This study represents the first thorough analysis of the microbial diversity of tropical freshwater systems in Bangladesh.
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Affiliation(s)
- Nafisa Azmuda
- Department of Microbiology, University of Dhaka, Dhaka, Bangladesh.,Department of Biological Sciences, University of Bergen, Bergen, Norway.,Department of Microbiology, Jahangirnagar University, Savar, Dhaka, Bangladesh
| | - Md Fakruddin
- Department of Microbiology, University of Dhaka, Dhaka, Bangladesh
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Mahdavi S, Azizi Dehbokri M, hajazimian S, Isazadeh A. Contamination of Chicken Meat With Salmonella spp Distributed in Mahabad City, Iran. INTERNATIONAL JOURNAL OF ENTERIC PATHOGENS 2018. [DOI: 10.15171/ijep.2018.18] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Lesaulnier CC, Herbold CW, Pelikan C, Berry D, Gérard C, Le Coz X, Gagnot S, Niggemann J, Dittmar T, Singer GA, Loy A. Bottled aqua incognita: microbiota assembly and dissolved organic matter diversity in natural mineral waters. MICROBIOME 2017; 5:126. [PMID: 28938908 PMCID: PMC5610417 DOI: 10.1186/s40168-017-0344-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Accepted: 09/15/2017] [Indexed: 05/25/2023]
Abstract
BACKGROUND Non-carbonated natural mineral waters contain microorganisms that regularly grow after bottling despite low concentrations of dissolved organic matter (DOM). Yet, the compositions of bottled water microbiota and organic substrates that fuel microbial activity, and how both change after bottling, are still largely unknown. RESULTS We performed a multifaceted analysis of microbiota and DOM diversity in 12 natural mineral waters from six European countries. 16S rRNA gene-based analyses showed that less than 10 species-level operational taxonomic units (OTUs) dominated the bacterial communities in the water phase and associated with the bottle wall after a short phase of post-bottling growth. Members of the betaproteobacterial genera Curvibacter, Aquabacterium, and Polaromonas (Comamonadaceae) grew in most waters and represent ubiquitous, mesophilic, heterotrophic aerobes in bottled waters. Ultrahigh-resolution mass spectrometry of DOM in bottled waters and their corresponding source waters identified thousands of molecular formulae characteristic of mostly refractory, soil-derived DOM. CONCLUSIONS The bottle environment, including source water physicochemistry, selected for growth of a similar low-diversity microbiota across various bottled waters. Relative abundance changes of hundreds of multi-carbon molecules were related to growth of less than ten abundant OTUs. We thus speculate that individual bacteria cope with oligotrophic conditions by simultaneously consuming diverse DOM molecules.
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Affiliation(s)
- Celine C Lesaulnier
- Department of Microbiology and Ecosystem Science, Division of Microbial Ecology, Research Network Chemistry meets Microbiology, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria
| | - Craig W Herbold
- Department of Microbiology and Ecosystem Science, Division of Microbial Ecology, Research Network Chemistry meets Microbiology, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria
| | - Claus Pelikan
- Department of Microbiology and Ecosystem Science, Division of Microbial Ecology, Research Network Chemistry meets Microbiology, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria
| | - David Berry
- Department of Microbiology and Ecosystem Science, Division of Microbial Ecology, Research Network Chemistry meets Microbiology, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria
| | - Cédric Gérard
- Nestec Ltd., Route du Jorat 57, CH-1000, Lausanne 26, Switzerland
| | - Xavier Le Coz
- Nestec Ltd., Route du Jorat 57, CH-1000, Lausanne 26, Switzerland
| | - Sophie Gagnot
- Nestec Ltd., Route du Jorat 57, CH-1000, Lausanne 26, Switzerland
| | - Jutta Niggemann
- University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment, ICBM-MPI Bridging Group for Marine Geochemistry, Carl-von-Ossietzky-Straße 9-11, D-26129, Oldenburg, Germany
| | - Thorsten Dittmar
- University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment, ICBM-MPI Bridging Group for Marine Geochemistry, Carl-von-Ossietzky-Straße 9-11, D-26129, Oldenburg, Germany
| | - Gabriel A Singer
- Department of Ecohydrology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, D-12587, Berlin, Germany
| | - Alexander Loy
- Department of Microbiology and Ecosystem Science, Division of Microbial Ecology, Research Network Chemistry meets Microbiology, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria.
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Soltan Dallal MM, Sharifi Yazdi MK, Mirzaei N, Kalantar E. Prevalence of Salmonella spp. in Packed and Unpacked Red Meat and Chicken in South of Tehran. Jundishapur J Microbiol 2014; 7:e9254. [PMID: 25147699 PMCID: PMC4138620 DOI: 10.5812/jjm.9254] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 05/05/2013] [Accepted: 06/25/2013] [Indexed: 11/16/2022] Open
Abstract
Background: Despite of the advances in infectious diseases prevention and food technology, food-borne diseases are considered major problems in developed and developing countries. Meat plays a key role in transferring zoonotic diseases to human. Objectives: This study was conducted in south of Tehran, Iran, to investigate the prevalence rate of Salmonella spp. in packed and unpacked red meat and chicken. Materials and Methods: A total of 379 packed and unpacked samples including 189 red meat and 190 chicken samples were collected randomly. From each sample, 25 g was separated and treated with 225 mL of buffered peptone water, homogenized and incubated at 37°C for 24 hours. Samples were enriched using Rappaport-Vassiliadis broth and then streaked onto Hektoen enteric agar. Results: Totally, 86 out of 190 chicken and 38 out of 189 red meat samples were contaminated with Salmonella spp. The most isolated serotypes were Salmonella thompson (67.7%), S. heaardt (6.5%), S. enteritidis (4.8%), and S. veyle (4%), respectively. In general, the rate of chicken contamination was higher than meat, as 43.3% of packed and 46% of unpacked chicken samples were contaminated. Conclusions: These results confirmed the pervious findings, stating that proper packaging of meat products can effectively decreases the rate of microbial contaminations.
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Affiliation(s)
- Mohammad Mehdi Soltan Dallal
- Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, IR Iran
- Division of Microbiology, Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, IR Iran
- Corresponding author: Mohammad Mehdi Soltan Dallal, Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, IR Iran. Tel: + 98-2166462268, Fax: + 98-2166462267, E-mail:
| | - Mohammad kazem Sharifi Yazdi
- Zoonosis Research Centre, Tehran University of Medical Sciences, Tehran, IR Iran
- Department of Medical Laboratory Sciences, School of Paramedicine, Tehran University of Medical Sciences, Tehran, IR Iran
| | - Nima Mirzaei
- Department of Microbiology, Science and Research Branch, Islamic Azad University, Tehran, IR Iran
| | - Enayat Kalantar
- Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, IR Iran
- Department of Microbiology, Faculty of Medicine, Alborz University of Medical Sciences, Karaj, IR Iran
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Salmonella enterica serovar Enteritidis tatB and tatC mutants are impaired in Caco-2 cell invasion in vitro and show reduced systemic spread in chickens. Infect Immun 2010; 78:3493-505. [PMID: 20498258 DOI: 10.1128/iai.00090-10] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Salmonella enterica subsp. enterica serovar Enteritidis is a leading causative agent of gastroenteritis in humans. This pathogen also colonizes the intestinal tracts of poultry and can spread systemically in chickens. Transfer to humans usually occurs through undercooked or improperly handled poultry meat or eggs. The bacterial twin-arginine transport (Tat) pathway is responsible for the translocation of folded proteins across the cytoplasmic membrane. In order to study the role of the Tat system in the infection and colonization of chickens by Salmonella Enteritidis, we constructed chromosomal deletion mutants of the tatB and tatC genes, which are essential components of the Tat translocon. We observed that the tat mutations affected bacterial cell morphology, motility, and sensitivity to albomycin, sodium dodecyl sulfate (SDS), and EDTA. In addition, the mutant strains showed reduced invasion of polarized Caco-2 cells. The wild-type phenotype was restored in all our Salmonella Enteritidis tat mutants by introducing episomal copies of the tatABC genes. When tested in chickens by use of a Salmonella Enteritidis Delta tatB strain, the Tat system inactivation did not substantially affect cecal colonization, but it delayed systemic infection. Taken together, our data demonstrated that the Tat system plays a role in Salmonella Enteritidis pathogenesis.
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DI PINTO ANGELA, CICCARESE GIUSEPPINA, FONTANAROSA MARIA, TERIO VALENTINA, TANTILLO GIUSEPPINA. DETECTION OF VIBRIO ALGINOLYTICUS AND VIBRIO PARAHAEMOLYTICUS IN SHELLFISH SAMPLES USING COLLAGENASE-TARGETED MULTIPLEX-PCR. J Food Saf 2006. [DOI: 10.1111/j.1745-4565.2006.00039.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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