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Chon JW, Jung JY, Ahn Y, Bae D, Khan S, Seo KH, Kim H, Sung K. Detection of Campylobacter jejuni from Fresh Produce: Comparison of Culture- and PCR-based Techniques, and Metagenomic Approach for Analyses of the Microbiome before and after Enrichment. J Food Prot 2021; 84:1704-1712. [PMID: 33878155 DOI: 10.4315/jfp-20-408] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 04/14/2021] [Indexed: 11/11/2022]
Abstract
ABSTRACT In this study, we compared the efficiency of culture-based methods with or without membrane filtration, real-time PCR, and digital droplet PCR (ddPCR) for the detection of Campylobacter in fresh produce. Alfalfa sprouts, clover sprouts, coleslaw, and lettuce salad spiked with Campylobacter jejuni were enriched in Bolton broth for 48 h, and enrichment cultures were either directly inoculated onto modified charcoal-cefoperazone-deoxycholate agar or applied on membrane filters placed on the surface of plating media. In parallel, 2-mL Bolton broth cultures were taken to extract DNA for real-time PCR and ddPCR assays and bacterial community analysis. A developed primer set for ddPCR and real-time PCR was evaluated for its inclusivity and exclusivity using pure culture of C. jejuni and non-C. jejuni strains, respectively. In pure culture, the primer set reacted only with C. jejuni strains and showed negative reaction to non-C. jejuni strains. There was no significant difference (P > 0.05) in the detection efficiency of positive Campylobacter isolates from coleslaw and lettuce salad using four detection methods. However, for sprout samples, the detection efficiency of the culture method was significantly (P < 0.05) lower than those of the two PCR assays and the filtration method. The analysis also revealed the presence of Pseudomonas and Acinetobacter as the most prevalent competing microbiota in enriched culture and only Acinetobacter on agar plates in the selective culture step. HIGHLIGHTS
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Affiliation(s)
- Jung-Whan Chon
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas 72079, USA
| | - Ji Young Jung
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas 72079, USA
| | - Youngbeom Ahn
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas 72079, USA
| | - Dongryeoul Bae
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas 72079, USA
| | - Saeed Khan
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas 72079, USA
| | - Kun-Ho Seo
- Center for One Health, College of Veterinary Medicine, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Hyunsook Kim
- Department of Food & Nutrition, College of Human Ecology, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Kidon Sung
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas 72079, USA
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Identification of pathogenic genes in Campylobacter jejuni isolated from broiler carcasses and broiler slaughterhouses. Sci Rep 2021; 11:4588. [PMID: 33633256 PMCID: PMC7907142 DOI: 10.1038/s41598-021-84149-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 02/08/2021] [Indexed: 02/08/2023] Open
Abstract
Campylobacter jejuni is one of the most common causes of foodborne diseases worldwide. There are few reports on Campylobacter strains isolated from Latin-American countries. Here, 140 C. jejuni strains isolated from cloacal and transport boxes swabs, water from chiller tanks, and broiler carcasses of five poultry companies in Southern Brazil were identified using phenotypic and genotypic methods. Polymerase chain reaction (PCR) was used to analyze eight C. jejuni virulence markers: flaA, cadF, and invasion-associated (iam) genes, cdtABC operon (associated with the cytolethal distending toxin), and plasmidial virB11 and wlaN genes were present in 78.5%, 77.8%, 0%, 74.2%, 22.1%, and 10.7% of samples, respectively. There were 25 different virulence profiles: 1 (cdtA, cdtB, cdtC, flaA, and cadF), 2 (cdtA, cdtB, cdtC, flaA, cadF, and virB11), and 3 (cdtA, cdtB, cdtC, flaA, cadF, and wlaN) were the most common (> 60% of strains). We provide insight into factors related to the occurrence of this pathogen and their epidemiology.
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Jang YO, Noh GS, Liu H, Koo B, Qiao Z, Shin Y. Dimethyl 3,3'-dithiobispropionimidate-functionalized diatomaceous earth particles for efficient biomolecule separation. Sci Rep 2020; 10:15592. [PMID: 32973156 PMCID: PMC7519118 DOI: 10.1038/s41598-020-72913-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 09/01/2020] [Indexed: 11/09/2022] Open
Abstract
The early diagnosis and monitoring of cancers are key factors in effective cancer treatment. Particularly, the separation of biomolecules is an essential step for both diagnostic and analytical purposes. However, the current techniques used to isolate biomolecules are intensive, laborious, and require multiple instruments as well as repeated sample preparations to separate each biomolecule. Thus, an efficient separation system that can simultaneously separate biomolecules from scarce samples is highly desirable. Hence, in this study, we developed a biosilica-based syringe filtration system for the efficient separation of biomolecules from cancer samples using amine-modified diatomaceous earth (AD) with dimethyl 3,3′-dithiobispropionimidate (DTBP). The syringe filter can be an efficient and rapid tool for use in various procedures without complex instruments. The DTBP-based AD system was combined with the syringe filter system for nucleic acid and protein separation from various cancer cells. We demonstrated the efficacy of the DTBP-based AD in a single-filter system for the efficient separation of DNA and proteins within 40 min. This DTBP-based AD syringe filter system showed good rapidity, efficiency, and affordability in the separation of biomolecules from single samples for the early diagnosis and clinical analysis of cancers.
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Affiliation(s)
- Yoon Ok Jang
- Department of Convergence Medicine, Asan Medical Institute of Convergence Science and Technology (AMIST), University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Institute of Life Sciences, Asan Medical Center, 05505, Seoul, Republic of Korea
| | - Geun Su Noh
- Department of Convergence Medicine, Asan Medical Institute of Convergence Science and Technology (AMIST), University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Institute of Life Sciences, Asan Medical Center, 05505, Seoul, Republic of Korea
| | - Huifang Liu
- Department of Convergence Medicine, Asan Medical Institute of Convergence Science and Technology (AMIST), University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Institute of Life Sciences, Asan Medical Center, 05505, Seoul, Republic of Korea
| | - Bonhan Koo
- Department of Convergence Medicine, Asan Medical Institute of Convergence Science and Technology (AMIST), University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Institute of Life Sciences, Asan Medical Center, 05505, Seoul, Republic of Korea
| | - Zhen Qiao
- Department of Convergence Medicine, Asan Medical Institute of Convergence Science and Technology (AMIST), University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Institute of Life Sciences, Asan Medical Center, 05505, Seoul, Republic of Korea
| | - Yong Shin
- Department of Convergence Medicine, Asan Medical Institute of Convergence Science and Technology (AMIST), University of Ulsan College of Medicine, Biomedical Engineering Research Center, Asan Institute of Life Sciences, Asan Medical Center, 05505, Seoul, Republic of Korea.
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Chon JW, Kim DH, Bae D, Song KY, Kim H, Sung K, Seo KH. Comparison of Direct Syringe Filtration and Membrane Filtration for the Selective Isolation of Campylobacter jejuni from Ready-to-Eat Sprouts. Foodborne Pathog Dis 2019; 16:371-375. [PMID: 30864872 DOI: 10.1089/fpd.2018.2546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Culture method using enrichment broth and selective agar is one of the most common isolation methods for detecting Campylobacter jejuni from food. However, the overgrowth of competing bacteria in enrichment culture complicates the selective isolation of C. jejuni. In this study, we compared an enrichment/plating method for the isolation of C. jejuni from sprout samples with an enrichment/plating method with syringe or membrane filtration when transferring enriched broths to plates. Four types of sprout samples were artificially contaminated with various levels of C. jejuni and incubated in 100 mL of Bolton broth for 48 h. Enrichment broths were either directly transferred onto modified charcoal-cefoperazone-deoxycholate agar or filtered through membrane or with a syringe. A significantly higher (p < 0.05) isolation rate of Campylobacter positives was obtained with both filtration methods (58-61%) than with the method without filtration (10%). Membrane filtrations yielded 61%, whereas syringe yielded 58% positives. In most cases of unfiltered samples (98%), high competing flora covered most of the plate, making differentiation and picking of suspicious colonies difficult. However, less plates were contaminated with competing flora in both filtration methods. Only 5% of plates were contaminated in the syringe filtration method, whereas no competing flora was observed in membrane filtration (0%).
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Affiliation(s)
- Jung-Whan Chon
- 1 Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul, Korea
| | - Dong-Hyeon Kim
- 1 Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul, Korea
| | - Dongryeoul Bae
- 2 Arkansas Regional Laboratory, Office of Regulatory, U.S. Food and Drug Administration, Jefferson, Arkansas
| | - Kwang-Young Song
- 1 Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul, Korea
| | - Hyunsook Kim
- 3 Department of Food and Nutrition, College of Human Ecology, Hanyang University, Seoul, Korea
| | - Kidon Sung
- 4 Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas
| | - Kun-Ho Seo
- 1 Center for One Health, College of Veterinary Medicine, Konkuk University, Seoul, Korea
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Use of syringe filters to isolate Campylobacter species from stool samples. J Microbiol Methods 2018; 155:78-81. [DOI: 10.1016/j.mimet.2018.11.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 11/14/2018] [Accepted: 11/14/2018] [Indexed: 12/24/2022]
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