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Labchip-based diagnosis system for on-site application: Sensitive and easy-to-implement detection of single recoverable Cronobacter in infant formula without post-enrichment treatment. Int J Food Microbiol 2020; 327:108659. [PMID: 32413591 DOI: 10.1016/j.ijfoodmicro.2020.108659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 05/06/2020] [Accepted: 05/07/2020] [Indexed: 11/20/2022]
Abstract
Microfluidic labchips have achieved much advancement in the molecular diagnosis of foodborne pathogens. Whereas difficulties in the flow control during the transportation of liquid fluids can occur and should be overcome. Manipulations of reaction temperature and the complex procedures from sample pre-treatment to analysis in a single chip device are major obstacles for the on-site application. Thus, the efficient temperature control of samples without any flow of reaction fluids in microfluidic channels of plastic chip and the simplest protocol omitting post-enrichment processing steps may overcome these limitations represented by the stability and the complexity, respectively. This study aims to develop a novel type of labchip and thermocycler specialized for the gene amplification in microfluidic channels and to evaluate the detectability by sensing the minimum recoverable level of Cronobacter in powdered infant formula (PIF). We developed a thermocycling device accelerating reactions through dual heating-blocks optimized to control temperatures of samples in microfluidic-channels by direct contact with labchip sequentially and repetitively. The structural design of microfluidic channels was to eliminate interference factors associated with the optical detection of fluorescent signals (without distortion due to air bubbles in the reaction chamber). To improve the applicability, a portable device and simplified operation to allow direct loading of samples in the chip without post-enrichment procedures were also adopted. Detection performance was evaluated by a sensitivity/specificity tests using 50 isolates of Cronobacter. Cross-reactivity tests for non-Cronobacter organisms and gDNA [human, raw materials of PIF (cow, soybean)] showed that there was no interference-factor causing false-positive results. In terms of the applied research conducted by using PIF, the enrichment of samples without broth medium (distilled water) displayed outstanding performance and 12 h of incubation facilitated detecting target at concentration as low as 1 CFU/300 g PIF (as initial contamination level) without post-enrichment treatment. Validation of the operation conditions using 30 commercial PIF products was also consistent. The present study presents a novel approach of microfluidic technology with perspective to not only the performance and the practicability [easy-to-implement protocol, portable materials, cost-effectiveness (the use of a miniaturized plastic chip requires a minimum level of materials)] for on-site diagnosis.
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Hong H, Sun C, Wei S, Sun X, Mutukumira A, Wu X. Development of a real-time recombinase polymerase amplification assay for rapid detection of Salmonella in powdered infant formula. Int Dairy J 2020. [DOI: 10.1016/j.idairyj.2019.104579] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Chen Q, Jun L, Qiu Y, Zhao L. Short communication: Bioinformatics-based mining of novel gene targets for identification of Cronobacter turicensis using PCR. J Dairy Sci 2019; 102:6023-6026. [DOI: 10.3168/jds.2018-15929] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 02/12/2019] [Indexed: 01/13/2023]
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Tomas D, Fan M, Zhu S, Klijn A. Use of biochemical miniaturized galleries, rRNA based lateral flow assay and Real Time PCR for Cronobacter spp. confirmation. Food Microbiol 2018; 76:189-195. [DOI: 10.1016/j.fm.2018.05.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 05/04/2018] [Accepted: 05/21/2018] [Indexed: 10/16/2022]
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Liu S, Geng Y, Liu L, Sun X, Shao J, Han B, Wang J, Tan K. Development of an isothermal amplification-based assay for the rapid detection of Cronobacter spp. J Dairy Sci 2018. [PMID: 29525314 DOI: 10.3168/jds.2017-13931] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Cronobacter spp. is an opportunistic pathogen that is associated with rare but life-threatening neonatal infections resulting from the consumption of contaminated powdered infant formula milk (PIF). In the present study, we developed recombinase polymerase amplification (RPA) and real-time RPA for the detection of Cronobacter spp. in PIF for the first time by targeting the ompA gene. The specificity and sensitivity of the RPA and real-time RPA were validated and the practical applicability of these methods for the detection of Cronobacter spp. in artificially contaminated PIF samples was proved by comparing their reaction time, sensitivity, and efficacy with those of real-time PCR and the Chinese traditional method. The RPA and real-time RPA assays reduced the analysis time to less than 15 min and the results were as reliable as those of real-time PCR. Taken together, the RPA and real-time RPA assays served as fast, reliable, and sensitive techniques for the detection of Cronobacter spp.
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Affiliation(s)
- Siying Liu
- Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China
| | - Yunyun Geng
- Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China; College of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050020, China
| | - Libing Liu
- Center of Inspection and Quarantine, Hebei Entry-Exit Inspection and Quarantine Bureau, Shijiazhuang, Hebei 050051, China; Hebei Academy of Inspection and Quarantine Science and Technology, Shijiazhuang, Hebei 050051, China
| | - Xiaoxia Sun
- Center of Inspection and Quarantine, Hebei Entry-Exit Inspection and Quarantine Bureau, Shijiazhuang, Hebei 050051, China; Hebei Academy of Inspection and Quarantine Science and Technology, Shijiazhuang, Hebei 050051, China
| | - Jingyu Shao
- Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China
| | - Beibei Han
- Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China
| | - Jianchang Wang
- Center of Inspection and Quarantine, Hebei Entry-Exit Inspection and Quarantine Bureau, Shijiazhuang, Hebei 050051, China; Hebei Academy of Inspection and Quarantine Science and Technology, Shijiazhuang, Hebei 050051, China.
| | - Ke Tan
- Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology of Hebei Province, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China.
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Tutar E, Akıncı KS, Akyol İ. Development and application of a new multiplex real-time PCR assay for simultaneous identification of Brucella melitensis
, Cronobacter sakazakii
and Listeria monocytogenes
in raw milk and cheese. INT J DAIRY TECHNOL 2018. [DOI: 10.1111/1471-0307.12500] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Esen Tutar
- Science and Letters Faculty; Kahramanmaraş Sütçü İmam University; 46060/Avşar Campus Kahramanmaraş Turkey
| | - Kübra Sueda Akıncı
- Health Sciences University; Health Sciences Faculty; Department of Nutrition and Dietetics; 34668/Üsküdar İstanbul Turkey
| | - İsmaİl Akyol
- Agricultural Biotechnology Department; Agriculture Faculty; Kahramanmaraş Sütçü İmam University; 46060/Avşar Campus Kahramanmaraş Turkey
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Li X, Cui J, Du X, Cui Z, Huang Y, Kan B. Duplex Real-Time PCR Method for the Differentiation of Cronobacter sakazakii and Cronobacter malonaticus. J Food Prot 2017; 80:50-56. [PMID: 28221877 DOI: 10.4315/0362-028x.jfp-16-171] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Cronobacter sakazakii and Cronobacter malonaticus are the most common species of Cronobacter , so it is necessary to detect the two species as soon as possible in surveillance programs. We developed a real-time PCR method for identifying C. sakazakii and C. malonaticus from the genus Cronobacter . In this study, the two pairs of primers and probes were designed, targeting 16S rRNA and fusA, respectively. The specificity of the real-time PCR assay was validated with 112 strains of Cronobacter , including 56 C. sakazakii , 32 C. malonaticus , 16 Cronobacter dublinensis , 6 Cronobacter turicensis , and 2 Cronobacter muytjensii . The results showed that C. sakazakii and C. malonaticus were all correctly identified, consistent with the results of another method by analyzing the clustering of the fusA sequence. The detection limit for pure culture was 102 CFU/ml and 103 CFU/g for artificially contaminated rehydrated powdered infant formula. Therefore, the developed real-time PCR was a rapid, sensitive, and reliable method for the identification of C. sakazakii and C. malonaticus .
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Affiliation(s)
- Xiaofang Li
- National Institute for Communicable Disease Control and Prevention and State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, Beijing 102206, People's Republic of China.,Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education and School of Life Sciences, Jilin University, Changchun 130012, People's Republic of China
| | - Jinghua Cui
- National Institute for Communicable Disease Control and Prevention and State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, Beijing 102206, People's Republic of China
| | - Xiaoli Du
- National Institute for Communicable Disease Control and Prevention and State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, Beijing 102206, People's Republic of China
| | - Zhigang Cui
- National Institute for Communicable Disease Control and Prevention and State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, Beijing 102206, People's Republic of China
| | - Yibing Huang
- Key Laboratory for Molecular Enzymology and Engineering of the Ministry of Education and School of Life Sciences, Jilin University, Changchun 130012, People's Republic of China
| | - Biao Kan
- National Institute for Communicable Disease Control and Prevention and State Key Laboratory for Infectious Disease Prevention and Control, Chinese Center for Disease Control and Prevention, Beijing 102206, People's Republic of China
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