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Zhang M, Liu J, Shen Z, Liu Y, Song Y, Liang Y, Li Z, Nie L, Fang Y, Zhao Y. A newly developed paper embedded microchip based on LAMP for rapid multiple detections of foodborne pathogens. BMC Microbiol 2021; 21:197. [PMID: 34182947 PMCID: PMC8240391 DOI: 10.1186/s12866-021-02223-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 04/30/2021] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Microfluidic chip detection technology is considered a potent tool for many bioanalytic applications. Rapid detection of foodborne pathogens in the early stages is imperative to prevent the outbreak of foodborne diseases, known as a severe threat to human health. Conventional bacterial culture methods for detecting foodborne pathogens are time-consuming, laborious, and lacking in pathogen diagnosis. To overcome this problem, we have created an embedded paper-based microchip based on isothermal loop amplification (LAMP), which can rapidly and sensitively detect foodborne pathogens. RESULTS We embed paper impregnated with LAMP reagent and specific primers in multiple reaction chambers of the microchip. The solution containing the target pathogen was injected into the center chamber and uniformly distributed into the reaction chamber by centrifugal force. The purified DNA of Escherichia coli O157:H7, Salmonella spp., Staphylococcus aureus, and Vibrio parahaemolyticus has been successfully amplified and directly detected on the microchip. The E. coli O157:H7 DNA was identified as low as 0.0134 ng μL- 1. Besides, the potential of this microchip in point-of-care testing was further tested by combining the on-chip sample purification module and using milk spiked with Salmonella spp.. The pyrolyzed milk sample was filtered through a polydopamine-coated paper embedded in the inside of the sample chamber. It was transported to the reaction chamber by centrifugal force for LAMP amplification. Then direct chip detection was performed in the reaction chamber embedded with calcein-soaked paper. The detection limit of Salmonella spp. in the sample measured by the microchip was approximately 12 CFU mL- 1. CONCLUSION The paper embedded LAMP microchip offers inexpensive, user-friendly, and highly selective pathogen detection capabilities. It is expected to have great potential as a quick, efficient, and cost-effective solution for future foodborne pathogen detection.
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Affiliation(s)
- Mimi Zhang
- College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China.
| | - Jinfeng Liu
- College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
| | - Zhiqiang Shen
- Tianjin Institute of Health and Environmental Medicine, A Key Laboratory of Risk Assessment and Control for Environment and Food Safety, Tianjin, 300050, China.
| | - Yongxin Liu
- College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
| | - Yang Song
- College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
| | - Yu Liang
- Tianjin Institute of Health and Environmental Medicine, A Key Laboratory of Risk Assessment and Control for Environment and Food Safety, Tianjin, 300050, China
| | - Zhende Li
- College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
| | - Lingmei Nie
- College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
| | - Yanjun Fang
- Tianjin Institute of Health and Environmental Medicine, A Key Laboratory of Risk Assessment and Control for Environment and Food Safety, Tianjin, 300050, China
| | - Youquan Zhao
- College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China.
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Abstract
The three main oral diseases of humans, that is, caries, periodontal diseases, and oral candidiasis, are associated with microbiome shifts initiated by changes in the oral environment and/or decreased effectiveness of mucosal immune surveillance. In this review, we discuss the role that microbial-based therapies may have in the control of these conditions. Most investigations on the use of microorganisms for management of oral disease have been conducted with probiotic strains with some positive but very discrete clinical outcomes. Other strategies such as whole oral microbiome transplantation or modification of community function by enrichment with health-promoting indigenous oral strains may offer more promise, but research in this field is still in its infancy. Any microbial-based therapeutics for oral conditions, however, are likely to be only one component within a holistic preventive strategy that should also aim at modification of the environmental influences responsible for the initiation and perpetuation of microbiome shifts associated with oral dysbiosis.
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do Nascimento C, Paulo DF, Pita MS, Pedrazzi V, de Albuquerque Junior RF. Microbial diversity of the supra- and subgingival biofilm of healthy individuals after brushing with chlorhexidine- or silver-coated toothbrush bristles. Can J Microbiol 2015; 61:112-23. [DOI: 10.1139/cjm-2014-0565] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Nanoparticulate silver has recently been reported as an effective antimicrobial agent. The aim of this clinical study was to investigate the potential changes on the oral microbiota of healthy individuals after controlled brushing with chlorhexidine- or silver-coated toothbrush bristles. Twenty-four healthy participants were enrolled in this investigation and randomly submitted to 3 interventions. All the participants received, in a crossover format, the following toothbrushing interventions: (i) chlorhexidine-coated bristles, (ii) silver-coated bristles, and (iii) conventional toothbrush (Control). All the interventions had a duration of 30 days. The DNA checkerboard hybridization method was used to identify and quantify up to 43 microbial species colonizing the supra- and subgingival biofilm. The supragingival samples presented higher genome counts than the subgingival samples (p < 0.0001). The total genome counts from the Control group showed the highest values, followed by the silver and chlorhexidine groups (p < 0.0001). After 4 weeks of brushing, the silver-coated and chlorhexidine-coated bristles were capable of reducing or maintaining lower levels of the bacterial counts of the putative periodontal pathogens Tanerella forsythia, Treponema denticola, and Porphyromonas gingivalis. Other major periodontal pathogens, such as Prevotella intermedia, Fusobacterium nucleatum, Prevotella nigrescens, and Parvimonas micra, were also detected at lower levels. The toothbrush bristles impregnated with silver nanoparticles reduced the total and individual genome count in the supra- and subgingival biofilm after 4 weeks of brushing. Chlorhexidine was not effective in reducing the total genome counts in both supra- or subgingival biofilm after 4 weeks of brushing. Chlorhexidine reduced the individual genome counts in the supragingival biofilm for most of the target species, including putative periodontal pathogens.
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Affiliation(s)
- Cássio do Nascimento
- Faculty of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthodontics, Molecular Diagnosis Laboratory, University of São Paulo, Av. Café s/n°, Monte Alegre, Ribeirão Preto-SP, 14040-904, Brazil
| | - Diana Ferreira Paulo
- Faculty of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthodontics, Molecular Diagnosis Laboratory, University of São Paulo, Av. Café s/n°, Monte Alegre, Ribeirão Preto-SP, 14040-904, Brazil
| | - Murillo Sucena Pita
- Faculty of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthodontics, Molecular Diagnosis Laboratory, University of São Paulo, Av. Café s/n°, Monte Alegre, Ribeirão Preto-SP, 14040-904, Brazil
| | - Vinícius Pedrazzi
- Faculty of Dentistry of Ribeirão Preto, Department of Dental Materials and Prosthodontics, Molecular Diagnosis Laboratory, University of São Paulo, Av. Café s/n°, Monte Alegre, Ribeirão Preto-SP, 14040-904, Brazil
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do Nascimento C, dos Santos JN, Pedrazzi V, Pita MS, Monesi N, Ribeiro RF, de Albuquerque RF. Impact of temperature and time storage on the microbial detection of oral samples by Checkerboard DNA–DNA hybridization method. Arch Oral Biol 2014; 59:12-21. [DOI: 10.1016/j.archoralbio.2013.10.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 09/16/2013] [Accepted: 10/15/2013] [Indexed: 11/29/2022]
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do Nascimento C, Pita MS, Pedrazzi V, de Albuquerque Junior RF, Ribeiro RF. In vivo evaluation of Candida spp. adhesion on titanium or zirconia abutment surfaces. Arch Oral Biol 2013; 58:853-61. [DOI: 10.1016/j.archoralbio.2013.01.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 12/07/2012] [Accepted: 01/08/2013] [Indexed: 11/16/2022]
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Molecular Methods for Diagnosis of Odontogenic Infections. J Oral Maxillofac Surg 2012; 70:1854-9. [DOI: 10.1016/j.joms.2011.09.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Accepted: 09/06/2011] [Indexed: 11/19/2022]
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do Nascimento C, Muller K, Sato S, Albuquerque Junior RF. Effect of sample storage time on detection of hybridization signals in Checkerboard DNA–DNA hybridization. Can J Microbiol 2012; 58:502-6. [DOI: 10.1139/w2012-021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Long-term sample storage can affect the intensity of the hybridization signals provided by molecular diagnostic methods that use chemiluminescent detection. The aim of this study was to evaluate the effect of different storage times on the hybridization signals of 13 bacterial species detected by the Checkerboard DNA–DNA hybridization method using whole-genomic DNA probes. Ninety-six subgingival biofilm samples were collected from 36 healthy subjects, and the intensity of hybridization signals was evaluated at 4 different time periods: (1) immediately after collecting (n = 24) and (2) after storage at –20 °C for 6 months (n = 24), (3) for 12 months (n = 24), and (4) for 24 months (n = 24). The intensity of hybridization signals obtained from groups 1 and 2 were significantly higher than in the other groups (p < 0.001). No differences were found between groups 1 and 2 (p > 0.05). The Checkerboard DNA–DNA hybridization method was suitable to detect hybridization signals from all groups evaluated, and the intensity of signals decreased significantly after long periods of sample storage.
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Affiliation(s)
- Cássio do Nascimento
- Department of Dental Materials and Prosthodontics, Faculty of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Katia Muller
- Faculty of Dentistry, McGill University, Montréal, Quebec, Canada
| | - Sandra Sato
- Department of Dental Materials and Prosthodontics, Faculty of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Rubens Ferreira Albuquerque Junior
- Department of Dental Materials and Prosthodontics, Faculty of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
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Alternative method for direct DNA probe labeling and detection using the checkerboard hybridization format. J Clin Microbiol 2010; 48:3039-40. [PMID: 20554808 DOI: 10.1128/jcm.00390-10] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Niimi M, Firth NA, Cannon RD. Antifungal drug resistance of oral fungi. Odontology 2010; 98:15-25. [PMID: 20155503 DOI: 10.1007/s10266-009-0118-3] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2009] [Accepted: 11/28/2009] [Indexed: 01/19/2023]
Abstract
Fungi comprise a minor component of the oral microbiota but give rise to oral disease in a significant proportion of the population. The most common form of oral fungal disease is oral candidiasis, which has a number of presentations. The mainstay for the treatment of oral candidiasis is the use of polyenes, such as nystatin and amphotericin B, and azoles including miconazole, fluconazole, and itraconazole. Resistance of fungi to polyenes is rare, but some Candida species, such as Candida glabrata and C. krusei, are innately less susceptible to azoles, and C. albicans can acquire azole resistance. The main mechanism of high-level fungal azole resistance, measured in vitro, is energy-dependent drug efflux. Most fungi in the oral cavity, however, are present in multispecies biofilms that typically demonstrate an antifungal resistance phenotype. This resistance is the result of multiple factors including the expression of efflux pumps in the fungal cell membrane, biofilm matrix permeability, and a stress response in the fungal cell. Removal of dental biofilms, or treatments to prevent biofilm development in combination with antifungal drugs, may enable better treatment and prevention of oral fungal disease.
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Affiliation(s)
- Masakazu Niimi
- Department of Oral Sciences, School of Dentistry, University of Otago, 310 Great King Street, Dunedin, 9016, New Zealand
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Current awareness on yeast. Yeast 2009. [DOI: 10.1002/yea.1626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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De Souza RF, Nascimento C, Regis RR, Silva-Lovato CH, Paranhos HFO. Effects of the domestic use of a disclosing solution on the denture biofilm: a preliminary study. J Oral Rehabil 2009; 36:491-7. [PMID: 19486269 DOI: 10.1111/j.1365-2842.2009.01964.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
To investigate the effect of the home use of a disclosing agent on the microbial composition of denture biofilm, by means of a cross-over randomized clinical trial. Two interventions were tested during 7 days each: (I) oral and denture hygiene instructions and (II) instructions associated with the home use of a disclosing agent (1% neutral red). Eleven participants with visible biofilm deposits over their maxillary complete dentures were randomly assigned to one of the two sequences of interventions: (i) I followed by II, and (ii) II followed by I. A washout period of 7 days was established. After each intervention, samples of denture biofilm were evaluated by DNA checkerboard hybridization for the detection of Candida spp. and 17 bacterial species. Counts were low for all the tested species, and no significant difference was found between the tested interventions (Wilcoxon test, P > 0.05). The home use of a disclosing agent does not remarkably change the composition of denture biofilm.
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Affiliation(s)
- R F De Souza
- Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, Brazil.
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