1
|
Costa-Ribeiro A, Azinheiro S, Mota S, Prado M, Lamas A, Garrido-Maestu A. Assessment of the presence of Acinetobacter spp. resistant to β-lactams in commercial ready-to-eat salad samples. Food Microbiol 2024; 118:104410. [PMID: 38049272 DOI: 10.1016/j.fm.2023.104410] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 10/19/2023] [Accepted: 10/24/2023] [Indexed: 12/06/2023]
Abstract
Acinetobacter baumannii is a well-known nosocomial infection causing agent. However, other Acinetobacter spp. have also been implicated in cases of human infection. Additionally, these bacteria are known for the development of antibiotic resistance thus making the treatment of the infections they cause, challenging. Due to their relevance in clinical setups less attention has been paid to their presence in foods, and its relation with infection/dissemination routes. In the current study commercial Ready-To-Eat (RTE) salads were analyzed seeking for antibiotic resistant Acinetobacter spp. A preliminary screening allowed us to recover Gram-negative bacteria resistant to β - lactams using cefotaxime, third generation cephalosporins, as the selective agent, and this was followed by identification with CHROMagar™ Acinetobacter and 16S rDNA sequencing. Finally, the isolates identified as Acinetobacter spp. were reanalyzed by PCR to determine the presence of nine potential Extended Spectrum β Lactamases (ESBL). Two commercial RTE salad brands were included in the study (2 batches per brand and 8 samples of each batch making a total of 32 independent samples), and compared against an organic lettuce. High concentrations of β - lactam, resistant bacteria were found in all the samples tested (5 log CFU/g). Additionally, 209 isolates were phenotypically characterized on CHROMagar Acinetobacter. Finally, PCR analysis identified the presence of different ESBL genes, being positive for blaACC, blaSHV, blaDHA and blaVEB; out of these, blaACC was the most prevalent. None of the isolates screened were positive for more than one gene. To conclude, it is important to highlight the fact that pathogenic species within the genus Acinetobacter spp., other than A. baumannii, have been identified bearing resistance genes not typically associated to these microorganisms highlight the importance of continuous surveillance.
Collapse
Affiliation(s)
- Ana Costa-Ribeiro
- Health and Environment Research Center, School of Health, Polytechnic Institute of Porto, R. Dr. Roberto Frias 712, 4200-465, Porto, Portugal; International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal; Department of Biochemistry, Genetics and Immunology, University of Vigo, 36310, Vigo, Spain
| | - Sarah Azinheiro
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal; College of Pharmacy/School of Veterinary Sciences, University of Santiago de Compostela, Campus Vida, E-15782, Santiago de Compostela, Spain
| | - Sandra Mota
- Health and Environment Research Center, School of Health, Polytechnic Institute of Porto, R. Dr. Roberto Frias 712, 4200-465, Porto, Portugal
| | - Marta Prado
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal; Food Hygiene, Inspection and Control Laboratory (Lhica), Department of Analytical Chemistry, Nutrition and Bromatology, Veterinary School, Campus Terra, University of Santiago de Compostela, 27002, Lugo, Spain
| | - Alexandre Lamas
- Food Hygiene, Inspection and Control Laboratory (Lhica), Department of Analytical Chemistry, Nutrition and Bromatology, Veterinary School, Campus Terra, University of Santiago de Compostela, 27002, Lugo, Spain.
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal.
| |
Collapse
|
2
|
Costa-Ribeiro A, Lamas A, Mora A, Prado M, Garrido-Maestu A. Moving towards on-site detection of Shiga toxin-producing Escherichia coli in ready-to-eat leafy greens. Curr Res Food Sci 2024; 8:100716. [PMID: 38511154 PMCID: PMC10950744 DOI: 10.1016/j.crfs.2024.100716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 03/01/2024] [Accepted: 03/06/2024] [Indexed: 03/22/2024] Open
Abstract
Rapid identification of Shiga toxin-producing Escherichia coli, or STEC, is of utmost importance to assure the innocuousness of the foodstuffs. STEC have been implicated in outbreaks associated with different types of foods however, among them, ready-to-eat (RTE) vegetables are particularly problematic as they are consumed raw, and are rich in compounds that inhibit DNA-based detection methods such as qPCR. In the present study a novel method based on Loop-mediated isothermal amplification (LAMP) to overcome the limitations associated with current molecular methods for the detection of STEC in RTE vegetables targeting stx1 and stx2 genes. In this sense, LAMP demonstrated to be more robust against inhibitory substances in food. In this study, a comprehensive enrichment protocol was combined with four inexpensive DNA extraction protocols. The one based on silica purification enhanced the performance of the method, therefore it was selected for its implementation in the final method. Additionally, three different detection chemistries were compared, namely real-time fluorescence detection, and two end-point colorimetric strategies, one based on the addition of SYBR Green, and the other based on a commercial colorimetric master mix. After optimization, all three chemistries demonstrated suitable for the detection of STEC in spiked RTE salad samples, as it was possible to reach a LOD50 of 0.9, 1.4, and 7.0 CFU/25 g for the real-time, SYBR and CC LAMP assays respectively. All the performance parameters reached values higher than 90 %, when compared to a reference method based on multiplex qPCR. More specifically, the analytical sensitivity was 100, 90.0 and 100 % for real-time, SYBR and CC LAMP respectively, the specificity 100 % for all three assays, and accuracy 100, 96 and 100 %. Finally, a high degree of concordance was also obtained (1, 0.92 and 1 respectively). Considering the current technological advances, the method reported, using any of the three detection strategies, demonstrated suitable for their implementation in decentralized settings, with low equipment resources.
Collapse
Affiliation(s)
- Ana Costa-Ribeiro
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
- Department of Biochemistry, Genetics and Immunology, University of Vigo, 36310, Vigo, Spain
| | - Alexandre Lamas
- Food Hygiene, Inspection and Control Laboratory (Lhica), Department of Analytical Chemistry, Nutrition, and Bromatology, Veterinary School, Campus Terra, Universidade de Santiago de Compostela (USC), 27002, Lugo, Spain
| | - Azucena Mora
- Laboratorio de Referencia de E. coli (LREC), Dpto. de Microbioloxía e Parasitoloxía, Facultade de Veterinaria, Universidade de Santiago de Compostela (USC), Lugo, Spain
- Instituto de Investigación Sanitaria de Santiago de Compostela (IDIS), Santiago, Spain
| | - Marta Prado
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
- Food Hygiene, Inspection and Control Laboratory (Lhica), Department of Analytical Chemistry, Nutrition, and Bromatology, Veterinary School, Campus Terra, Universidade de Santiago de Compostela (USC), 27002, Lugo, Spain
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
- Laboratory of Microbiology and Technology of Marine Products (MicroTEC), Instituto de Investigaciones Marinas (IIM), CSIC, Eduardo Cabello, 6, 36208, Vigo, Spain
| |
Collapse
|
3
|
Costa-Ribeiro A, Lamas A, Prado M, Garrido-Maestu A. Evaluation of the Novel mTA10 Selective Broth, MSB, for the Co-Enrichment and Detection of Salmonella spp., Escherichia coli O157 and Listeria monocytogenes in Ready-to-Eat Salad Samples. Foods 2023; 13:63. [PMID: 38201091 PMCID: PMC10778508 DOI: 10.3390/foods13010063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 12/19/2023] [Accepted: 12/21/2023] [Indexed: 01/12/2024] Open
Abstract
Multiplex assays implementing DNA-based methods have been demonstrated as suitable alternatives to culture-based microbiological methods; however, in most cases, they still require a suitable enrichment step. Finding suitable enrichment conditions for different bacteria may result in challenges. In the present study, a novel selective broth named MSB (mTA10 selective broth) was formulated for the simultaneous recovery of Salmonella spp., E. coli O157:H7 and L. monocytogenes. Attention was paid to ensure the optimal enrichment of L. monocytogenes as its enrichment is more challenging. To this end, cellobiose was added to increase the growth of L. monocytogenes, and sodium pyruvate was also added to improve the recovery of stressed bacteria. Four selective agents were added, namely nalidixic acid, sodium cholate, lithium chloride and potassium tellurite, to control the growth of interfering microorganisms. It was concluded that the novel broth was suitable for the simultaneous enrichment of the target pathogens, allowing them to reach concentrations higher than 7 log CFU/mL for each bacterium in pure culture. Furthermore, all heavily contaminated ready-to-eat salad samples reached concentrations higher than 5 log CFU/g. Finally, after 24 h of enrichment of spiked salad, it was possible to detect concentrations below 10 CFU/25 g.
Collapse
Affiliation(s)
- Ana Costa-Ribeiro
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (A.C.-R.); (M.P.)
- Department of Biochemistry, Genetics and Immunology, University of Vigo, 36310 Vigo, Spain
| | - Alexandre Lamas
- Food Hygiene, Inspection and Control Laboratory (Lhica), Department of Analytical Chemistry, Nutrition and Bromatology, Veterinary School, Campus Terra, University of Santiago de Compostela (USC), 27002 Lugo, Spain;
| | - Marta Prado
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (A.C.-R.); (M.P.)
- Food Hygiene, Inspection and Control Laboratory (Lhica), Department of Analytical Chemistry, Nutrition and Bromatology, Veterinary School, Campus Terra, University of Santiago de Compostela (USC), 27002 Lugo, Spain;
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (A.C.-R.); (M.P.)
| |
Collapse
|
4
|
Lamas A, Garrido-Maestu A, Prieto A, Cepeda A, Franco CM. Whole genome sequencing in the palm of your hand: how to implement a MinION Galaxy-based workflow in a food safety laboratory for rapid Salmonella spp. serotyping, virulence, and antimicrobial resistance gene identification. Front Microbiol 2023; 14:1254692. [PMID: 38107857 PMCID: PMC10722185 DOI: 10.3389/fmicb.2023.1254692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 11/02/2023] [Indexed: 12/19/2023] Open
Abstract
Introduction Whole Genome Sequencing (WGS) implementation in food safety laboratories is a significant advancement in food pathogen control and outbreak tracking. However, the initial investment for acquiring next-generation sequencing platforms and the need for bioinformatic skills represented an obstacle for the widespread use of WGS. Long-reading technologies, such as the one developed by Oxford Nanopore Technologies, can be easily implemented with a minor initial investment and with simple protocols that can be performed with basic laboratory equipment. Methods Herein, we report a simple MinION Galaxy-based workflow with analysis parameters that allow its implementation in food safety laboratories with limited computer resources and without previous knowledge in bioinformatics for rapid Salmonella serotyping, virulence, and identification of antimicrobial resistance genes. For that purpose, the single use Flongle flow cells, along with the MinION Mk1B for WGS, and the community-driven web-based analysis platform Galaxy for bioinformatic analysis was used. Three strains belonging to three different serotypes, monophasic S. Typhimurium, S. Grancanaria, and S. Senftenberg, were sequenced. Results After 24 h of sequencing, enough coverage was achieved in order to perform de novo assembly in all three strains. After evaluating different tools, Flye de novo assemblies with medaka polishing were shown to be optimal for in silico Salmonella spp. serotyping with SISRT tool followed by antimicrobial and virulence gene identification with ABRicate. Discussion The implementation of the present workflow in food safety laboratories with limited computer resources allows a rapid characterization of Salmonella spp. isolates.
Collapse
Affiliation(s)
- Alexandre Lamas
- Food Hygiene, Inspection and Control Laboratory (Lhica), Department of Analytical Chemistry, Nutrition and Bromatology, Veterinary School, Universidade da Santiago de Compostela, Lugo, Spain
| | - Alejandro Garrido-Maestu
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
| | - Alberto Prieto
- Department of Animal Pathology (INVESAGA Group), Faculty of Veterinary Sciences, Universidade de Santiago de Compostela, Lugo, Spain
| | - Alberto Cepeda
- Food Hygiene, Inspection and Control Laboratory (Lhica), Department of Analytical Chemistry, Nutrition and Bromatology, Veterinary School, Universidade da Santiago de Compostela, Lugo, Spain
| | - Carlos Manuel Franco
- Food Hygiene, Inspection and Control Laboratory (Lhica), Department of Analytical Chemistry, Nutrition and Bromatology, Veterinary School, Universidade da Santiago de Compostela, Lugo, Spain
| |
Collapse
|
5
|
Lamas A, Santos SB, Prado M, Garrido-Maestu A. Phage amplification coupled with loop-mediated isothermal amplification (PA-LAMP) for same-day detection of viable Salmonella Enteritidis in raw poultry meat. Food Microbiol 2023; 115:104341. [PMID: 37567642 DOI: 10.1016/j.fm.2023.104341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 07/10/2023] [Accepted: 07/10/2023] [Indexed: 08/13/2023]
Abstract
Salmonella Enteritidis is the main serotype responsible for human salmonellosis in the European Union. One of the main sources of Salmonella spp. in the food chain are poultry products, such as eggs or chicken meat. In recent years, molecular methods have become an alternative to culture dependent methods for the rapid screening of Salmonella spp. In this work, the strain S. Enteritidis S1400, and previously isolated and characterized bacteriophage PVP-SE2, were used to develop and evaluate a same-day detection method combining Phage Amplification and Loop-mediated isothermal amplification (PA-LAMP) to specifically detect viable S. Enteritidis in chicken breast. This method is based on the detection of the phage DNA rather than bacterial DNA. The virus is added to the sample during pre-enrichment in buffered peptone water, where it replicates in the presence of viable S. Enteritidis. The detection of phage DNA allows, on the one hand to detect viable bacteria, since viruses only replicate in them, and on the other hand to increase the sensitivity of the method since for each infected S. Enteritidis cell, hundreds of new viruses are produced. Two different PA-LAMP detection strategies were evaluated, a real time fluorescence and a naked-eye detection. The present method could down to 0.2 fg/μL of pure phage DNA and a concentration of viral particles of 2.2 log PFU/mL. After a short Salmonella recovery step of 3 h and a co-culture of 4 h of the samples with phage particles, both real-time fluorescence and naked-eye method showed a LoD95 of 6.6 CFU/25 g and a LoD50 of 1.5/25 g in spiked chicken breast samples. The entire detection process, including DNA extraction and LAMP analysis, can be completed in around 8 h. In the current proof-of-concept, the novel PA-LAMP obtained comparable results to those of the reference method ISO 6579, to detect Salmonella Enteritidis in poultry meat.
Collapse
Affiliation(s)
- Alexandre Lamas
- Food Hygiene, Inspection and Control Laboratory, Department of Analytical Chemistry, Nutrition and Bromatology, University of Santiago de Compostela, Spain
| | - Sílvio B Santos
- Centre of Biological Engineering, University of Minho, 4710-057, Braga, Portugal; LABBELS - Associate Laboratory, 4800-122, Braga, Guimarães, Portugal
| | - Marta Prado
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal.
| |
Collapse
|
6
|
Pereira S, Costa-Ribeiro A, Teixeira P, Rodríguez-Lorenzo L, Prado M, Cerqueira MA, Garrido-Maestu A. Evaluation of the Antimicrobial Activity of Chitosan Nanoparticles against Listeria monocytogenes. Polymers (Basel) 2023; 15:3759. [PMID: 37765613 PMCID: PMC10538158 DOI: 10.3390/polym15183759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 09/06/2023] [Accepted: 09/10/2023] [Indexed: 09/29/2023] Open
Abstract
Chitosan is obtained from the deacetylation of chitin, and it is known to possess antimicrobial activity. It has attracted attention as it may be used for treating infections caused by different types of microorganisms due to its broad spectrum. Its application in the form of micro- or nanoparticles (CM/CN) has expanded its usage, as in this form, it retains its activity, and remain stable in aqueous solutions. However, inconsistencies in the results reported by different authors have been identified. In this communication, the antimicrobial activity of CN produced from different starting materials was tested against Listeria monocytogenes. It was observed that, even though all the starting materials were reported to have a molecular weight (MW) below 200 kDa and degree of deacetylation (DD) > 75%, the size of the CNs were significantly different (263 nm vs. 607 nm). Furthermore, these differences in sizes exerted a direct effect on the antimicrobial properties of the particles, as when testing the ones with the smallest size, i.e., 263 nm, a lower Minimum Inhibitory Concentration (MIC) was achieved, i.e., 0.04 mg/mL. Even though the largest particles, i.e., 607 nm, in individual experiments were able to achieve an MIC of 0.03 mg/mL, the results with CN presented great variation among replicates and up to 0.2 mg/mL were needed in other replicates. The starting material has a critical impact on the properties of the CN, and it must be carefully characterized and selected for the intended application, and MW and DD solely do not fully account for these properties.
Collapse
Affiliation(s)
- Sara Pereira
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (S.P.); (L.R.-L.); (M.P.); (M.A.C.)
- CEB—Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal;
- LABBELS—Associate Laboratory, 4710-057 Braga, Portugal
| | - Ana Costa-Ribeiro
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (S.P.); (L.R.-L.); (M.P.); (M.A.C.)
- Department of Biochemistry, Genetics and Immunology, University of Vigo, 36310 Vigo, Spain
| | - Pilar Teixeira
- CEB—Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal;
- LABBELS—Associate Laboratory, 4710-057 Braga, Portugal
| | - Laura Rodríguez-Lorenzo
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (S.P.); (L.R.-L.); (M.P.); (M.A.C.)
| | - Marta Prado
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (S.P.); (L.R.-L.); (M.P.); (M.A.C.)
| | - Miguel A. Cerqueira
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (S.P.); (L.R.-L.); (M.P.); (M.A.C.)
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (S.P.); (L.R.-L.); (M.P.); (M.A.C.)
| |
Collapse
|
7
|
Costa-Ribeiro A, Azinheiro S, Fernandes SPS, Lamas A, Prado M, Salonen LM, Garrido-Maestu A. Evaluation of Covalent Organic Frameworks for the low-cost, rapid detection of Shiga Toxin-producing Escherichia coli in ready-to-eat salads. Anal Chim Acta 2023; 1267:341357. [PMID: 37257973 DOI: 10.1016/j.aca.2023.341357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 05/08/2023] [Accepted: 05/09/2023] [Indexed: 06/02/2023]
Abstract
BACKGROUND Ready-to-eat products, such as leafy greens, must be carefully controlled as they are directly consumed without any treatment to reduce the presence of potential pathogens. Food industries, especially those that process products with short shelf-life, demand rapid detection of foodborne pathogens such as Shiga Toxin-producing Escherichia coli (STEC). In this sense, molecular methods can fulfill both requirements of turnaround time and consumer safety. The most popular rapid methods are those based on real-time PCR (qPCR) however, vegetables contain inhibitory compounds that may inhibit the amplification reaction thus, there is a need for novel sample preparation protocols. RESULTS In the current study, a low-cost sample treatment based on sequential filtration steps was developed. This protocol was combined with covalent organic frameworks (COFs), and compared against a chelating resin, to evaluate their performance by multiplex qPCR targeting the major virulence genes of STEC, namely stx1, stx2, and eae, along with the rfbE for the specific identification of serogroup O157 due to its particularly high incidence, and an Internal Amplification Control to assess reaction inhibition. The optimized sample treatment effectively removed vegetable qPCR inhibitory compounds, and it was possible to detect STEC in spiked ready-to-eat salad samples in one working day, roughly 5 h, with an LOD50 of 8.7 CFU/25 g with high diagnostic sensitivity and specificity. The method was also assessed in samples with cold-stressed bacteria with good results, further demonstrating its applicability. SIGNIFICANCE It was demonstrated for the first time that COFs are suitable for DNA extraction and purification. In addition to this, due to the tunable nature of these materials, it is envisioned that future modifications in terms of pore size or combination with magnetic materials, will allow to further improve their performance. In addition to this, the rapid and low-cost sample treatment protocol developed demonstrated suitable for the rapid screening of STEC vegetable samples.
Collapse
Affiliation(s)
- Ana Costa-Ribeiro
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal; Health and Environment Research Center, School of Health, Polytechnic Institute of Porto, R. Dr. Roberto Frias 712, 4200-465, Porto, Portugal; Department of Biochemistry, Genetics and Immunology, University of Vigo, 36310, Vigo, Spain
| | - Sarah Azinheiro
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal; College of Pharmacy/School of Veterinary Sciences, University of Santiago de Compostela, Campus Vida, E-15782, Santiago de Compostela, Spain
| | - Soraia P S Fernandes
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal; Associate Laboratory for Green Chemistry - Network of Chemistry and Technology (LAQV-REQUIMTE), Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193, Aveiro, Portugal
| | - Alexandre Lamas
- Department of Analytical Chemistry, Nutrition and Bromatology, University of Santiago de Compostela, 27002, Lugo, Spain
| | - Marta Prado
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Laura M Salonen
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal; CINBIO, Universidade de Vigo, Department of Organic Chemistry, 36310, Vigo, Spain.
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal.
| |
Collapse
|
8
|
Azinheiro S, Rodríguez-López P, Lozano-León A, Guedes H, Regal P, Franco CM, Cepeda A, Teixeira P, Melo LD, Silva D, Fernández A, Faria M, Roumani F, Herrera J, Prado M, López-Cabo M, Garrido-Maestu A. Interlaboratory validation of a multiplex qPCR method for the detection of Listeria monocytogenes in a ready-to-eat seafood product. Food Control 2023. [DOI: 10.1016/j.foodcont.2023.109769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
|
9
|
Lamas A, Azinheiro S, Roumani F, Prado M, Garrido-Maestu A. Evaluation of the effect of outer primer structure, and inner primer linker sequences, in the performance of Loop-mediated isothermal amplification. Talanta 2023; 260:124642. [PMID: 37167680 DOI: 10.1016/j.talanta.2023.124642] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 04/27/2023] [Accepted: 05/02/2023] [Indexed: 05/13/2023]
Abstract
Loop-mediated isothermal amplification, or LAMP, is nowadays the most popular isothermal nucleic acid amplification technique. This technique implements a minimum of four primers, named outer (F3/B3) and inner primers (FIP/BIP). The inner primers hybridize in two distinct regions, and some studies have reported that the usage of a linker, typically composed of four thymines, in the middle of these primers can improve assay performance. In addition to this, dual-priming oligonucleotides, DPO, have been reported to provide highly specific reducing non-specific amplifications. Considering the large number of primers implemented in LAMP assays, in the current study the suitability of DPO primers replacing regular outer primers; and their combination with different linker sequences in the inner primers were explored. The results demonstrated that replacing standard F3/B3 by DPO primers does not significantly affect that overall performance of the assay, and provides additional stability to temperature changes. This observations were consistent regardless the type of linker implemented in the inner primers, out of which in the current study a linker composed of thymines significantly outperformed the other options tested, most likely due to a combination of sequence and physical structure.
Collapse
Affiliation(s)
- Alexandre Lamas
- Food Hygiene, Inspection and Control Laboratory, Department of Analytical Chemistry, Nutrition and Bromatology, Universidad de Santiago de Compostela, 27002, Lugo, Spain
| | - Sarah Azinheiro
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal; Department of Analytical Chemistry, Nutrition and Food Science, Faculty of Veterinary Science, University of Santiago de Compostela, 27002, Lugo, Spain
| | - Foteini Roumani
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal; Department of Analytical Chemistry, Nutrition and Food Science, Faculty of Veterinary Science, University of Santiago de Compostela, 27002, Lugo, Spain
| | - Marta Prado
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal.
| |
Collapse
|
10
|
Roumani F, Rodrigues C, Barros-Velázquez J, Garrido-Maestu A, Prado M. Correction: Development of a Panfungal Recombinase Polymerase Amplification (RPA) Method Coupled with Lateral Flow Strips for the Detection of Spoilage Fungi. FOOD ANAL METHOD 2023. [DOI: 10.1007/s12161-023-02479-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
|
11
|
Roumani F, Barros-Velázquez J, Garrido-Maestu A, Prado M. Real-time PCR, and Recombinase Polymerase Amplification combined with SYBR Green I for naked-eye detection, along with Propidium Monoazide (PMA) for the detection of viable patulin-producing fungi in apples and by-products. Food Control 2023. [DOI: 10.1016/j.foodcont.2022.109347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
12
|
Costa-Ribeiro A, Azinheiro S, Roumani F, Prado M, Lamas A, Garrido-Maestu A. Multiplex Real-Time PCR for the Detection of Shiga Toxin-Producing Escherichia coli in Foods. Methods Mol Biol 2023; 2967:63-73. [PMID: 37608103 DOI: 10.1007/978-1-0716-3358-8_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
Shiga toxin-producing Escherichia coli (STEC) is a group of human foodborne pathogens transmitted to humans through the consumption of different types of food. Their detection is mainly performed by targeting specific serogroups by classical microbiological methods and, later, by molecular typing with different techniques. The application of multiplex real-time PCR (qPCR) can significantly improve the turnaround time of the existing methodologies as in one single run it is possible to detect and characterize specific microorganisms. In the present chapter, a pentaplex qPCR assay is described for the identification of STEC which may also be applied for the rapid screening of these pathogens in different types of foods. The assay targets the most important virulence factors of these microorganisms, the genes stx1, stx2, and eae, along with the rfbE gene which encodes for the "O157" antigen as this is the most prevalent serogroup among all STEC, as well as an internal amplification control to rule out false-negative results due to qPCR inhibition.
Collapse
Affiliation(s)
- Ana Costa-Ribeiro
- International Iberian Nanotechnology Laboratory, Food Quality and Safety Research Group, Braga, Portugal
- Department of Biochemistry, Genetics and Immunology, University of Vigo, Vigo, Spain
| | - Sarah Azinheiro
- International Iberian Nanotechnology Laboratory, Food Quality and Safety Research Group, Braga, Portugal
- Department of Analytical Chemistry, Nutrition and Food Science, Faculty of Veterinary Science, University of Santiago de Compostela, Lugo, Spain
| | - Foteini Roumani
- International Iberian Nanotechnology Laboratory, Food Quality and Safety Research Group, Braga, Portugal
- Department of Analytical Chemistry, Nutrition and Food Science, Faculty of Veterinary Science, University of Santiago de Compostela, Lugo, Spain
| | - Marta Prado
- International Iberian Nanotechnology Laboratory, Food Quality and Safety Research Group, Braga, Portugal
| | - Alexandre Lamas
- Food Hygiene, Inspection and Control Laboratory, Department of Analytical Chemistry, Nutrition and Bromatology, Universidad de Santiago de Compostela, Lugo, Spain
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Food Quality and Safety Research Group, Braga, Portugal.
| |
Collapse
|
13
|
Carvalho J, Ipatov A, Rodriguez-Lorenzo L, Garrido-Maestu A, Azinheiro S, Espiña B, Barros-Velázquez J, Prado M. Towards on-site detection of gluten-containing cereals with a portable and miniaturized prototype combining isothermal DNA amplification and naked eye detection. Microchem J 2022. [DOI: 10.1016/j.microc.2022.108115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
14
|
Azinheiro S, Roumani F, Costa-Ribeiro A, Prado M, Garrido-Maestu A. Application of MinION sequencing as a tool for the rapid detection and characterization of Listeria monocytogenes in smoked salmon. Front Microbiol 2022; 13:931810. [PMID: 36033887 PMCID: PMC9399719 DOI: 10.3389/fmicb.2022.931810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 07/15/2022] [Indexed: 11/13/2022] Open
Abstract
Microbial pathogens may be present in different types of foods, and hence the development of novel methods to assure consumers' safeness is of great interest. Molecular methods are known to provide sensitive and rapid results; however, they are typically targeted approaches. In recent years, the advent of non-targeted approaches based on next-generation sequencing (NGS) has emerged as a rational way to proceed. This technology allows for the detection of several pathogens simultaneously. Furthermore, with the same set of data, it is possible to characterize the microorganisms in terms of serotype, virulence, and/ or resistance genes, among other molecular features. In the current study, a novel method for the detection of Listeria monocytogenes based on the "quasimetagenomics" approach was developed. Different enrichment media and immunomagnetic separation (IMS) strategies were compared to determine the best approach in terms of L. monocytogenes sequences generated from smoked salmon samples. Finally, the data generated were analyzed with a user-friendly workflow that simultaneously provided the species identification, serotype, and antimicrobial resistance genes. The new method was thoroughly evaluated against a culture-based approach, using smoked salmon inoculated with L. monocytogenes as the matrix of choice. The sequencing method reached a very low limit of detection (LOD50, 1.2 CFU/ 25 g) along with high diagnostic sensitivity and specificity (100%), and a perfect correlation with the culture-based method (Cohen's k = 1.00). Overall, the proposed method overcomes all the major limitations reported for the implementation of NGS as a routine food testing technology and paves the way for future developments taking its advantage into consideration.
Collapse
Affiliation(s)
- Sarah Azinheiro
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
- Department of Analytical Chemistry, Nutrition and Food Science, Faculty of Veterinary Science, University of Santiago de Compostela, Lugo, Spain
| | - Foteini Roumani
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
- Department of Analytical Chemistry, Nutrition and Food Science, Faculty of Veterinary Science, University of Santiago de Compostela, Lugo, Spain
| | - Ana Costa-Ribeiro
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
- Department of Biochemistry, Genetics and Immunology, University of Vigo, Vigo, Spain
| | - Marta Prado
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
| | - Alejandro Garrido-Maestu
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
| |
Collapse
|
15
|
Roumani F, Rodrigues C, Barros-Velázquez J, Garrido-Maestu A, Prado M. Development of a Panfungal Recombinase Polymerase Amplification (RPA) Method Coupled with Lateral Flow Strips for the Detection of Spoilage Fungi. FOOD ANAL METHOD 2022. [DOI: 10.1007/s12161-022-02242-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
16
|
Azinheiro S, Ghimire D, Carvalho J, Prado M, Garrido-Maestu A. Next-day detection of viable Listeria monocytogenes by multiplex reverse transcriptase real-time PCR. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
17
|
Garrido-Maestu A, Prado M. Naked-eye detection strategies coupled with isothermal nucleic acid amplification techniques for the detection of human pathogens. Compr Rev Food Sci Food Saf 2022; 21:1913-1939. [PMID: 35122372 DOI: 10.1111/1541-4337.12902] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 12/13/2021] [Accepted: 12/14/2021] [Indexed: 12/26/2022]
Abstract
Nucleic acid amplification-based techniques have gained acceptance by the scientific, and general, community as reference methodologies for many different applications. Since the development of the gold standard of these techniques, polymerase chain reaction (PCR), back in the 1980s many improvements have been made, and alternative techniques emerged reporting improvements over PCR. Among these, isothermal amplification approaches resulted of particular interest as could overcome the need of specialized equipment to accurately control temperature changes, but it was after year 2000 that these techniques have flourished in a huge number of novel alternatives with many different degrees of complexities and requirements. An added value is their possibility to be combined with many different naked-eye detection strategies, simplifying the resources needed, allowing to reduce cost, and serving as the basis for novel developments of lab-on-chip systems, and miniaturized devices, for point-of-care testing. In this review, we will go over different types of naked-eye detection strategies, combined with isothermal amplification. This will provide the readers up-to-date information for them to select the most appropriate strategies depending on the particular needs and resources for their experimental setup.
Collapse
Affiliation(s)
- Alejandro Garrido-Maestu
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
| | - Marta Prado
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
| |
Collapse
|
18
|
Azinheiro S, Roumani F, Rodríguez-Lorenzo L, Carvalho J, Prado M, Garrido-Maestu A. Combination of Recombinase Polymerase Amplification with SYBR Green I for naked-eye, same-day detection of Escherichia coli O157:H7 in ground meat. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108494] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
19
|
Lozano-León A, García-Omil C, Rodríguez-Souto RR, Lamas A, Garrido-Maestu A. An Evaluation of the Pathogenic Potential, and the Antimicrobial Resistance, of Salmonella Strains Isolated from Mussels. Microorganisms 2022; 10:126. [PMID: 35056575 PMCID: PMC8777845 DOI: 10.3390/microorganisms10010126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 12/30/2021] [Accepted: 01/05/2022] [Indexed: 11/27/2022] Open
Abstract
Salmonella spp. and antimicrobial resistant microorganisms are two of the most important health issues worldwide. In the present study, strains naturally isolated from mussels harvested in Galicia (one of the main production areas in the world), were genetically characterized attending to the presence of virulence and antimicrobial resistance genes. Additionally, the antimicrobial profile was also determined phenotypically. Strains presenting several virulence genes were isolated but lacked all the antimicrobial resistance genes analyzed. The fact that some of these strains presented multidrug resistance, highlighted the possibility of bearing different genes than those analyzed, or resistance based on completely different mechanisms. The current study highlights the importance of constant surveillance in order to improve the safety of foods.
Collapse
Affiliation(s)
- Antonio Lozano-León
- Laboratorio ASMECRUZ, Playa de Beluso s/n, 36939 Bueu, Spain; (A.L.-L.); (C.G.-O.); (R.R.R.-S.)
- Group CI8, Biomedical Research Center (CINBIO), Campus Universitario de Vigo, University of Vigo, 36310 Vigo, Spain
| | - Carlos García-Omil
- Laboratorio ASMECRUZ, Playa de Beluso s/n, 36939 Bueu, Spain; (A.L.-L.); (C.G.-O.); (R.R.R.-S.)
| | | | - Alexandre Lamas
- Department of Analytical Chemistry, Nutrition and Bromatology, University of Santiago de Compostela, 27002 Lugo, Spain;
| | - Alejandro Garrido-Maestu
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
| |
Collapse
|
20
|
Azinheiro S, Carvalho J, Fuciños P, Pastrana L, Prado M, Garrido-Maestu A. Short pre-enrichment and modified matrix lysis. A comparative study towards same-day detection of Listeria monocytogenes. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2021.112900] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
21
|
Carvalho J, Yadav S, Garrido-Maestu A, Azinheiro S, Trujillo I, Barros-Velázquez J, Prado M. Evaluation of simple sequence repeats (SSR) and single nucleotide polymorphism (SNP)-based methods in olive varieties from the Northwest of Spain and potential for miniaturization. Food Chemistry: Molecular Sciences 2021; 3:100038. [PMID: 35415648 PMCID: PMC8991621 DOI: 10.1016/j.fochms.2021.100038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 07/10/2021] [Accepted: 07/31/2021] [Indexed: 11/17/2022]
Abstract
SSR- and SNP-based methods were evaluated for the identification of olive varieties. SNP identification was performed for the first time for two autochthonous varieties. The potential for future miniaturization of the genotyping methods was evaluated. Allele-specific PCR provided the best results for the tested olive varieties.
Miniaturization of DNA-based techniques can bring interesting advantages for food analysis, such as portability of complex analytical procedures. In the olive oil industry, miniaturization can be particularly interesting for authenticity and traceability applications, through in situ control of raw materials before production and/or the final products. However, variety identification is challenging, and implementation on miniaturized settings must be carefully evaluated, starting from the selected analytical approach. In this work, SSR- and SNP-based genotyping strategies were investigated for the identification and differentiation of two olive varieties from the Northwest of Spain. For the selected SNPs two genotyping methods were tested: real-time allele-specific PCR and high resolution melting analysis. These methods were compared and evaluated regarding their potential for integration in a microfluidic device. Both SNP-based methods proved to be successful for identification of the selected varieties, however real-time allele-specific PCR was the one that achieved the best results when analyzing mixtures, allowing the identification of both monovarietal samples and mixtures of the varieties tested with up to 25%.
Collapse
|
22
|
Azinheiro S, Roumani F, Carvalho J, Prado M, Garrido-Maestu A. Suitability of the MinION long read sequencer for semi-targeted detection of foodborne pathogens. Anal Chim Acta 2021; 1184:339051. [PMID: 34625270 DOI: 10.1016/j.aca.2021.339051] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 09/07/2021] [Indexed: 12/20/2022]
Abstract
Foodborne pathogens are still a significant source of morbidity and mortality worldwide. In addition to this the current methodologies to track these microorganisms cannot cope with the current intensive production systems, thus novel methods are of outmost importance. DNA-based methods have already demonstrated suitable to address this issue, but most of them are targeted methods such as real-time PCR (qPCR), meaning that one will only find what is looking for, thus taking the risk of missing relevant pathogens in a given sample. To overcome this limitation we have developed an easy-to-implement methodology which enables the detection of several pathogens simultaneously by using long-read Next Generation Sequencing (NGS) with MinION. The method was named "semi-targeted" due to the combination of a non-targeted detection method, NGS, with the usage of selective media in order to partially eliminate non-pathogenic interfering bacteria. To this end, we included an enrichment step for the recovery of different pathogens, namely Salmonella Enteritidis and Typhimurium, Listeria monocytogenes and Escherichia coli O157:H7, after DNA extraction and library preparation, the samples were analyzed with MinION implementing the low-cost Flongle Flow Cells. The methodology was successfully evaluated in spiked milk samples with an excellent agreement with the results obtained by qPCR and culture-based methods. The method can provide accurate results after only 2 h of sequencing. Sample multiplexing, along with the lower cost of the Flongle Flow Cells and the reduced price of the MinION platform, make the assay cost-effective that is of importance for the food industry. Starting the method with a classical microbiological approach, the enrichment, the method is easy to implement in testing laboratories, it provides flexibility in terms of potential pathogens to be detected, and the positive results can be easily confirmed following culture-based, or other type, of confirmation procedures.
Collapse
Affiliation(s)
- Sarah Azinheiro
- Food Quality and Safety Research Group. International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga S/n, 4715-330 Braga, Portugal; College of Pharmacy/School of Veterinary Sciences. Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Spain
| | - Foteini Roumani
- Food Quality and Safety Research Group. International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga S/n, 4715-330 Braga, Portugal; College of Pharmacy/School of Veterinary Sciences. Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Spain
| | - Joana Carvalho
- Food Quality and Safety Research Group. International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga S/n, 4715-330 Braga, Portugal; College of Pharmacy/School of Veterinary Sciences. Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Spain
| | - Marta Prado
- Food Quality and Safety Research Group. International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga S/n, 4715-330 Braga, Portugal
| | - Alejandro Garrido-Maestu
- Food Quality and Safety Research Group. International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga S/n, 4715-330 Braga, Portugal.
| |
Collapse
|
23
|
Roumani F, Azinheiro S, Carvalho J, Prado M, Garrido-Maestu A. Loop-mediated isothermal amplification combined with immunomagnetic separation and propidium monoazide for the specific detection of viable Listeria monocytogenes in milk products, with an internal amplification control. Food Control 2021. [DOI: 10.1016/j.foodcont.2021.107975] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
24
|
Roumani F, Azinheiro S, Sousa H, Sousa A, Timóteo M, Varandas T, Fonseca-Silva D, Baldaque I, Carvalho J, Prado M, Garrido-Maestu A. Optimization and Clinical Evaluation of a Multi-Target Loop-Mediated Isothermal Amplification Assay for the Detection of SARS-CoV-2 in Nasopharyngeal Samples. Viruses 2021; 13:940. [PMID: 34069710 PMCID: PMC8161362 DOI: 10.3390/v13050940] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/13/2021] [Accepted: 05/16/2021] [Indexed: 12/23/2022] Open
Abstract
SARS-CoV-2 is the coronavirus responsible for COVID-19, which has spread worldwide, affecting more than 200 countries, infecting over 140 million people in one year. The gold standard to identify infected people is RT-qPCR, which is highly sensitive, but needs specialized equipment and trained personnel. The demand for these reagents has caused shortages in certain countries. Isothermal nucleic acid techniques, such as loop-mediated isothermal amplification (LAMP) have emerged as an alternative or as a complement to RT-qPCR. In this study, we developed and evaluated a multi-target RT-LAMP for the detection of SARS-CoV-2. The method was evaluated against an RT-qPCR in 152 clinical nasopharyngeal swab samples. The results obtained indicated that both assays presented a "good concordance" (Cohen's k of 0.69), the RT-LAMP was highly specific (99%) but had lower sensitivity compared to the gold standard (63.3%). The calculated low sensitivity was associated with samples with very low viral load (RT-qPCR Cq values higher than 35) which may be associated with non-infectious individuals. If an internal Cq threshold below 35 was set, the sensitivity and Cohen's k increased to 90.9% and 0.92, respectively. The interpretation of the Cohen's k for this was "very good concordance". The RT-LAMP is an attractive approach for frequent individual testing in decentralized setups.
Collapse
Affiliation(s)
- Foteini Roumani
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (F.R.); (S.A.); (J.C.); (M.P.)
- Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Campus of Lugo, 27002 Lugo, Spain
| | - Sarah Azinheiro
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (F.R.); (S.A.); (J.C.); (M.P.)
- Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Campus of Lugo, 27002 Lugo, Spain
| | - Hugo Sousa
- Virology Service, Portuguese Oncology Institute of Porto, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal; (H.S.); (A.S.); (T.V.); (D.F.-S.); (I.B.)
- Molecular Oncology and Viral Pathology Group (CI-IPOP), Portuguese Oncology Institute of Porto, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal;
| | - Ana Sousa
- Virology Service, Portuguese Oncology Institute of Porto, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal; (H.S.); (A.S.); (T.V.); (D.F.-S.); (I.B.)
- Molecular Oncology and Viral Pathology Group (CI-IPOP), Portuguese Oncology Institute of Porto, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal;
| | - Mafalda Timóteo
- Molecular Oncology and Viral Pathology Group (CI-IPOP), Portuguese Oncology Institute of Porto, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal;
| | - Tatiana Varandas
- Virology Service, Portuguese Oncology Institute of Porto, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal; (H.S.); (A.S.); (T.V.); (D.F.-S.); (I.B.)
- Molecular Oncology and Viral Pathology Group (CI-IPOP), Portuguese Oncology Institute of Porto, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal;
| | - Daniela Fonseca-Silva
- Virology Service, Portuguese Oncology Institute of Porto, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal; (H.S.); (A.S.); (T.V.); (D.F.-S.); (I.B.)
| | - Inês Baldaque
- Virology Service, Portuguese Oncology Institute of Porto, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal; (H.S.); (A.S.); (T.V.); (D.F.-S.); (I.B.)
| | - Joana Carvalho
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (F.R.); (S.A.); (J.C.); (M.P.)
- Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Campus of Lugo, 27002 Lugo, Spain
| | - Marta Prado
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (F.R.); (S.A.); (J.C.); (M.P.)
| | - Alejandro Garrido-Maestu
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (F.R.); (S.A.); (J.C.); (M.P.)
| |
Collapse
|
25
|
Carvalho J, Garrido-Maestu A, Azinheiro S, Fuciños P, Barros-Velázquez J, De Miguel RJ, Gros V, Prado M. Faster monitoring of the invasive alien species (IAS) Dreissena polymorpha in river basins through isothermal amplification. Sci Rep 2021; 11:10175. [PMID: 33986380 PMCID: PMC8119715 DOI: 10.1038/s41598-021-89574-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Accepted: 04/28/2021] [Indexed: 11/25/2022] Open
Abstract
Zebra mussel (Dreissena polymorpha) is considered as one of the 100 most harmful IAS in the world. Traditional detection methods have limitations, and PCR based environmental DNA detection has provided interesting results for early warning. However, in the last years, the development of isothermal amplification methods has received increasing attention. Among them, loop-mediated isothermal amplification (LAMP) has several advantages, including its higher tolerance to the presence of inhibitors and the possibility of naked-eye detection, which enables and simplifies its potential use in decentralized settings. In the current study, a real-time LAMP (qLAMP) method for the detection of Dreissena polymorpha was developed and tested with samples from the Guadalquivir River basin, together with two real-time PCR (qPCR) methods using different detection chemistries, targeting a specific region of the mitochondrial gene cytochrome C oxidase subunit I. All three developed approaches were evaluated regarding specificity, sensitivity and time required for detection. Regarding sensitivity, both qPCR approaches were more sensitive than qLAMP by one order of magnitude, however the qLAMP method proved to be as specific and much faster being performed in just 9 min versus 23 and 29 min for the qPCR methods based on hydrolysis probe and intercalating dye respectively.
Collapse
Affiliation(s)
- Joana Carvalho
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal.,Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Alejandro Garrido-Maestu
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Sarah Azinheiro
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal.,Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Pablo Fuciños
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Jorge Barros-Velázquez
- Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Ramón J De Miguel
- Department of Zoology, University of Cordoba, Córdoba, Spain.,Guadalictio S.L., Córdoba, Spain
| | - Verónica Gros
- Confederación Hidrográfica del Guadalquivir, Ministerio para la Transición Ecológica y el Reto Demográfico, Sevilla, Spain
| | - Marta Prado
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory (INL), Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal.
| |
Collapse
|
26
|
Garrido-Maestu A, Azinheiro S, Roumani F, Carvalho J, Prado M. Application of Short Pre-enrichment, and Double Chemistry Real-Time PCR, Combining Fluorescent Probes and an Intercalating Dye, for Same-Day Detection and Confirmation of Salmonella spp. and Escherichia coli O157 in Ground Beef and Chicken Samples. Front Microbiol 2020; 11:591041. [PMID: 33162968 PMCID: PMC7581864 DOI: 10.3389/fmicb.2020.591041] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 09/22/2020] [Indexed: 11/13/2022] Open
Abstract
Molecular methods, particularly those based on real-time PCR (qPCR), have become a popular approach to detect pathogens in food samples. This technique may take advantage of hydrolysis fluorescent probes for increased specificity. Even though suitable, this approach loses the capacity of performing result confirmation by melt curve analysis. In the current study, we developed an alternative approach, combining fluorescent probes along with an intercalating dye (SYBR Green) in order to simultaneously detect, and confirm the result, of two foodborne pathogens (Salmonella spp. and Escherichia coli O157). This new approach named double chemistry qPCR was combined with a short pre-enrichment in order to obtain a multiplex “same-day” detection method for the selected pathogens. The evaluation of the novel method in spiked food samples (ground beef and chicken breast) obtained values of relative sensitivity, specificity, and accuracy higher than 95%, and Cohen’s kappa of 0.92, with a Limit of Detection95 below 5 cfu/25 g, demonstrating its reliability. In addition to this, the method was challenged by inoculating heat-stressed bacteria as well as dead ones. It was observed that it was also possible to detect stressed bacteria with an initial inoculation level below 10 cfu/25 g. Also, it was noticed that high initial concentration of either pathogen (higher than 104 cfu/25 g) was needed in order to generate false positive results due to the presence of dead bacteria, thus the method presents potential for its application in the specific detection of live microorganisms.
Collapse
Affiliation(s)
- Alejandro Garrido-Maestu
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
| | - Sarah Azinheiro
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal.,Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Foteini Roumani
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal.,Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Joana Carvalho
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal.,Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences, University of Santiago de Compostela, Santiago de Compostela, Spain
| | - Marta Prado
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
| |
Collapse
|
27
|
Freitas FMC, Cerqueira MA, Gonçalves C, Azinheiro S, Garrido-Maestu A, Vicente AA, Pastrana LM, Teixeira JA, Michelin M. Green synthesis of lignin nano- and micro-particles: Physicochemical characterization, bioactive properties and cytotoxicity assessment. Int J Biol Macromol 2020; 163:1798-1809. [PMID: 32961194 DOI: 10.1016/j.ijbiomac.2020.09.110] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 09/13/2020] [Accepted: 09/15/2020] [Indexed: 12/29/2022]
Abstract
Lignin particles (LPs) have gained prominence due to their biodegradability and bioactive properties. LP production at nano and micro scale produced from organosolv lignin and the understanding of size's effect on their properties is unexplored. This work aimed to produce and characterize lignin nanoparticles and microparticles using a green synthesis process, based on ethanol-solubilized lignin and water. Spherical shape LPs, with a mean size of 75 nm and 215 nm and with a low polydispersity were produced, as confirmed by transmission electron microscopy and dynamic light scattering. LPs thermal stability improved over raw lignin, and the chemical structure of lignin was not affected by the production method. The antimicrobial tests proved that LPs presented a bacteriostatic effect on Escherichiacoli and Salmonella enterica. Regarding the antioxidant potential, LPs had a good antioxidant activity that increased with the reaction time and LPs concentration. LPs also presented an antioxidant effect against intracellular ROS, reducing the intracellular ROS levels significantly. Furthermore, the LPs showed a low cytotoxic effect in Caco-2 cell line. These results showed that LPs at different scales (nano and micro) present biological properties and are safe to be used in different high value industrial sectors, such as biomedical, pharmaceutical and food.
Collapse
Affiliation(s)
- Filipa M C Freitas
- Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Miguel A Cerqueira
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | - Catarina Gonçalves
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | - Sarah Azinheiro
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | - António A Vicente
- Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Lorenzo M Pastrana
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, 4715-330 Braga, Portugal
| | - José A Teixeira
- Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Michele Michelin
- Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
| |
Collapse
|
28
|
Azinheiro S, Carvalho J, Prado M, Garrido-Maestu A. Multiplex Detection of Salmonella spp., E. coli O157 and L. monocytogenes by qPCR Melt Curve Analysis in Spiked Infant Formula. Microorganisms 2020; 8:microorganisms8091359. [PMID: 32899815 PMCID: PMC7564587 DOI: 10.3390/microorganisms8091359] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 09/02/2020] [Accepted: 09/03/2020] [Indexed: 01/23/2023] Open
Abstract
Food poisoning continue to be a threat in the food industry showing a need to improve the detection of the pathogen responsible for the hospitalization cases and death. DNA-based techniques represent a real advantage and allow the detection of several targets at the same time, reducing cost and time of analysis. The development of new methodology using SYBR Green qPCR for the detection of L. monocytogenes, Salmonella spp. and E. coli O157 simultaneously was developed and a non-competitive internal amplification control (NC-IAC) was implemented to detect reaction inhibition. The formulation and supplementation of the enrichment medium was also optimized to allow the growth of all pathogens. The limit of detection (LoD) 95% obtained was <1 CFU/25 g for E. coli O157, and 2 CFU/25 g for Salmonella spp. and L. monocytogenes and regarding the multiplex detection a LoD 95% of 1.7 CFU/25 g was observed. The specificity, relative sensitivity and accuracy of full methodology were 100% and the use of the NC-IAC allowed the reliability of the results without interfering with the sensitivity of the methodology. The described study proved to obtain results comparable to those of probe-based qPCR, and more economically than classical high resolution melting qPCR, being both important aspects for its implementation in the food industry.
Collapse
Affiliation(s)
- Sarah Azinheiro
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (S.A.); (J.C.); (M.P.)
- College of Pharmacy/School of Veterinary Sciences, University of Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain
| | - Joana Carvalho
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (S.A.); (J.C.); (M.P.)
- College of Pharmacy/School of Veterinary Sciences, University of Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain
| | - Marta Prado
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (S.A.); (J.C.); (M.P.)
| | - Alejandro Garrido-Maestu
- Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal; (S.A.); (J.C.); (M.P.)
- Correspondence:
| |
Collapse
|
29
|
Azinheiro S, Kant K, Shahbazi MA, Garrido-Maestu A, Prado M, Dieguez L. A smart microfluidic platform for rapid multiplexed detection of foodborne pathogens. Food Control 2020. [DOI: 10.1016/j.foodcont.2020.107242] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
30
|
Wu L, Teixeira A, Garrido-Maestu A, Muinelo-Romay L, Lima L, Santos LL, Prado M, Diéguez L. Profiling DNA mutation patterns by SERS fingerprinting for supervised cancer classification. Biosens Bioelectron 2020; 165:112392. [PMID: 32729513 DOI: 10.1016/j.bios.2020.112392] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 06/04/2020] [Accepted: 06/13/2020] [Indexed: 12/14/2022]
Abstract
Profiling DNA mutation patterns for cancer classification plays an essential role in precision and personalized medicine. Conventional PCR-based mutation assay is limited by the extensive labour on target amplification. We herein create an amplification-free surface enhanced Raman spectroscopy (SERS) biochip which enables direct and simultaneous identification of multiple point mutations in tumor cells. Without pre-amplifying the target sequences, the SERS assay reads out the presence of cellular mutations through the interpretation of Raman fingerprints. The SERS sensor is integrated into a microfluidic chip, achieving one-step multiplex analysis within 40 min. Importantly, by combining SERS spectra encoding technique with supervised learning algorithm, a panel of nucleotide mixtures can be well distinguished according to their mutation profiles. We initially demonstrate an excellent levels of classification in samples from colorectal cancer and melanoma cell lines. For final clinical validation, the system performance is verified by classifying cancer patient samples, which shows an accuracy above 90%. Due to the simplicity and rapidness, the SERS biosensor is expected to become a promising tool for clinical point-of-care diagnosis towards precision medicine.
Collapse
Affiliation(s)
- Lei Wu
- Medical Devices, International Iberian Nanotechnology Laboratory - INL, 4715-330 Braga, Portugal
| | - Alexandra Teixeira
- Medical Devices, International Iberian Nanotechnology Laboratory - INL, 4715-330 Braga, Portugal
| | - Alejandro Garrido-Maestu
- Food Quality and Safety, International Iberian Nanotechnology Laboratory - INL, 4715-330 Braga, Portugal
| | - Laura Muinelo-Romay
- Liquid Biopsy Analysis Unit, Oncomet, Health Research Institute of Santiago (IDIS), Complejo Hospitalario de Santiago de Compostela, Trav. Choupana s/n, 15706, Santiago de Compostela, Spain; CIBERONC, Centro de Investigación Biomédica en Red Cáncer Calle de Melchor Fernández Almagro, 3, 28029, Madrid, Spain
| | - Luis Lima
- Experimental Pathology and Therapeutics Group, Portuguese Institute of Oncology, R. Dr. António Bernardino de Almeida 865, 4200-072 Porto, Portugal; Glycobiology in Cancer, Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), R. Alfredo Allen 208, 4200-135 Porto, Portugal; Instituto de Investigação e Inovação em Saúde (I3S), University of Porto, R. Alfredo Allen 208, 4200-135 Porto, Portugal
| | - Lúcio Lara Santos
- Experimental Pathology and Therapeutics Group, Portuguese Institute of Oncology, R. Dr. António Bernardino de Almeida 865, 4200-072 Porto, Portugal; Health School of University Fernando Pessoa, Porto, Portugal; Department of Surgical Oncology, Portuguese Institute of Oncology, Porto, Portugal
| | - Marta Prado
- Food Quality and Safety, International Iberian Nanotechnology Laboratory - INL, 4715-330 Braga, Portugal
| | - Lorena Diéguez
- Medical Devices, International Iberian Nanotechnology Laboratory - INL, 4715-330 Braga, Portugal.
| |
Collapse
|
31
|
Garrido-Maestu A, Azinheiro S, Fuciños P, Carvalho J, Prado M. Comparative study of multiplex real-time recombinase polymerase amplification and ISO 11290-1 methods for the detection of Listeria monocytogenes in dairy products. Food Microbiol 2020; 92:103570. [PMID: 32950155 DOI: 10.1016/j.fm.2020.103570] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 06/09/2020] [Accepted: 06/09/2020] [Indexed: 01/12/2023]
Abstract
Dairy products have been implicated in foodborne infections caused by different bacterial pathogens. Among them, Listeria monocytogenes is of particular concern due to its ubiquity, resistance to sanitation processes and high mortality rates resulting from infection. These issues make the development of novel methods for the rapid detection of this bacterium of high interest. The evaluation of a novel multiplex real-time Recombinase Polymerase Amplification method including an internal amplification control is reported in the present work. The method performance was compared to that of the European reference method (ISO 11290-1) for the detection of the species in samples from 40 commercial products, including 14 UHT milk samples, 16 hard cheese samples, 6 infant dairy preparation samples and 4 fresh cheese samples. A limit of detection below 10 cfu/25 g or mL sample was achieved, and values higher than 90% were obtained for relative sensitivity, specificity, accuracy, positive and negative predictive values and the index (kappa) of concordance. Analysis was achieved within one working day, compared to the six days required using the ISO method. Moreover, slight modification of the ISO 11290-1 method to include secondary enrichment in half Fraser broth resulted in the confirmation of all positive samples.
Collapse
Affiliation(s)
- Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal.
| | - Sarah Azinheiro
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Pablo Fuciños
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Joana Carvalho
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Marta Prado
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| |
Collapse
|
32
|
Garrido-Maestu A, Azinheiro S, Carvalho J, Espiña B, Prado M. Evaluation and implementation of commercial antibodies for improved nanoparticle-based immunomagnetic separation and real-time PCR for faster detection of Listeria monocytogenes. J Food Sci Technol 2020; 57:4143-4151. [PMID: 33071335 DOI: 10.1007/s13197-020-04450-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 04/06/2020] [Accepted: 04/15/2020] [Indexed: 12/15/2022]
Abstract
L. monocytogenes continues to be a major health issue in Europe, as well as worldwide. Faster methods, not only for detection, but also for sample preparation are of great interest particularly for this slow-growing pathogen. Immunomagnetic separation has been previously reported to be an effective way to concentrate bacteria, and remove inhibitors. In the present study, different commercial antibodies were evaluated to select the most appropriate one, in order to develop a highly specific method. Additionally, magnetic nanoparticles, instead of microparticles, were selected due to their reported advantages (higher surface-volume ration and faster kinetics). Finally, the separation protocol, with a calculated capture efficiency of 95%, was combined with real-time PCR for highly sensitive detection of the concentrated bacteria. The optimized IMS-qPCR allowed to reduce hands-on time in the sample treatment, without affecting the overall performance of the method as a very low limit of detection was still obtained (9.7 CFU/ 25 g) with values for sensitivity, specificity, accuracy, positive and negative predictive values of 100%, resulting in a kappa index of concordance of 1.00. These results were obtained in spiked food samples of different types (chicken, fish, milk, hard and fresh cheese), further demonstrating the applicability of the optimized methodology presented.
Collapse
Affiliation(s)
- Alejandro Garrido-Maestu
- Department of Life Sciences, Nano4Food - Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
| | - Sarah Azinheiro
- Department of Life Sciences, Nano4Food - Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
| | - Joana Carvalho
- Department of Life Sciences, Nano4Food - Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
| | - Begoña Espiña
- Department of Life Sciences, Nano4Food - Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
| | - Marta Prado
- Department of Life Sciences, Nano4Food - Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
| |
Collapse
|
33
|
Teixeira A, Paris JL, Roumani F, Diéguez L, Prado M, Espiña B, Abalde-Cela S, Garrido-Maestu A, Rodriguez-Lorenzo L. Multifuntional Gold Nanoparticles for the SERS Detection of Pathogens Combined with a LAMP-in-Microdroplets Approach. Materials (Basel) 2020; 13:ma13081934. [PMID: 32325992 DOI: 10.1021/acsanm.9b01223] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 04/16/2020] [Accepted: 04/17/2020] [Indexed: 05/25/2023]
Abstract
We developed a droplet-based optofluidic system for the detection of foodborne pathogens. Specifically, the loop-mediated isothermal amplification (LAMP) technique was combined with surface-enhanced Raman scattering (SERS), which offers an excellent method for DNA ultradetection. However, the direct SERS detection of DNA compromises the simplicity of data interpretation due to the variability of its SERS fingerprints. Therefore, we designed an indirect SERS detection method using multifunctional gold nanoparticles (AuNPs) based on the formation of pyrophosphate generated during the DNA amplification by LAMP. Towards this goal, we prepared multifunctional AuNPs involving three components with key roles: (1) thiolated poly(ethylene glycol) as stabilizing agent, (2) 1-naphthalenethiol as Raman reporter, and (3) glutathione as a bioinspired chelating agent of magnesium (II) ions. Thus, the variation in the SERS signal of 1-naphthalenethiol was controlled by the aggregation of AuNPs triggered by the complexation of pyrophosphate and glutathione with free magnesium ions. Using this strategy, we detected Listeria monocytogenes, not only in buffer, but also in a food matrix (i.e., ultra-high temperaturemilk) enabled by the massive production of hotspots as a result of the self-assemblies that enhanced the SERS signal. This allowed the development of a microdroplet-LAMP-SERS platform with isothermal amplification and real-time identification capabilities.
Collapse
Affiliation(s)
- Alexandra Teixeira
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal
| | - Juan L Paris
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal
| | - Foteini Roumani
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal
| | - Lorena Diéguez
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal
| | - Marta Prado
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal
| | - Begoña Espiña
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal
| | - Sara Abalde-Cela
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal
| | - Laura Rodriguez-Lorenzo
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal
| |
Collapse
|
34
|
Teixeira A, Paris JL, Roumani F, Diéguez L, Prado M, Espiña B, Abalde-Cela S, Garrido-Maestu A, Rodriguez-Lorenzo L. Multifuntional Gold Nanoparticles for the SERS Detection of Pathogens Combined with a LAMP-in-Microdroplets Approach. Materials (Basel) 2020; 13:E1934. [PMID: 32325992 PMCID: PMC7215531 DOI: 10.3390/ma13081934] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 04/16/2020] [Accepted: 04/17/2020] [Indexed: 12/31/2022]
Abstract
We developed a droplet-based optofluidic system for the detection of foodborne pathogens. Specifically, the loop-mediated isothermal amplification (LAMP) technique was combined with surface-enhanced Raman scattering (SERS), which offers an excellent method for DNA ultradetection. However, the direct SERS detection of DNA compromises the simplicity of data interpretation due to the variability of its SERS fingerprints. Therefore, we designed an indirect SERS detection method using multifunctional gold nanoparticles (AuNPs) based on the formation of pyrophosphate generated during the DNA amplification by LAMP. Towards this goal, we prepared multifunctional AuNPs involving three components with key roles: (1) thiolated poly(ethylene glycol) as stabilizing agent, (2) 1-naphthalenethiol as Raman reporter, and (3) glutathione as a bioinspired chelating agent of magnesium (II) ions. Thus, the variation in the SERS signal of 1-naphthalenethiol was controlled by the aggregation of AuNPs triggered by the complexation of pyrophosphate and glutathione with free magnesium ions. Using this strategy, we detected Listeria monocytogenes, not only in buffer, but also in a food matrix (i.e., ultra-high temperaturemilk) enabled by the massive production of hotspots as a result of the self-assemblies that enhanced the SERS signal. This allowed the development of a microdroplet-LAMP-SERS platform with isothermal amplification and real-time identification capabilities.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | - Laura Rodriguez-Lorenzo
- International Iberian Nanotechnology Laboratory (INL), Avda Mestre José Veiga, 4715-310 Braga, Portugal; (A.T.); (J.L.P.); (F.R.); (L.D.); (M.P.); (B.E.); (S.A.-C.); (A.G.-M.)
| |
Collapse
|
35
|
Garrido-Maestu A, Azinheiro S, Carvalho J, Prado M. Combination of Immunomagnetic Separation and Real-Time Recombinase Polymerase Amplification (IMS-qRPA) for Specific Detection of Listeria monocytogenes in Smoked Salmon Samples. J Food Sci 2019; 84:1881-1887. [PMID: 31264719 DOI: 10.1111/1750-3841.14662] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 04/18/2019] [Accepted: 04/23/2019] [Indexed: 01/24/2023]
Abstract
Nowadays, Listeria monocytogenes continues to be a major health issue. Therefore, improvements in the speed and reliability of its detection are still needed. In the present study, the combination of real-time Recombinase Polymerase Amplification (qRPA) with immunomagnetic separation (IMS) is described. The proposed methodology was tested against a real-time PCR method, and was successfully applied to 50 smoked salmon samples spiked at levels ranging from 2 to 9.3 × 102 cfu/25 g. L. monocytogenes was detected after a 24 hr pre-enrichment, which represents a great improvement over other previously published RPA methods. Additionally, the evaluation of the method reported a Limit of dDetection 50 (LoD50 ) of 6.3 cfu/25 g, along with relative sensitivity, specificity and accuracy values higher than 90%. Finally, the index of kappa concordance was calculated to be 0.93 which is interpreted as "almost complete concordance" between the reference and alternative method. Overall, the described methodology proved to be faster, specific, and as sensitive as other methods based on RPA or real-time PCR. PRACTICAL APPLICATION: The methodology described in this study significantly reduces the detection time of L. monocytogenes, when compared with culture-based methods, and it requires fewer steps than other molecular methods, making it a reliable and more convenient method for routine testing. Finally, the evaluation of the methodology in spiked food samples, confirms its reliability.
Collapse
Affiliation(s)
- Alejandro Garrido-Maestu
- Dept. of Life Sciences, Food Quality and Safety Research Group, Intl. Iberian Nanotechnology Lab., Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Sarah Azinheiro
- Dept. of Life Sciences, Food Quality and Safety Research Group, Intl. Iberian Nanotechnology Lab., Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Joana Carvalho
- Dept. of Life Sciences, Food Quality and Safety Research Group, Intl. Iberian Nanotechnology Lab., Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| | - Marta Prado
- Dept. of Life Sciences, Food Quality and Safety Research Group, Intl. Iberian Nanotechnology Lab., Av. Mestre José Veiga s/n, 4715-330, Braga, Portugal
| |
Collapse
|
36
|
Garrido-Maestu A, Fuciños P, Azinheiro S, Carvalho C, Carvalho J, Prado M. Specific detection of viable Salmonella Enteritidis by phage amplification combined with qPCR (PAA-qPCR) in spiked chicken meat samples. Food Control 2019. [DOI: 10.1016/j.foodcont.2018.12.038] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
37
|
Wu L, Garrido-Maestu A, Guerreiro JRL, Carvalho S, Abalde-Cela S, Prado M, Diéguez L. Amplification-free SERS analysis of DNA mutation in cancer cells with single-base sensitivity. Nanoscale 2019; 11:7781-7789. [PMID: 30951061 DOI: 10.1039/c9nr00501c] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Accurate and sensitive identification of DNA mutations in tumor cells is critical to the diagnosis, prognosis and personalized therapy of cancer. Conventional polymerase chain reaction (PCR)-based methods are limited by the complicated amplification process. Herein, an amplification-free surface enhanced Raman spectroscopy (SERS) approach which directly detects point mutations in cancer cells has been proposed. A highly sensitive and uniform SERS substrate was fabricated using gold@silver core-shell nanorods, achieving an enhancement factor of 1.85 × 106. By combining the SERS-active nanosubstrate with molecular beacon probes, the limit of detection reached as low as 50 fM. To enable parallel analysis and automated operation, the SERS sensor was integrated into a microfluidic chip. This novel chip-based assay was able to differentiate between mutated and wild-type KRAS genes among a variety of other nucleic acids from cancer cells in 40 min. Owing to the simple operation and fast analysis, the SERS-based DNA assay chip could potentially provide insights into clinical cancer theranostics in an easy and inexpensive manner at the point of care.
Collapse
Affiliation(s)
- Lei Wu
- International Iberian Nanotechnology Laboratory (INL), 4715-330 Braga, Portugal.
| | | | | | | | | | | | | |
Collapse
|
38
|
Garrido-Maestu A, Tomás Fornés D, Prado Rodríguez M. The Use of Multiplex Real-Time PCR for the Simultaneous Detection of Foodborne Bacterial Pathogens. Methods Mol Biol 2019; 1918:35-45. [PMID: 30580397 DOI: 10.1007/978-1-4939-9000-9_3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Foodborne pathogens continue to be a major health issue worldwide. Culture-dependent methodologies are still considered the gold-standard to perform pathogen detection and quantification. These methods present several drawbacks, such as being time-consuming and labor-intensive. The implementation of real-time PCR has allowed to overcome these limitations and even reduce costs associated with the analyses, due to the possibility of simultaneously and accurately detecting several pathogens in one single assay, with results comparable to those obtained by classical approaches. In this chapter a protocol for the simultaneous detection of two of the most important foodborne pathogens, Salmonella spp. and Listeria monocytogenes, is described.
Collapse
Affiliation(s)
- Alejandro Garrido-Maestu
- Department of Life Sciences, Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal.
| | - David Tomás Fornés
- Nestlé Research Center, Institute Food Safety and Analytical Science, Microbial and Molecular Analytics Group, Lausanne, Switzerland
| | - Marta Prado Rodríguez
- Department of Life Sciences, Food Quality and Safety Research Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
| |
Collapse
|
39
|
Carvalho J, Negrinho R, Azinheiro S, Garrido-Maestu A, Barros-Velázquez J, Prado M. Data on minute DNA quantification on microvolumetric solutions: comparison of mathematical models and effect of some compounds on the DNA quantification accuracy. Data Brief 2018; 21:424-431. [PMID: 30364793 PMCID: PMC6198060 DOI: 10.1016/j.dib.2018.09.098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Revised: 09/18/2018] [Accepted: 09/30/2018] [Indexed: 11/28/2022] Open
Abstract
This article contains data related to the research article entitled "Novel approach for accurate minute DNA quantification on microvolumetric solutions" (Carvalho et al., 2018). The combination of PicoGreen® with a microvolume fluorospectrometer is a popular DNA quantification method due to its high sensitivity and minimal consumption of sample, being commonly used to evaluate the performance of microfluidic devices designed for DNA purification. In this study, the authors present data related with the effect of DNA fragmentation level. The present data article includes the data used on the precision evaluation, in terms of repeatability, of the mathematical models developed to obtain the standards curve for salmon sperm DNA (low molecular weight). In addition, results related with the effect of some compounds on the DNA quantification accuracy using λDNA are presented.
Collapse
Affiliation(s)
- Joana Carvalho
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
| | - Renato Negrinho
- Machine Learning Department, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Sarah Azinheiro
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
| | - Alejandro Garrido-Maestu
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
| | - Jorge Barros-Velázquez
- Department of Analytical Chemistry, Nutrition and Food Science, School of Veterinary Sciences/College of Biotechnology, University of Santiago de Compostela, Campus Lugo, Lugo, Spain
| | - Marta Prado
- International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga s/n, 4715-330 Braga, Portugal
| |
Collapse
|
40
|
Garrido-Maestu A, Ma Z, Paik SYR, Chen N, Ko S, Tong Z, Jeong KC. Engineering of chitosan-derived nanoparticles to enhance antimicrobial activity against foodborne pathogen Escherichia coli O157:H7. Carbohydr Polym 2018; 197:623-630. [DOI: 10.1016/j.carbpol.2018.06.046] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 06/10/2018] [Accepted: 06/11/2018] [Indexed: 10/14/2022]
|
41
|
Carvalho J, Negrinho R, Azinheiro S, Garrido-Maestu A, Barros-Velázquez J, Prado M. Novel approach for accurate minute DNA quantification on microvolumetric solutions. Microchem J 2018. [DOI: 10.1016/j.microc.2018.02.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
42
|
Garrido-Maestu A, Azinheiro S, Carvalho J, Fuciños P, Prado M. Development and evaluation of loop-mediated isothermal amplification, and Recombinase Polymerase Amplification methodologies, for the detection of Listeria monocytogenes in ready-to-eat food samples. Food Control 2018. [DOI: 10.1016/j.foodcont.2017.11.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
43
|
Azinheiro S, Carvalho J, Prado M, Garrido-Maestu A. Evaluation of Different Genetic Targets for Salmonella enterica Serovar Enteriditis and Typhimurium, Using Loop-Mediated Isothermal AMPlification for Detection in Food Samples. Front Sustain Food Syst 2018. [DOI: 10.3389/fsufs.2018.00005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
|
44
|
Ma Z, Garrido-Maestu A, Lee C, Chon J, Jeong D, Yue Y, Sung K, Park Y, Jeong KC. Comprehensive in vitro and in vivo risk assessments of chitosan microparticles using human epithelial cells and Caenorhabditis elegans. J Hazard Mater 2018; 341:248-256. [PMID: 28797941 DOI: 10.1016/j.jhazmat.2017.07.071] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Revised: 07/18/2017] [Accepted: 07/31/2017] [Indexed: 06/07/2023]
Abstract
The safety of using nano- and microparticles is a developing concern. In this study, we conducted risk assessments of chitosan microparticles (CMs) using in vitro human epithelial cell lines and in vivo animal model, Caenorhabditis elegans. After engineering of various CMs, we screened four CMs based on antimicrobial activity, which is a potential usage for disease treatment caused by multidrug resistant bacteria, and evaluated for risk assessments. CMs, with strong antimicrobial activity, and inorganic nanoparticles (SiO2, TiO2, and ZnO) did not cause toxicity in human cells measured by cell membrane integrity, mitochondria activity, and reactive oxygen species concentration. However, when applied to C. elegans, only CMs generated with low molecular weight chitosan and tripolyphosphate at 0.1% did not affect the lifespan, while the other CMs and inorganic nanoparticles shortened the lifespan, suggesting that they may cause subtle toxicity. These results suggest that C. elegans could be a sensitive animal model to measure low level of toxicity of nano- and microparticles. Taken together, although CMs do not cause toxicity at working concentrations of antimicrobial activity in human epithelial cells, they may cause toxicity at high concentration, suggesting that nano- and microparicles should be thoroughly investigated before they are applied.
Collapse
Affiliation(s)
- Zhengxin Ma
- Emerging Pathogens Institute, University of Florida, Gainesville, FL 32611, United States; Department of Animal Sciences, University of Florida, Gainesville, FL 32611, United States
| | - Alejandro Garrido-Maestu
- Emerging Pathogens Institute, University of Florida, Gainesville, FL 32611, United States; Department of Animal Sciences, University of Florida, Gainesville, FL 32611, United States
| | - Choonghee Lee
- Emerging Pathogens Institute, University of Florida, Gainesville, FL 32611, United States; Department of Animal Sciences, University of Florida, Gainesville, FL 32611, United States
| | - Jungwhan Chon
- Division of Microbiology, National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR 72079, United States
| | - Daehee Jeong
- F. W. Buchholz High School, Gainesville, FL 32606, United States
| | - Yiren Yue
- Department of Food Science, University of Massachusetts, Amherst, MA 01002, United States
| | - Kidon Sung
- Division of Microbiology, National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR 72079, United States
| | - Yeonhwa Park
- Department of Food Science, University of Massachusetts, Amherst, MA 01002, United States
| | - Kwangcheol Casey Jeong
- Emerging Pathogens Institute, University of Florida, Gainesville, FL 32611, United States; Department of Animal Sciences, University of Florida, Gainesville, FL 32611, United States.
| |
Collapse
|
45
|
Garrido-Maestu A, Azinheiro S, Carvalho J, Abalde-Cela S, Carbó-Argibay E, Diéguez L, Piotrowski M, Kolen’ko YV, Prado M. Combination of Microfluidic Loop-Mediated Isothermal Amplification with Gold Nanoparticles for Rapid Detection of Salmonella spp. in Food Samples. Front Microbiol 2017; 8:2159. [PMID: 29209283 PMCID: PMC5701617 DOI: 10.3389/fmicb.2017.02159] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 10/20/2017] [Indexed: 11/16/2022] Open
Abstract
Foodborne diseases are an important cause of morbidity and mortality. According to the World Health Organization, there are 31 main global hazards, which caused in 2010 600 million foodborne illnesses and 420000 deaths. Among them, Salmonella spp. is one of the most important human pathogens, accounting for more than 90000 cases in Europe and even more in the United States per year. In the current study we report the development, and thorough evaluation in food samples, of a microfluidic system combining loop-mediated isothermal amplification with gold nanoparticles (AuNPs). This system is intended for low-cost, in situ, detection of different pathogens, as the proposed methodology can be extrapolated to different microorganisms. A very low limit of detection (10 cfu/25 g) was obtained. Furthermore, the evaluation of spiked food samples (chicken, turkey, egg products), completely matched the expected results, as denoted by the index kappa of concordance (value of 1.00). The results obtained for the relative sensitivity, specificity and accuracy were of 100% as well as the positive and negative predictive values.
Collapse
|
46
|
Ma Z, Garrido-Maestu A, Jeong KC. Application, mode of action, and in vivo activity of chitosan and its micro- and nanoparticles as antimicrobial agents: A review. Carbohydr Polym 2017; 176:257-265. [DOI: 10.1016/j.carbpol.2017.08.082] [Citation(s) in RCA: 155] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Revised: 07/28/2017] [Accepted: 08/18/2017] [Indexed: 01/22/2023]
|
47
|
Garrido-Maestu A, Fuciños P, Azinheiro S, Carvalho J, Prado M. Systematic loop-mediated isothermal amplification assays for rapid detection and characterization of Salmonella spp., Enteritidis and Typhimurium in food samples. Food Control 2017. [DOI: 10.1016/j.foodcont.2017.05.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
48
|
Rodriguez-Souto RR, Garrido-Maestu A, Pastoriza-Fontan A, Lozano-Leon A. Investigation and characterization of Shiga toxin-producingEscherichia colipresent in mussels from harvesting areas in Galician southern Rias (NW Spain). J Food Saf 2017. [DOI: 10.1111/jfs.12367] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Alejandro Garrido-Maestu
- Department of Life Sciences, International Iberian Nanotechnology Laboratory, Nano4Food Unit; Food Quality and Safety Research Group, Av. Mestre José Veiga s/n 4715-330 Braga; Portugal
| | | | - Antonio Lozano-Leon
- Institute of Applied Microbiology - ASMECRUZ. Playa de Beluso s/n, Bueu PO 36939; Spain
| |
Collapse
|
49
|
Garrido-Maestu A, Lozano-León A, Rodríguez-Souto RR, Vieites-Maneiro R, Chapela MJ, Cabado AG. Presence of pathogenic Vibrio species in fresh mussels harvested in the southern Rias of Galicia (NW Spain). Food Control 2016. [DOI: 10.1016/j.foodcont.2015.06.054] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
50
|
Garrido-Maestu A, Chapela MJ, Peñaranda E, Cabado AG. Re-evaluation of Enhanced qPCR Prevalidated Method for Next-day Detection ofSalmonellaspp.,Shigellaspp.,Escherichia coliO157 andListeria monocytogenes. FOOD BIOTECHNOL 2015. [DOI: 10.1080/08905436.2015.1091977] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|