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RESEARCH PRODUCT
Comparison of Four Commercial DNA Extraction Kits for PCR Detection of Listeria monocytogenes, Salmonella, Escherichia coli O157:H7, and Staphylococcus aureus in Fresh, Minimally Processed Vegetables
Rosa AznarRosa AznarPatricia Elizaquívelsubject
DNA BacterialStaphylococcus aureusSalmonellaColony Count MicrobialFood ContaminationBiologyEscherichia coli O157medicine.disease_causePolymerase Chain ReactionSensitivity and SpecificityMicrobiologyMicrobiologylaw.inventionListeria monocytogenesSalmonellalawVegetablesmedicineHumansFood microbiologyEscherichia coliPolymerase chain reactionReproducibility of Resultsfood and beveragesbiology.organism_classificationListeria monocytogenesEnterobacteriaceaeDNA extractionStaphylococcus aureusFood MicrobiologyFood Sciencedescription
Four commercial DNA extraction methods, PrepMan Ultra (Applied Biosystems), InstaGene Matrix (BioRad), DNeasy Tissue kit (Qiagen), and UltraClean (MoBio), were tested for PCR detection of Listeria monocytogenes, Escherichia coli O157: H7, Salmonella, and Staphylococcus aureus in fresh, minimally processed vegetables. For comparative purposes, sensitivity assays with specific PCRs were carried out after DNA extraction with the four methods in green pepper, broccoli, and onion artificially inoculated with the four pathogens separately. As confirmed by statistical analysis, the DNeasy Tissue kit rendered the highest sensitivity values in the three matrices assayed for Salmonella, L. monocytogenes, and E. coli O157:H7 and in onion for S. aureus. Despite being the most expensive of the methods compared, the DNeasy Tissue Kit can be successfully applied for any of the four most commonly studied pathogens, thus saving time and overall reducing the cost of the analysis.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-10-23 | Journal of Food Protection |