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Comparison of Four Commercial DNA Extraction Kits for PCR...

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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.

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.

Journal Title: Journal of food protection.
Journal Volume/Issue: 2008 Oct., v. 71, no. 10
Main Author: ElizaquĆ­vel, P.
Other Authors: Aznar, R.
Format: Article
Language: English
Subjects: DNA
extraction
polymerase chain reaction
microbial detection
Listeria monocytogenes
Salmonella
Escherichia coli O157:H7
Staphylococcus aureus
analytical kits
raw vegetables
minimally processed foods
sweet peppers
broccoli
onions
food pathogens
food contamination
bacterial contamination
food analysis
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