title: Evaluation of applied biosystems MicroSEQ real-time PCR system for detection of Listeria spp. in food and environmental samples.
abstract: A complete system for real-time PCR detection of Listeria species was validated in five food matrixes and five environmental surfaces, namely, hot dogs, roast beef, lox (smoked salmon), pasteurized whole cow's milk, dry infant formula, stainless steel, plastic cutting board, ceramic tile, rubber sheets, and sealed concrete. The system consists of the MicroSEQ Listeria spp. Detection Kit, two sample preparation kits (PrepSEQ Nucleic Acid Extraction Kit and PrepSEQ Rapid Spin Sample Preparation Kit), the Applied Biosystems 7500 Fast Real-Time PCR instrument, and the RapidFinderTM Express v1.1 Software for data analysis. The test method was compared to the ISO 11290-1 reference method using an unpaired study design. The MicroSEQ Listeria spp. Detection Kit and the ISO 11290-1 reference method showed equivalent detection based on Chi-square analysis for all matrixes except hot dogs. For hot dogs, the MicroSEQ method detected more positives than the reference method for the low- and high-level inoculations, with all of the presumptive positives confirmed by the reference method. An independent validation study confirmed these findings on lox and stainless steel surface. The MicroSEQ kit detected all 50 Listeria strains tested and none of the 31 nontarget bacteria strains.
authors.affiliation: Life Technologies Corp., 850 Lincoln Centre Dr, Foster City, CA 94404, USA.
authors.forename: Olga V
authors.initials: OV
authors.lastname: Petrauskene
authors.forename: Yanxiang
authors.initials: Y
authors.lastname: Cao
authors.forename: Patrick
authors.initials: P
authors.lastname: Zoder
authors.forename: Lily Y
authors.initials: LY
authors.lastname: Wong
authors.forename: Priya
authors.initials: P
authors.lastname: Balachandran
authors.forename: Manohar R
authors.initials: MR
authors.lastname: Furtado
authors.forename: Robert S
authors.initials: RS
authors.lastname: Tebbs
mesh_terms: D000818:Animals; D002417:Cattle; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D004777:Environment; D004784:Environmental Monitoring / Q000379:methods*; D005504:Food Analysis / Q000379:methods; D005506:Food Contamination / Q000032:analysis*; D005516:Food Microbiology; D006801:Humans; D041943:Infant Formula; D007231:Infant, Newborn; D008087:Listeria / Q000235:genetics*; D008089:Listeria monocytogenes / Q000235:genetics*; D008460:Meat / Q000382:microbiology; D008892:Milk / Q000382:microbiology; D011933:Reagent Kits, Diagnostic; D060888:Real-Time Polymerase Chain Reaction / Q000379:methods*; D015203:Reproducibility of Results; D013045:Species Specificity
chemical_list: D011933:Reagent Kits, Diagnostic