For real-time PCR detection of listeria subspecies in food or animal feed

  • Highly sensitive and specific detection of listeria DNA
  • Streamlined detection protocol
  • Dedicated mericon bacterial DNA isolation kits available
  • PCR run time of 73 minutes on the QIAGEN Rotor-Gene Q
  • Full license for PCR without additional costs
The mericon Listeria spp Kit is designed for the target-specific detection of Listeria species DNA in food, animal feed, and pharmaceutical products. The assay uses a real-time PCR-based protocol and forms part of the comprehensive QIAGEN food testing portfolio, which also features dedicated sample preparation kits and assays for ingredient authentication and GMO DNA detection. The mericon Listeria spp assay performs optimally on the Rotor-Gene Q, but has also been validated for block thermal cyclers.
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mericon Listeria spp Kit (24)
For 24 reactions: PCR Assay Listeria spp, Internal Control, Positive Control, Multiplex PCR Master Mix, QuantiTect Nucleic Acid Dilution Buffer, RNase-free water, 50x ROX Dye Solution
290123
Inquire
 
mericon Listeria spp Kit (96)
For 96 reactions: PCR Assay Listeria spp, Internal Control, Positive Control, Multiplex PCR Master Mix, QuantiTect Nucleic Acid Dilution Buffer, RNase-free water, 50x ROX Dye Solution
290125
Inquire

The mericon Listeria spp Kit is intended for molecular biology applications in food, animal feed, and pharmaceutical product testing. This product is not intended for the diagnosis, prevention, or treatment of a disease.
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Performance

The mericon Listeria spp Kit is for the specific detection of several Listeria species in enrichment cultures of food and animal feed samples. The assay can detect as few as 10 copies of listeria DNA in a reaction and it exhibits high specificity for pathogens of this genus. In an experiment using 2500 copies of the tested DNA, no cross-reactivity was observed with other pathogens (see the table "Results of mericon Listeria spp Kit cross-reactivity study").

Results of mericon Listeria spp Kit cross-reactivity study

 Pathogen  Result  Pathogen  Result
 Listeria monocytogenes  +  Listeria innocua  +
 Listeria welshimeri  +  Listeria marthii  +
 Listeria seeligeri  +  Listeria grayi  +
 Listeria ivanovii  +  Bacillus cereus  –
 Listeria rocourtiae  –  Yersinia enterocolitica  –
 Campylobacter jejuni  –  Clostridium perfringens  –
 Escherichia coli  –  Legionella erythra  –
 Cronobacter sakazakii  –  Shigella flexneri  –
 Legionella pneumophila  –  VTEC stx1/stx2  –
 Staphylococcus aureus  –  Salmonella abony  –

Principle

The mericon Listeria spp Kit is designed for the qualitative detection of several Listeria species in food and animal feed samples after enrichment. Compared with most other bacteria, listeria are able to grow under extreme environmental conditions, such as subzero temperatures or in alkaline conditions.

Detection of pathogens using real-time PCR is based on the amplification of a specific region of the relevant pathogen genome. The amplified product is detected using target-specific fluorescent probes that bind to it. As the PCR product accumulates, there is an increased fluorescent signal from the bound probes. Monitoring the fluorescence intensities during the PCR run (i.e., in real time) allows the detection of the accumulating PCR product without having to re-open the reaction tubes afterward.

mericon PCR Assays include an internal control to control potential inhibition. This aids in the straightforward interpretation of the results (see the table "Summary of possible PCR outcomes").

The PCR primer set for each assay is highly specific and targets a unique and conserved region of the tested pathogen genome that has been bioinformatically and experimentally verified.

Summary of possible PCR outcomes
Internal control amplifiedTested DNA amplified Meaning
+ + Sample is positive for the target DNA
+ Sample is negative for the target DNA
PCR failed due to inhibition
Procedure

DNA is extracted from an enrichment culture of a sample of food or animal feed using a dedicated sample preparation kit. The mericon Bacteria Kit is for the isolation of bacterial DNA from Gram-negative bacteria. The mericon Bacteria Plus Kit is for the isolation of bacterial DNA from Gram-positive bacteria.

The isolated, pure bacterial DNA is assayed using a streamlined real-time PCR protocol that returns results in 73 minutes on QIAGEN's Rotor-Gene Q. The protocol has also been validated for use on other thermal block cyclers.

The results are displayed as easy-to-interpret PCR curves.

Applications
The mericon Listeria spp Kit is for real-time PCR-based detection of Listeria species in food, animal feed, and pharmaceutical products.
Feature
Specifications
Quantitative/qualitative Qualitative
Recommended sample prep mericon DNA Bacteria Kit (Gram-negative bacteria) or mericon DNA Bacteria Plus Kit (Gram-positive bacteria)
RUO/CE/ASR RUO
Sample type Bacterial preculture from food
Thermal cycler Rotor-Gene Q and other cyclers
What detected DNA of respective pathogen

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