LISTERIA ENVIRONMENTAL ANALYSIS
3M™ Petrifilm™ Environmental Listeria Plates detect the presence of Listeria in environmental samples. A sample-ready culture medium containing selective agents, nutrients a cold water-soluble gelling agent and a chromogenic indicator.
Petrifilm™ EL plates are designed to analyse environmental samples and to help increase the efficiency of monitoring plant sanitation. The presence of indicator Listeria such as Listeria innocua provides evidence that environmental conditions are suitable for the occurence of Listeria monocytogenes. The Petrifilm™ EL plates detects the majority of environmental Listeria consisting of L. monocytogenese, L. innocua and L. welshimeri.
Many organisms in the environment can be stressed by environmental conditions or sanitisers. Buffered peptone water (BPW) is used as a repair broth in conjunction with the Petrifilm EL plate to resuscitate stressed Listeria without increasing their numbers. Repair in BPW is not an enrichemnt step.
Listeria spp grow on the Petrifilm™ Environmental Listeria Plates as red violet colonies.
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