Home > Catalogo generale > Culture media and ISO confirmation tests > Palcam Agar – terreno selettivo per l’isolamento di Listeria a norma ISO11290

Palcam Agar – terreno selettivo per l’isolamento di Listeria a norma ISO11290

  • Brand: Bio-Rad
  • Format: 500 g
  • Code: BR3564754
  • Technology: Culture media and ISO confirmation tests
  • Application: Food/Water microbiology
  • Tag/Filter: Listeria

The Palcam medium is used as a selective isolation medium for the detection of Listeria spp. in food products according to ISO11290. Due to the combined action of lithium chloride and the selective supplement, this medium inhibits non-Listeria flora. On this medium, at 37°C, in 24 hours Listeria spp. Form shiny gray or gray-green colonies of about 1 mm diameter, surrounded by a brown-black halo (esculin hydrolysis). After 48 hours incubation, typical colonies with a diameter of approximately 2 mm are encrusted in the agar and present a central depression. Palcam medium also contains a mixture of mannitol and Phenol red which makes it possible to distinguish between colonies formed by Listeria spp. and colonies formed by non-inhibited esculin-positive Enterococcus. Unlike Listeria (other than L.grayi and L.murrayi), Enterococcus metabolizes mannitol. The acidification resulting from this metabolization causes the pH indicator to change (yellow haloes around the colonies). The medium is available as powder to be supplemented.


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Palcam Agar – terreno selettivo per l’isolamento di Listeria a norma ISO11290
  • Brand: Bio-Rad
  • Format: 500 g
  • Code: BR3564754
  • Technology: Culture media and ISO confirmation tests
  • Application: Food/Water microbiology
  • Tag/Filter: Listeria


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