Home > Catalogo generale > Culture media and ISO confirmation tests > VRBL (Violet Red Bile Lactose) Agar – terreno selettivo per il conteggio dei coliformi negli alimenti a norma ISO4832

VRBL (Violet Red Bile Lactose) Agar – terreno selettivo per il conteggio dei coliformi negli alimenti a norma ISO4832

  • Brand: Bio-Rad
  • Format: 6 x 200 ml
  • Code: BR3554798
  • Technology: Culture media and ISO confirmation tests
  • Application: Food/Water microbiology
  • Tag/Filter: Escherichia coli and coliforms

VRBL is a selective medium used for the enumeration of coliforms and thermotolerant coliforms in food products according to norm ISO4832. The principle of the medium relies on the ability of coliforms to ferment lactose. Due to the simultaneous presence of crystal violet and bile salts, the medium inhibits Gram-positive bacteria and some Gram-negative bacteria. Neutral red is an indicator of the pH. After 24 hours incubation at 30°C (coliforms) or 44°C (thermotolerant coliforms) target bacteria forms on dishes typical pink-red colonies (lactose-positive) with a diameter equal to or exceeding 0.5 mm or more, with or without a zone of bile precipitation. Bio-Rad VRBL is available as ready-to-use bottles or as dehydrated powder.


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VRBL (Violet Red Bile Lactose) Agar – terreno selettivo per il conteggio dei coliformi negli alimenti a norma ISO4832
  • Brand: Bio-Rad
  • Format: 6 x 200 ml
  • Code: BR3554798
  • Technology: Culture media and ISO confirmation tests
  • Application: Food/Water microbiology
  • Tag/Filter: Escherichia coli and coliforms


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