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You are here:Home » Culture Media » Media-Microbiological » Violet Red Bile (Lactose) Agar (Powder)

Violet Red Bile (Lactose) Agar (Powder)


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A standard methods, lactose-containing selective medium for selective detection of Coliform in water, dairy products and other food materials. The medium has been used for the determination of the coli-aerogenes content of water, milk and other dairy products, dairy equipment, and food products etc 1,2. Organisms which rapidly attack lactose produce purple colonies surrounded by purple haloes. Non-lactose or late-lactose fermenters produce pale colonies with greenish zones. Other related Gram-negative bacteria may grow but can be suppressed by incubation at >42°C or by anaerobic incubation. Druce et al.3 found that Violet Red Bile Lactose Agar was as good an indicator of coli-aerogenes bacteria in milk as MacConkey Broth, and that the medium was suitable for determining the coli-aerogenes content of milk.
Catalog #V2123
Appearance Dehydrated Medium Straw-pink colored, free-flowing powder.
Prepared medium: Dark purple colored gel
Storage conditions and Shelf Life Store the dehydrated medium at 10-30°C. Store the prepared medium at 2-8°C and use as freshly as possible.
Important NoteThis product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.

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