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Oxoid™ Violet Red Bile Agar

Detect and enumerate coliform organisms in water, food and dairy products with this selective medium.

Detect and enumerate coliform organisms in water, food and dairy products with Thermo Scientific™ Oxoid™ Violet Red Bile Agar (Dehydrated). This lactose containing selective medium has been used for the determination of the coli-aerogenes content of water, milk and other dairy products, dairy equipment, and food products1,2. Due to the addition of selective inhibitory components, neutral red, crystal violet, and bile salts, the medium provides selectivity against non-target Gram-positive bacteria.

Use Violet Red Bile Agar for examination of food, animal feed, and environmental samples for the presence of indicator groups such as coliforms. Besides safety, indicator groups provide a measure of food quality and spoilage potential. One of the most common groups of bacteria employed as indicator organisms by the food industry are the coliforms, which can be regarded as a subgroup within the Enterobacteriaceae.

-Easy-to-read: organisms rapidly fermenting the lactose (coliforms) form red-purple colonies with red-purple halos; while late lactose fermenters form pale colonies with greenish halos.

-Selective: crystal violet and bile salts suppress the growth of non-target Gram-positive bacteria.

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 Violet Red Bile Agar was suitable for determining the coli-aerogenes content of milk.

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Remel™ and Oxoid™ products are now part of the Thermo Scientific brand.