Violet Red Bile Agar. M Violet Red Bile Agar is selective medium used for the isolation, detection and enumeration of coli-aerogenes bacteria in water, milk. Violet Red Bile Agar (VRB Agar). APHA / COMPF / IDF-FIL / ISO Medium for the detection and enumeration of coliforms in milk and other dairy products. Violet Red Bile Agar is used for the enumeration of coliforms in food and the presumptive test for coliforms uses Violet Red Bile Agar, (VRBA).

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Non-lactose-fermenting microorganisms result in colorless colonies.

Using a sterile spreader device, distribute the inoculum evenly over the agar surface. Place a 1ml inoculation into a sterile petri plate. Colonies of Enterobacter aerogenes often appear mucoid and pinkish in color. Alternatively, a covered, boiling waterbath degrees C.

Aseptically inoculate agar surface with 0. The medium is recommended for use in the microbiological analysis of milk and other dairy products, and for use in the examination of water. U Violet Red Bile Agar, 8oz. Standard microbiological supplies and equipment such as loops, slides, staining supplies, Lauryl Sulfate Broth, other culture media, microscopes, incinerators, and incubators, etc. This product is not intended to be used for the diagnosis of human disease.


Spread the dilution evenly over the surface of the medium. Heat in waterbath until melted.

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Violet Red Bile Agar is a selective medium used to detect and enumerate lactose-fermenting coliform microorganisms. Consult listed references for information concerning inoculation procedures. The medium contains bile salts and crystal violet which serve as inhibitory agents toward some gram-positive microorganisms, especially staphylococci.

Hardy Diagnostics Violet Red Bile Agar is recommended for the detection of coliforms in food or dairy products. Carefully swirl the plate to mix the inoculum evenly. Prepare decimal dilutions in sterile diluent to obtain CFU per plate.

For melting bottled media: Non-lactose-fermenting microorganisms produce colorless colonies. Lactose-fermenting microorganisms produce pink to red colonies that are generally surrounded by a reddish zone of precipitated bile.

Neutral red is employed as the pH indicator. There should be enough water in the waterbath to reach the media line.

A covered waterbath will help to reach and maintain the temperature. Melt agar by placing in a boiling waterbath until liquified. Media should not be used if there are any signs of deterioration shrinking, cracking, or discolorationcontamination, or if the expiration date has passed. Product is light vrrb temperature sensitive; protect from light, excessive heat, moisture, and freezing.

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Experimental Results: Experiment 4

Growth; pink to red colonies, may have a slight precipitate around colonies colonies. Violet Red Bile Agar contains a low concentration of bile salts, and therefore is not completely specific for enterics.

Enterococci may grow, and if so, usually appear pinpoint in size vrv rose colored. Lactose-fermenting microorganisms, including coliforms, produce pink to red colonies that are generally surrounded by a reddish zone of precipitated bile.

Violet Red Bile Agar (VRB Agar)

Consult listed references for information on sample collection. Allow medium to warm to room temperature prior to inoculation.

Surface colonies of Escherichia coli appear as entire-edged colonies, while deep colonies appear lens-shaped. American Public Health Association.