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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Melt agar by placing in a boiling waterbath until liquified. For melting bottled media: This product is not intended to be used for the diagnosis of human disease. Non-lactose-fermenting microorganisms result in colorless colonies.

Media should not be used if there are any signs of deterioration shrinking, cracking, or discolorationcontamination, or if the expiration date has passed. Non-lactose-fermenting microorganisms produce colorless colonies. Alternatively, a covered, boiling waterbath aagr C.

Hardy Diagnostics Violet Red Bile Agar is recommended for vtb detection of coliforms in food or dairy products. Violet Red Bile Agar is a selective medium used to detect and enumerate lactose-fermenting coliform microorganisms.


Surface colonies of Escherichia coli appear as entire-edged colonies, while deep colonies appear lens-shaped. Violet Red Bile Agar contains a low concentration of bile salts, and therefore is not completely specific for enterics. Allow medium to warm to room temperature prior to inoculation. Using a sterile spreader device, agaar the inoculum evenly over the agar surface.

Carefully swirl the plate to mix the inoculum evenly.

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Product is light and temperature sensitive; protect from light, excessive heat, moisture, and freezing. Consult listed references for information on sample agzr. Lactose-fermenting microorganisms produce pink to red colonies that are generally surrounded by a reddish zone of precipitated bile.

There should be enough water in the waterbath to reach the media line. Standard microbiological supplies and equipment such as loops, slides, staining supplies, Lauryl Sulfate Broth, other culture media, microscopes, incinerators, and incubators, etc. The medium abar 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.

Violet Red Bile Agar (VRB Agar)

Enterococci may grow, and if so, usually appear pinpoint in size and rose colored. Aseptically inoculate agar surface with 0. Lactose-fermenting microorganisms, including coliforms, produce pink to red colonies that are generally surrounded by a reddish zone of precipitated bile. Place a 1ml inoculation into a sterile petri plate. The medium contains bile salts and crystal violet which serve as inhibitory agents toward some gram-positive microorganisms, especially staphylococci.


Colonies of Enterobacter aerogenes often appear mucoid and pinkish in color. Growth; pink to red colonies, may have a slight precipitate around colonies colonies. Consult listed references for information concerning inoculation avar.

Heat in waterbath until melted. American Public Health Association. Spread the dilution evenly over the surface of the medium.

Violet Red Bile Agar (VRBA) – Lab M

Neutral red is employed as the pH indicator. A covered waterbath will help vdb reach and maintain the temperature. Prepare decimal dilutions in sterile diluent to obtain CFU per plate.