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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Enterococci may grow, and if so, usually appear pinpoint in size and rose colored. Heat in waterbath until melted.

Alternatively, a covered, boiling waterbath degrees C. Hardy Diagnostics Violet Red Bile Agar is recommended for the 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. Lactose-fermenting microorganisms, including coliforms, produce pink agarr red colonies that are generally surrounded by a reddish zone of precipitated bile. Aseptically inoculate agar surface with 0. Consult listed references for information concerning inoculation procedures. Standard microbiological supplies and equipment such as loops, slides, staining supplies, Lauryl Sulfate Broth, other culture media, microscopes, incinerators, and incubators, etc.


Violet Red Bile Agar (VRB Agar) – Products – Scharlab,S.L. The Lab Sourcing Group

For melting bottled media: A covered waterbath will help to reach and maintain the vrh. This product is not intended to be used for the diagnosis of human disease. U Violet Red Bile Agar, 8oz.

American Public Health Association. Lactose-fermenting microorganisms produce pink to red colonies that are generally surrounded by a reddish zone of precipitated bile. Using a sterile spreader device, distribute the inoculum evenly over the agar surface. Carefully swirl the plate to mix the inoculum evenly. crb

There should be enough water in the waterbath to reach the media line. Growth; pink to red colonies, may have a slight precipitate around colonies colonies. Product is light and temperature sensitive; protect from light, excessive heat, moisture, and freezing. Consult listed references for information on sample collection.

The medium contains bile salts and crystal violet which serve as inhibitory agents toward some gram-positive microorganisms, especially staphylococci. Violet Red Bile Agar contains a low concentration of bile salts, and therefore is not completely specific for enterics. Melt agar by placing in a boiling waterbath until liquified.


Spread the dilution evenly over the surface of the medium. Non-lactose-fermenting microorganisms result in colorless colonies.

Neutral red is employed as the pH indicator. Colonies of Enterobacter aerogenes often appear mucoid and pinkish in color.

Prepare decimal dilutions in sterile diluent to obtain CFU per plate. Media should not be used if there are any signs of deterioration shrinking, cracking, or discolorationcontamination, or if the expiration date has passed. Surface colonies of Escherichia coli appear as entire-edged colonies, while deep colonies appear lens-shaped.

Violet Red Bile Agar (VRBA) -Lab M

Non-lactose-fermenting microorganisms produce colorless colonies. The medium is recommended for use in the microbiological analysis of milk and other dairy products, and for use in the examination of water. Allow medium to warm to room temperature prior to inoculation. Place a 1ml inoculation into a sterile petri plate.