VIOLET RED BILE LACTOSE AGAR

Violet Red Lactose Bile Agar, a modification of MacConkeys original formulation is used for the enumeration of coli-aerogenes bacterial group. It relies on the use of the selective inhibitory components crystals violet and bile salts and the indicator system lactose, and neutral red. Thus, the growth of many unwanted organisms is suppressed, while tentative identification of sought bacteria can be made. Organisms, which rapidly attack lactose, produce pinkish red colonies surrounded by purple halos. Non-fermenters produce colourless to orangish yellow. Whereas, late lactose-fermenters produce pink to pale pink colonies. It is recommended by the ISO committee and the composition & performance criteria of this medium are as per the specifications laid down in ISO 4832:2006.

for detection and enumeration of coliform bacteria in food, water and dairy products