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Drigalski Lactose Agar
Drigalski Lactose agar is used for the selective isolation of Enterobacteriaceae. It allows the differentiation of bacteria according to their ability to ferment lactose in food, pharmaceutical, cosmetic and veterinary samples.
Available as dehydrated medium 500 g bottle
In compliance with regulatory requirements, a USDA permit (VS 16-3) is mandatory for shipments from Canada to the USA due to the inclusion of peptone, an animal byproduct.
The development of Gram positive bacteria is inhibited by crystal violet and sodium desoxycholate.
The fermentation of lactose is demonstrated by acid production that leads to a color change to yellow of the bromothymol blue indicator.
This media only partially inhibits the invasion by Proteus. In the event that Proteus contamination is suspected, it is possible to place 1 to 2 drops of alcohol in the cover of the Petri plate just prior to inoculation. The alcohol vapors limit invasion, without limiting the culture of the Enterobacteriaceae.
