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M 17 Agar
M17 Agar is used for the enumeration of lactococci (especially Lactococcus lactis) in dairy products. It is also used to study the sensitivity of these species to bacteriophages. It is well adapted to the enumeration of Streptococcus thermophiles in natural or flavored yogurts, textured or not, and in yogurts containing morsels of fruit.
The typical composition corresponds to that defined in the standards FIL-IDF 149A and ISO 7889.
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.
Casein, meat and soybean peptones contain the carbon and nitrogen sources required to cultivate lactococci.
Yeast extract is a source of B vitamins
Ascorbic acid stimulates growth.
Lactose is fermented to lactic acid, which is buffered by glycerophosphate, in order to stabilize the pH of the media