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MRS Agar
MRS Agar is used for the growth and enumeration of cultures of Lactobacillus in dairy and other food products as well as in products destined for animal feed.
The medium can be used to culture slow-growing lactobacilli such as Lactobacillus brevis and Lactobacillus fermentum. Acidified to low pH, it can be used to enumerate Lactobacillus bulgaricus in yogurts.
According to the bacteria sought, the media can be adjusted in pH to obtain optimal growth.
The typical composition responds to that described in the standard ISO 15214.
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 different peptones, glucose, magnesium and manganese salts supply the nutritive elements required for the growth of lactobacilli.
Tween 80 is composed of a mixture of oleic esters and is a source of fatty acids essential for the growth of these bacteria.
Dipotassium phosphate stabilizes the pH during bacterial growth.
Ammonium citrate and sodium acetate inhibit the development of most contaminants, including streptococci and molds.
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