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Endo Agar
Endo Agar is used for the confirmation of the presence of coliforms and/or thermotolerant coliforms in drinking water, in milk, in dairy products and in other foods.
Available in 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 selectivity of Endo Agar is due primarily to the simultaneous presence of sodium sulfite and basic fuchsin which inhibit contaminating Gram-positive bacteria.
In this medium, where basic fuchsin has been decolored by sodium sulfite, the organisms that do no ferment lactose give rise to colorless and shiny colonies, while coliforms form red colonies. This color is due to acetaldehyde produced which reacts with sulfited fuchsin to release fuchsin. The reaction is so intense in the case of Escherichia coli that it imparts an iridescent green sheen to the colonies.
