Endo agar
[Image:Endo-Agar.jpg|thumb|Endo agar]
Endo agar is a microbiological growth medium with a faint pink colour. Originally developed for the isolation of Salmonella typhi, it is now used mostly as a coliform medium. Most gram-negative organisms grow well in this medium, while growth of gram-positive organisms is inhibited. Coliform organisms ferment the lactose in this medium, producing a green metallic sheen, whereas non-lactose-fermenting organisms produce clear, colourless colonies, i.e. Salmonella species.
Typical composition
Endo agar typically contains :- 1.0 % peptone
- 0.25 % dipotassium hydrogen phosphate
- 1.0 % lactose
- 0.33 % anhydrous sodium sulfite
- 0.03 % fuchsine
- 1.25 % agar