How does m-Endo medium work?

Document ID

Document ID TE1002

Published Date

Published Date 27/05/2017
Question
How does m-Endo medium work?
Summary
Coliforms react with medium to produce dark red colonies with a greenish-gold sheen.
Answer
Coliforms ferment lactose in medium and produce an acid-aldehyde complex. This complex combines with Schiff's reagent (also in the medium) to form an iridescent green coating over the colonies. When magnified 10 to 15 times, coliforms appear as dark red colonies with a greenish-gold sheen.