Principle of MacConkey’s Agar II Microbiology II Media principle

MacConkeys agar Media Principle

It is a selective and differential media. It is selective for enteric bacteria and differentiates between lactose fermenters and lactose non-fermenters. Organisms that can break lactose produce acidic end products which give pink coloured colonies due to neutral red indicator. Lactose non-fermenters cannot break down lactose and no acidic products are formed, thus colourless colonies are formed.

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