Back آغار ماكونكي Arabic Agar MacConkey Catalan MacConkeyův agar Czech MacConkey-Agar German Agar MacConkey Spanish MacConkey agar Basque مک‌کانکی آگار Persian Gélose MacConkey French אגר מקונקי HE Mac Conkey Agar ID

MacConkey agar

Plate with an active bacterial culture
With an active bacterial culture
Lactose
The organism on the left is a lactose fermenter, as evidenced by the pink color. The organism on the right produced no color, so it does not appear to be a lactose fermenter.

MacConkey agar is a selective and differential culture medium for bacteria. It is designed to selectively isolate gram-negative and enteric (normally found in the intestinal tract) bacteria and differentiate them based on lactose fermentation.[1] Lactose fermenters turn red or pink on MacConkey agar, and nonfermenters do not change color. The media inhibits growth of gram-positive organisms with crystal violet and bile salts, allowing for the selection and isolation of gram-negative bacteria. The media detects lactose fermentation by enteric bacteria with the pH indicator neutral red.[2]

  1. ^ "MacConkey Agar". Texas Medical Center. Archived from the original on 2008-11-04.
  2. ^ Anderson, Cindy (2013). Great Adventures in the Microbiology Laboratory (7th ed.). Pearson. pp. 175–176. ISBN 978-1-269-39068-2.
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