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Thermo Scientific™ MacConkey Agar Base (Dehydrated)

Catalog No. R453812
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R453812 500 g
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Description

Selectively cultivate gram-negative bacilli with MacConkey Agar Base.

Selectively cultivate gram-negative bacilli with Thermo Scientific™ Remel™ MacConkey Agar Base (Dehydrated). In 1900, MacConkey first described a neutral red bile salt medium for cultivation and identification of enteric organisms1. A detailed description of the selective and differential properties of the medium was published in 19052. Over the years, MacConkey's original formula has been modified - the agar content has been reduced, the concentration of bile salts and neutral red has been adjusted, and sodium chloride has been added3.

Selectively cultivate gram-negative bacilli with MacConkey Agar Base.

  • Selective: Crystal violet and bile salts are selective agents which inhibit most gram-positive organisms.
  • Ease of differentiation: Neutral red is an indicator which turns colonies pink when the carbohydrate is fermented.

This medium contains peptones that provide nitrogenous nutrients and amino acids essential for bacterial growth. Bile salts and crystal violet are selective agents which inhibit gram-positive organisms. MacConkey Agar Base is used with added carbohydrate to differentiate enteric gram-negative bacilli based on fermentation reactions. When the carbohydrate is fermented, a local pH drop around the colony causes bile precipitation in the agar around the colony. Agar is a solidifying agent.

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Remel™ and Oxoid™ products are now part of the Thermo Scientific brand.

TRUSTED_SUSTAINABILITY

Specifications

Description MacConkey Agar Base
Form Powder
Product Type Agar
Quantity 500 g

For Laboratory Use Only

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