Zayo-Sigma MacConkey Agar is a selective and differential culture medium used for the isolation and differentiation of Gram-negative enteric bacteria based on lactose fermentation. It is widely utilized in clinical, food, water, and pharmaceutical microbiology laboratories for routine diagnostic and research purposes.

Principle

MacConkey Agar contains bile salts and crystal violet, which inhibit the growth of most Gram-positive organisms, thereby selecting for Gram-negative bacteria. Lactose is included as a fermentable carbohydrate, and neutral red serves as a pH indicator.

Lactose fermenters produce pink to red colonies due to acid production.

Non-lactose fermenters remain colorless or pale.

This differentiation makes it especially useful in the identification of organisms such as Escherichia coli, Klebsiella spp., and Salmonella spp.

Key Features

Selective for Gram-negative organisms

Differential for lactose fermentation

Consistent performance and reliable colony morphology

Suitable for routine microbiological diagnostics

Quality-controlled for laboratory use

Applications

Clinical diagnostic laboratories

Food and water testing laboratories

Pharmaceutical microbiology

Academic and research institutions

Public health laboratories

Available as:

Dehydrated powder (for laboratory preparation)

Ready-to-use prepared plates (depending on SKU)

Storage & Handling

Store in a cool, dry place away from direct light.

Prepared media should be stored at 2–8°C.For in vitro diagnostic and laboratory use only.

For institutional pricing, bulk supply, and guaranteed product availability across Nigeria, contact Medixab today.