MacConkey Agar – Selective Medium for Gram-Negative Bacteria

What is MacConkey Agar?

This microbiological growth medium is widely used to isolate and differentiate Gram-negative bacteria, particularly members of the Enterobacteriaceae family. Bile salts and crystal violet inhibit Gram-positive growth, while lactose and neutral red allow easy identification of lactose-fermenting bacteria.

Why Use This Medium?

It is essential for testing water, food, clinical, and environmental samples. The medium helps identify organisms such as E. coli, Salmonella, and Shigella. Lactose fermenters form pink or red colonies, while non-fermenters appear colorless, making results clear and reliable.

Features & Benefits

• Selective for Gram-negative organisms
• Differentiates lactose fermenters from non-fermenters
• Suitable for clinical, food, and environmental testing
• Ready-to-use or dehydrated formats available
• Meets international microbiological standards

Applications

• Clinical and diagnostic laboratories
• Water and environmental quality testing
• Food and beverage contamination analysis
• Academic and research microbiology labs

Purchase in Bangladesh

Labtex Bangladesh (Labtexbd.com) offers high-quality, reliable microbiology media. Perfect for professional labs and research institutes, our products ensure consistent results and compliance with international standards.