Tryptophan Medium Himedia 500g

About Tryptophan Medium Himedia 500g

• Purpose: Detects indole production, a key feature in differentiating bacterial species (e.g., coliforms).
• Appearance (Powder): Cream to yellow, free-flowing, homogeneous powder, sometimes with a slight greenish tinge.
• Appearance (Prepared): Clear, light yellow solution.
• pH: ~7.5 0.2 (for a 1.6% w/v solution).
• Principle: Microorganisms possessing the enzyme tryptophanase hydrolyze tryptophan; indole is detected by adding Kovac's or Ehrlich's reagent, forming a red color.
• Variations: Includes HiVeg versions (using vegetable peptones for BSE/TSE safety) and formulations for specific standards (like ISO). 

1. Growth: Bacteria grow in the medium, utilizing nutrients and the tryptophan.
2. Enzymatic Action: If the organism has tryptophanase, it breaks down tryptophan to produce indole.
3. Detection: Kovac's reagent is added, reacting with indole to form a red layer, indicating a positive test.