Thermo Scientific™ Oxoid™ Lysine Decarboxylase Broth Tablets (Taylor Modification) (Dehydrated), 5 × 20 Tablets

The Thermo Scientific™ Oxoid™ Lysine Decarboxylase Broth Tablets (Taylor Modification) is a diagnostic culture medium designed for the detection of lysine decarboxylase activity in members of the Enterobacteriaceae family, including Salmonella spp. This medium plays a critical role in biochemical identification and differentiation of enteric bacteria, supporting clinical, food, and environmental microbiology laboratories.

Based on Taylor’s modification, this formulation improves upon earlier methods by eliminating peptone, thereby reducing false-positive reactions associated with organisms such as Citrobacter freundii. The result is a more reliable and accurate test medium for routine diagnostic workflows.

The convenient tablet format ensures ease of preparation, consistent composition, and reduced preparation errors, making it ideal for laboratories requiring standardized and reproducible biochemical testing.

Key Features

• Designed for detection of lysine decarboxylase enzyme activity
• Based on Taylor’s modification for improved specificity and reduced false positives
• Eliminates interference from Citrobacter freundii and related organisms
• Clear colorimetric reaction for easy interpretation (yellow to purple transition)
• Suitable for Enterobacteriaceae identification, including Salmonella spp.
• Convenient tablet format for consistent preparation and ease of use
• Does not require strict anaerobic conditions, simplifying workflow
• Manufactured by Thermo Scientific™ Oxoid™, a trusted microbiology brand

Applications

• Biochemical identification of Enterobacteriaceae
• Detection of lysine decarboxylase activity in bacterial isolates
• Clinical microbiology diagnostics
• Food microbiology pathogen identification
• Environmental microbiology testing
• Teaching and research laboratories for bacterial metabolism studies

Principle of the Method

The test is based on glucose fermentation and lysine decarboxylation:

1. Initial Stage:
   • Bacterial fermentation of glucose produces acid
   • The medium turns yellow (acidic pH)
2. Decarboxylation Stage (Positive Reaction):
   • Lysine is decarboxylated to cadaverine
   • Alkaline conditions are restored
   • The medium changes to purple (positive result)
3. Negative Reaction:
   • No decarboxylation occurs
   • The medium remains yellow

This clear color transition allows rapid and reliable differentiation of bacterial species.

Technical Specifications

Advantages

The Thermo Scientific™ Oxoid™ Lysine Decarboxylase Broth Tablets provide enhanced diagnostic accuracy through Taylor’s improved formulation, minimizing false-positive results. The tablet format ensures consistent preparation, reduces handling errors, and improves laboratory efficiency.

Its clear and distinct color change simplifies interpretation, making it suitable for both routine diagnostics and teaching environments. Additionally, the medium’s ease of use without strict anaerobic requirements enhances workflow flexibility in busy laboratories.

The Thermo Scientific™ Oxoid™ Lysine Decarboxylase Broth Tablets (Taylor Modification) is a reliable and high-performance diagnostic medium for the detection of lysine decarboxylase activity in Enterobacteriaceae. With improved specificity, user-friendly format, and consistent results, it is an essential tool for laboratories focused on accurate bacterial identification and microbiological quality control.